Artykuły w czasopismach: „Regular season competition”

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Anderson, Travis, Erin B. Wasserman i Sandra J. Shultz. "Anterior Cruciate Ligament Injury Risk by Season Period and Competition Segment: An Analysis of National Collegiate Athletic Association Injury Surveillance Data". Journal of Athletic Training 54, nr 7 (1.07.2019): 787–95. http://dx.doi.org/10.4085/1062-6050-501-17.

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Context Although fatigue has been implicated in anterior cruciate ligament (ACL) injury, few researchers have examined the timing of injury across a competitive sport season or within a competitive session to gain insight into the potential effects of fatigue on the incidence of ACL injury. Objective To identify the time segments across a competitive season or within an individual competition associated with the greatest ACL injury incidence. Design Descriptive epidemiology study. Methods Data from the National Collegiate Athletic Association Injury Surveillance Program for 2004–2005 through 2015–2016 for basketball, lacrosse, and soccer were analyzed. Incidence rate ratios (IRRs) compared ACL injury rates by sport, sex, season segment, and competition period. Poisson regression was used to examine the associations between each of these categories and the incidence of ACL injury as well as interaction effects. Results During the early regular season, the incidence rate was elevated relative to the preseason (IRR = 1.86; 95% confidence interval [CI] = 1.27, 2.74), middle regular season (IRR = 1.48; 95% CI = 1.01, 2.15), late regular season (IRR = 1.56; 95% CI = 1.08, 2.27), and postseason (IRR = 2.20; 95% CI = 1.06, 4.56). A sport-by-season interaction indicated this effect was largely attributable to a higher incidence in the early season among lacrosse athletes. An interaction between season segment and competition period (P = .02) revealed a greater injury incidence before halftime in the early regular season (IRR = 0.38, 95% CI = 0.19, 0.76), but a greater incidence after halftime in the late regular season (IRR = 2.40, 95% CI = 1.15, 5.02). Fewer noncontact injuries occurred in soccer than in basketball or lacrosse. Conclusions The ACL injury incidence was higher in the early part of the regular season, particularly among lacrosse athletes. Although the injury incidences before and after halftime were similar, further analyses of player time and time of injury within each half are necessary. Coaches and practitioners should be cognizant of the elevated injury incidence during the early season among lacrosse athletes. Future authors should consider more specific analyses to further elucidate the potential role of fatigue development in exacerbating the incidence of ACL injury in collegiate athletes both within games and across the season.

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Šíma, Jan, i Jan Procházka. "Analysis of the Polish Highest Football League Competition System". Sport i Turystyka. Środkowoeuropejskie Czasopismo Naukowe 3, nr 1 (2020): 133–43. http://dx.doi.org/10.16926/sit.2020.03.08.

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The paper is focused on analysing the competition system of the highest Polish football league, in particular the championship part after the main competition, introduced in the season 2013/2014 and modified in the season 2017/2018. It is a study of the changes in the rankings after the regular part of the season, both in the group playing for the title and in the relegation group. It simulates a hypothetical situation as if the system had not been changed for the 2017/2018 and 2018/2019 seasons and the situation as if the current system had been played since the 2013/2014 season. In both cases, the results do not show huge variations, which so far challenges the needs for the 2017 modifications. In the long term, we can see a trend of higher variation of standings in the championship part after the main competition rather than in the relegation group. However, there are no major variations regarding the last two positions meaning relegation. In the six analysed seasons, the standings varied only in the seasons 2015/2016 and 2016/2017 – when only one team moved regarding the relegation positions in both cases. The standing of the championship group teams varies much less; although only in two out of six analysed seasons, the regular season winning team have kept their positions and became the final champions.

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Fowler, Peter, Rob Duffield, Adam Waterson i Joanna Vaile. "Effects of Regular Away Travel on Training Loads, Recovery, and Injury Rates in Professional Australian Soccer Players". International Journal of Sports Physiology and Performance 10, nr 5 (lipiec 2015): 546–52. http://dx.doi.org/10.1123/ijspp.2014-0266.

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The current study examined the acute and longitudinal effects of regular away travel on training load (TL), player wellness, and injury surrounding competitive football (soccer) matches. Eighteen male professional football players, representing a team competing in the highest national competition in Australia, volunteered to participate in the study. Training loads, player wellness and injury incidence, rate, severity, and type, together with the activity at the time of injury, were recorded on the day before, the day of, and for 4 d after each of the 27 matches of the 2012−13 season. This included 14 home and 13 away matches, further subdivided based on the midpoint of the season into early (1−13) and late competition (14−27) phases. While TLs were significantly greater on day 3 at home compared with away during the early competition phase (P = .03), no other significant effects of match location were identified (P > .05). Total TL and mean wellness over the 6 d surrounding matches and TL on day 3 were significantly reduced during the late compared with the early competition phase at home and away (P < .05). Although not significantly (P > .05), training missed due to injury was 60% and 50% greater during the late than during the early competition phase at home and away, respectively. In conclusion, no significant interactions between match location and competition phase were evident during the late competition phase, which suggests that away travel had negligible cumulative effects on the reduction in player wellness in the latter half of the season.

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Cabarkapa, Dimitrije, Michael A. Deane, Andrew C. Fry, Grant T. Jones, Damjana V. Cabarkapa, Nicolas M. Philipp i Daniel Yu. "Game statistics that discriminate winning and losing at the NBA level of basketball competition". PLOS ONE 17, nr 8 (19.08.2022): e0273427. http://dx.doi.org/10.1371/journal.pone.0273427.

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The purpose of the present study was to examine differences in game-related statistical parameters between National Basketball Association (NBA) regular and post-season competitive periods and to determine which variables have the greatest contribution in discriminating between winning and losing game outcomes. The data scraping technique was used to obtain publicly available NBA game-related statistics over a three-year span (2016–2019). The total number of games examined in the present investigation was 3933 (3690 regular season and 243 post-season games). Despite small to moderate effect sizes, the findings suggest that NBA teams’ style of play (i.e., tactical strategies) changes when transitioning from the regular to post-season competitive period. It becomes more conservative (i.e., fewer field goal attempts, assists, steals, turnovers, and points scored), most likely due to greater defensive pressure. Discriminant function analysis correctly classified winning and losing game outcomes during the regular and post-season competitive periods in 82.8% and 87.2% of cases, respectively. Two key game-related statistics capable of discriminating between winning and losing game outcomes were field goal percentage and defensive rebounding, accounting for 13.6% and 14.2% of the total percentage of explained variance during the regular season and 11.5% and 14.7% during post-season competitive periods. Also, overall shooting efficiency (i.e., free-throw, 2-point, and 3-point combined) accounted for 23–26% of the total percentage of explained variance.

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Wells, Adam J., Jay R. Hoffman, Kyle S. Beyer, Mattan W. Hoffman, Adam R. Jajtner, David H. Fukuda i Jeffrey R. Stout. "Regular- and postseason comparisons of playing time and measures of running performance in NCAA Division I women soccer players". Applied Physiology, Nutrition, and Metabolism 40, nr 9 (wrzesień 2015): 907–17. http://dx.doi.org/10.1139/apnm-2014-0560.

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The management of playing time in National Collegiate Athletic Association (NCAA) soccer athletes may be a key factor affecting running performance during competition. This study compared playing time and running performance between regular-season and postseason competitions during a competitive women’s soccer season. Nine NCAA Division I women soccer players (age, 21.3 ± 0.9 years; height, 170.3 ± 5.7 cm; body mass, 64.0 ± 5.8 kg) were tracked using portable GPS devices across 21 games during a competitive season (regular season (n = 17); postseason (n = 4)). Movements on the field were divided into operationally distinct thresholds defined as standing/transient motion, walking, jogging, low-speed running, moderate-speed running, high-speed running, sprinting, low-intensity running, and high-intensity running. A significant increase in minutes played (+17%, p = 0.010) was observed at postseason compared with the regular season. Concomitant increases in time spent engaged in low-intensity running (LIR: +18%, p = 0.011), standing/transient motion (+35%, p = 0.004), walking (+17%, p = 0.022), distance covered while walking (+14%, p = 0.036), and at low intensity (+11%, p = 0.048) were observed. Performance comparisons between the first and second half within games revealed a significant decrease (p ≤ 0.05) in high-speed and high-intensity runs during the second half of the postseason compared with the regular season. Changes in minutes played correlated significantly with changes in absolute time spent engaged in LIR (r = 0.999, p < 0.001), standing/transient motion (r = 0.791, p = 0.011), walking (r = 0.975, p = 0.001), jogging (r = 0.733, p = 0.025), distance covered while walking (r = 0.898, p < 0.001) and low-intensity activity (r = 0.945, p < 0.001). Negative correlations were observed between minutes played and absolute time sprinting (r = −0.698, p = 0.037) and distance covered sprinting (r = −0.689, p = 0.040). Results indicate that additional minutes played during the postseason were primarily performed at lower intensity thresholds, suggesting running performance during postseason competitions may be compromised with greater playing time in intercollegiate women’s soccer.

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Doeven, Steven H., Michel S. Brink, Barbara C. H. Huijgen, Johan de Jong i Koen A. P. M. Lemmink. "Managing Load to Optimize Well-Being and Recovery During Short-Term Match Congestion in Elite Basketball". International Journal of Sports Physiology and Performance 16, nr 1 (1.01.2021): 45–50. http://dx.doi.org/10.1123/ijspp.2019-0916.

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In elite basketball, players are exposed to intensified competition periods when participating in both national and international competitions. How coaches manage training between matches and in reference to match scheduling for a full season is not yet known. Purpose: First, to compare load during short-term match congestion (ie, ≥2-match weeks) with regular competition (ie, 1-match weeks) in elite male professional basketball players. Second, to determine changes in well-being, recovery, neuromuscular performance, and injuries and illnesses between short-term match congestion and regular competition. Methods: Sixteen basketball players (age 24.8 [2.0] y, height 195.8 [7.5] cm, weight 94.8 [14.0] kg, body fat 11.9% [5.0%], VO2max 51.9 [5.3] mL·kg−1·min−1) were monitored during a full season. Session rating of perceived exertion (s-RPE) was obtained, and load was calculated (s-RPE × duration) for each training session or match. Perceived well-being (fatigue, sleep quality, general muscle soreness, stress levels, and mood) and total quality of recovery were assessed each training day. Countermovement jump height was measured, and a list of injuries and illnesses was collected weekly using the adapted Oslo Sports Trauma Research Center Questionnaire on Health Problems. Results: Total load (training sessions and matches; P < .001) and training load (P < .001) were significantly lower for ≥2-match weeks. Significantly higher well-being (P = .01) and less fatigue (P = .001) were found during ≥2-match weeks compared with 1-match weeks. Conclusion: Total load and training load were lower during short-term match congestion compared with regular competition. Furthermore, better well-being and less fatigue were demonstrated within short-term match congestion. This might indicate that coaches tend to overcompensate training load in intensified competition.

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Córdova-Martínez, Alfredo, Alberto Caballero-García, Hugo J. Bello, Daniel Perez-Valdecantos i Enrique Roche. "Effects of Eccentric vs. Concentric Sports on Blood Muscular Damage Markers in Male Professional Players". Biology 11, nr 3 (22.02.2022): 343. http://dx.doi.org/10.3390/biology11030343.

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Background: Repetitive eccentric contractions can lead to higher degree of damage compared to repetitive concentric contractions. However, this type of exercise does not reproduce the real situations during the season in competitive sport disciplines. Methods: We analyzed the pattern of muscle damage blood markers in male professionals from three disciplines: cycling (n = 18), mainly concentric, vs. basketball (n = 12) and volleyball (n = 14), both mainly eccentric. Circulating muscle markers were analyzed in two moments of the regular season: after a 20-day training (no competition) period (T1) and after a 20-day period of high demanding competition (T2). Results: Blood levels of creatine kinase and myoglobin (muscle markers) increased in all groups at T2 compared to T1 as a result of competition intensity. The lower increases were noticed in cyclists at the end of both periods. Testosterone levels decreased at T2 compared to T1 in all disciplines, with lower levels found in cyclists. However, cortisol plasma levels decreased in basketball and volleyball players at T2, but increased significantly in cyclists, suggesting a limited adaptation to the effort. Conclusions: The pattern of circulating muscle markers is different depending of the demanding efforts (training vs. competition) of each particular discipline.

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Chandran, Avinash, Reagan E. Moffit, Alexandra F. DeJong Lempke, Adrian J. Boltz, Andrew S. Alexander, Hannah J. Robison, Zachary Yukio Kerr, Christy L. Collins i Erik A. Wikstrom. "Epidemiology of Lateral Ligament Complex Tears of the Ankle in National Collegiate Athletic Association (NCAA) Sports: 2014-15 Through 2018-19". American Journal of Sports Medicine 51, nr 1 (styczeń 2023): 169–78. http://dx.doi.org/10.1177/03635465221138281.

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Background: Epidemiological studies of lateral ankle sprains in NCAA sports are important in appraising the burden of this injury and informing prevention efforts. Purpose: To describe the epidemiology of lateral ankle sprains in NCAA sports during the 2014-15 through 2018-19 seasons. Study Design: Descriptive epidemiology study. Methods: Injury and exposure information collected within the NCAA Injury Surveillance Program (ISP) were examined. Counts, rates, and proportions of lateral ankle sprains were used to describe injury incidence by sport, event type (practices, competitions), season segment (preseason, regular season, postseason), injury mechanism (player contact, noncontact, and surface contact, injury history (new, recurrent), and time loss (time loss [≥1 day], non–time loss). Injury rate ratios (IRRs) were used to examine differential injury rates, and injury proportion ratios (IPRs) were used to examine differential distributions. Results: A total of 3910 lateral ankle sprains were reported (4.61 per 10,000 athlete exposures) during the study period, and the overall rate was highest in men’s basketball (11.82 per 10,000 athlete exposures). The competition-related injury rate was higher than the practice-related rate (IRR, 3.24; 95% CI, 3.04-3.45), and across season segments, the overall rate was highest in preseason (4.99 per 10,000 athlete exposures). Lateral ankle sprains were most often attributed to player-contact mechanisms in men’s (43.2%) and women’s sports (35.1%), although injuries were more prevalently attributed to player contact in men’s than in women’s sports (IPR, 1.23; 95% CI, 1.13-1.34). Overall, 49.7% of all lateral ankle sprains were time loss injuries. Conclusions: The findings of this study are consistent with previous epidemiological investigations of lateral ankle sprains among NCAA athletes. Results offer additional context on differential injury mechanisms between men’s and women’s sports and on injury risk across the competitive season. Future research may examine the effectiveness of deploying injury prevention programs before the start of a season.

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Silva, Joao Renato. "The soccer season: performance variations and evolutionary trends". PeerJ 10 (5.10.2022): e14082. http://dx.doi.org/10.7717/peerj.14082.

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The physiological demands of soccer challenge the entire spectrum of the response capacity of the biological systems and fitness requirements of the players. In this review we examined variations and evolutionary trends in body composition, neuromuscular and endurance-related parameters, as well as in game-related physical parameters of professional players. Further, we explore aspects relevant for training monitoring and we reference how different training stimulus and situational variables (e.g., competition exposure) affect the physiological and performance parameters of players. Generally, improvements of small magnitude in non- (non-CMJ) and countermovement-based jumps (CMJBased) and in the sprint acceleration (ACCPhase) and maximal velocity phase (MVPhase) are observed from start of preparation phase (PPS) to beginning of competition phase (BCP). A greater magnitude of increases is observed in physiological and endurance performance measures within this period; moderate magnitude in sub-maximal intensity exercise (velocity at fixed blood lactate concentrations; V2–4mmol/l) and large magnitude in VO2max, maximal aerobic speed (MAS) and intense intermittent exercise performance (IE). In the middle of competition phase (MCP), small (CMJBased and ACCPhase), moderate (non-CMJ; MVPhase; VO2max; sub-maximal exercise) and large (MAS and IE) improvements were observed compared to PPS. In the end of competition period (ECP), CMJBased and MVPhase improve to a small extent with non-CMJ, and ACCPhase, VO2max, MAS, sub-maximal intensity exercise and IE revealing moderate increments compared to PPS. Although less investigated, there are generally observed alterations of trivial magnitude in neuromuscular and endurance-related parameters between in-season assessments; only substantial alterations are examined for IE and sub-maximal exercise performance (decrease and increase of small magnitude, respectively) from BCP to MCP and in VO2max and IE (decrements of small magnitude) from MCP to ECP. Match performance may vary during the season. Although, the variability between studies is clear for TD, VHSR and sprint, all the studies observed substantial increments in HSR between MCP and ECP. Finally, studies examining evolutionary trends by means of exercise and competition performance measures suggests of a heightened importance of neuromuscular factors. In conclusion, during the preseason players “recover” body composition profile and neuromuscular and endurance competitive capacity. Within in-season, and more robustly towards ECP, alterations in neuromuscular performance seem to be force-velocity dependent, and in some cases, physiological determinants and endurance performance may be compromised when considering other in-season moments. Importantly, there is a substantial variability in team responses that can be observed during in-season. Consequently, this informs on the need to both provide a regular training stimulus and adequate monitorization throughout the season.

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Lindsay, Angus, John Lewis, Nicholas Gill, Steven P. Gieseg i Nick Draper. "Immunity, inflammatory and psychophysiological stress response during a competition of professional rugby union". Pteridines 26, nr 4 (1.12.2015): 153–60. http://dx.doi.org/10.1515/pterid-2015-0012.

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AbstractNeopterin, cortisol and immunoglobulin A were measured to determine what effect a professional rugby competition has on the immunity, inflammatory and psychophysiological stress response. Urine and saliva were collected from 37 professional players at regular intervals throughout a 20 week professional competition. Total neopterin, cortisol and secretory immunoglobulin A were analysed using enzyme linked immunosorbant assay (ELISA) and high performance liquid chromatography (HPLC). All markers did not change significantly when analysed as a group during the course of the season compared to baseline (p>0.05), although long-distance travel had a minor effect on cortisol and secretory immunoglobulin A concentrations (p<0.05). More importantly, a large inter-individual variation for all markers was observed (p<0.001). These results indicate this competition of professional rugby does not cause significant changes in psychophysiological stress. Some players however, may become more susceptible to fatigue and infection during the course of a season as a result of suppressed immunity and sustained activation of the inflammatory response.

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Ciuberkis, Steponas, Stasys Bernotas, Steponas Raudonius i Joel Felix. "Effect of Weed Emergence Time and Intervals of Weed and Crop Competition on Potato Yield". Weed Technology 21, nr 1 (marzec 2007): 213–18. http://dx.doi.org/10.1614/wt-04-210.1.

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A field study was conducted at Vezaiciai branch of the Lithuanian Institute of Agriculture from 1998 to 2000 to determine weed emergence dynamics in potato and to estimate the effect of different intervals of weed crop competition on potato tuber yield. Treatments varying in intervals of weed-free conditions and competition were laid out in a randomized complete block design with six replications. The greatest emergence of annual broadleaf weeds (62 to 86% of the season total) in the crop was observed in the period from potato planting until flowering. Emergence of winter annuals such as field violet and scentless mayweed was greatest in the period from the 20-cm potato plant height until harvesting. Competition was most detrimental to potato tuber yield in the periods from planting until flowering, from planting until 25 d after flowering, or for the entire growing season. Potato tuber yield decreased by 8.1, 8.4, and 6.4%, respectively, during these competition intervals compared to the weed-free treatment. The results indicated that the critical weed-free period, when weed competition was detrimental to yield, started from planting until 25 d after flowering if regular interrow cultivation was applied.

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Dehesa, Rubén, Alejandro Vaquera, Bruno Gonçalves, Nuno Mateus, Miguel Ángel Gomez-Ruano i Jaime Sampaio. "Key game indicators in NBA players’ performance profiles". Kinesiology 51, nr 1 (2019): 92–101. http://dx.doi.org/10.26582/k.51.1.9.

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The aim of the present study was to identify and describe players’ performances in NBA games using individual and team-based game variables. The sample was composed by 535 balanced games (score differences below or equal to eight points) from the regular season (n=502) and the playoffs (n=33). A total of 472 players were analysed. The individual-based variables were: minutes on court, effective field-goal percentage, free-throws/field-goals ratio, offensive rebound percentage, turnover percentage and playing position. The team-based variables were: team points minus opponent’s points (on and off court), NET score (player’s on values minus his/her off values), maximum negative and positive point difference, team’s winning percentage, game pace, defensive and offensive ratings. A two-step cluster analysis was performed to identify the player’s profiles during regular season and playoff games. The results identified five performance profiles during regular season games and four performance profiles during playoff games. The profiles identified were mainly characterized by the game quarter and the negative NET indicator (players’ performance on court minus their performance off court) in regular season games and the positive NET indicator during playoff games and second and third game-quarters. Coaching staffs can fine-tune these profiles to develop more team-specific models and, conversely, use the results to monitor and rebuild team formation under the constrained dynamics of the game and competition stages.

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McHale, Kevin J., Joshua C. Rozell, Andrew H. Milby, James L. Carey i Brian J. Sennett. "Outcomes of Lisfranc Injuries in the National Football League". American Journal of Sports Medicine 44, nr 7 (10.05.2016): 1810–17. http://dx.doi.org/10.1177/0363546516645082.

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Background: Tarsometatarsal (Lisfranc) joint injuries commonly occur in National Football League (NFL) competition; however, the career effect of these injuries is unknown. Purpose: To define the time to return to competition for NFL players who sustained Lisfranc injuries and to quantify the effect on athletic performance. Study Design: Case-control study; Level of evidence, 3. Methods: Data on NFL players who sustained a Lisfranc injury between 2000 and 2010 were collected for analysis. Outcomes data included time to return to competition, total games played after season of injury, yearly total yards and touchdowns for offensive players, and yearly total tackles, sacks, and interceptions for defensive players. Offensive power ratings ( OPR = [ total yards/10] + [ total touchdowns × 6]) and defensive power ratings ( DPR = total tackles + [ total sacks × 2] + [ total interceptions × 2]) were calculated for the injury season and for 3 seasons before and after the injury season. Offensive and defensive control groups consisted of all players without an identified Lisfranc injury who competed in the 2005 season. Results: The study group was composed of 28 NFL athletes who sustained Lisfranc injuries during the study period, including 11 offensive and 17 defensive players. While 2 of 28 (7.1%) players never returned to the NFL, 26 (92.9%) athletes returned to competition at a median of 11.1 (interquartile range [IQR], 10.3-12.5) months from time of injury and missed a median of 8.5 (IQR, 6.3-13.0) regular-season games. Analysis of pre- and postinjury athletic performance revealed no statistically significant changes after return to sport after Lisfranc injury. The magnitude of change in median OPR and DPR observed in offensive and defensive Lisfranc-injured study groups, −34.8 (IQR, −64.4 to 1.4) and −13.5 (−30.9 to 4.3), respectively, was greater than that observed in offensive and defensive control groups, −18.8 (−52.9 to 31.5) and −5.0 (−22.0 to 14.0), respectively; however, these differences did not reach statistical significance ( P = .33 and .21, respectively). Evaluation of the durability of injured players after the season of injury revealed no statistically significant difference in career length compared with controls. Conclusion: More than 90% of NFL athletes who sustained Lisfranc injuries returned to play in the NFL at a median of 11.1 months from time of injury. Offensive and defensive players experienced a decrease in performance after return from injury that did not reach statistical significance compared with their respective control groups over a similar time period.

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Bigg, Jessica Lynne, Alexander Shand Davis Gamble i Lawrence L. Spriet. "Internal Load of Female Varsity Ice Hockey Players During Training and Games During a Season". International Journal of Sports Medicine 43, nr 04 (12.10.2021): 357–65. http://dx.doi.org/10.1055/a-1555-3484.

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AbstractThis study quantified internal load, using sessional rating of perceived exertion (sRPE) and heart-rate derived training impulse (TRIMP), of female varsity ice hockey players throughout a season. Twenty-four female (19.8±1.4 yr, 68.0±6.9 kg) varsity ice hockey players participated in this prospective cohort study. Internal load was captured using sRPE and TRIMP for each on-ice session. Internal load was significantly higher (p<0.05) for games (sRPE: 324±202 AU, TRIMP: 95±60 AU) compared to training (sRPE: 248±120 AU, TRIMP: 68±32 AU). Overall, goalies had a higher internal load than forwards (sRPE and TRIMP) and defence (TRIMP), with no differences between forwards and defence. Micro-cycle periodization was present, with training sessions several days prior to game days having the highest internal load (sRPE and TRIMP) and tapering down as subsequent training sessions approached game day. For the meso-cycle assessment, for both training and competition combined, the post-season sRPE was greater than the pre-season (p=0.002) and regular season (p<0.001). Lastly, the association between sRPE and TRIMP, revealed a large, statistically significant relationship (r=0.592, p<0.001). Internal load was greater during competitions, training sessions and subsequent internal loads suggested prioritization around game days, the post-season phase demanded the highest internal load and there was a strong correlation between sRPE and TRIMP.

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Christopher, Zachary K., Justin L. Makovicka, Kelly L. Scott, Jeffrey D. Hassebrock, Karan A. Patel, Andrew S. Chung, Sailesh V. Tummala, Thomas C. Hydrick, Jessica Ginn i Anikar Chhabra. "Elbow Injuries in National Collegiate Athletic Association Football Players: An Epidemiological Study Spanning 5 Academic Years". Orthopaedic Journal of Sports Medicine 7, nr 9 (wrzesień 2019): 232596711986741. http://dx.doi.org/10.1177/2325967119867411.

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Background: National Collegiate Athletic Association (NCAA) football players are at a high risk of injuries. Elbow injuries are uncommon, but there are insufficient data specifically on elbow injuries sustained in NCAA football players. Purpose: To define the epidemiology of elbow injuries in NCAA football players during the 2009-2010 to 2013-2014 seasons using data from the NCAA Injury Surveillance Program (NCAA-ISP). Study Design: Descriptive epidemiology study. Methods: Using the NCAA-ISP database, a convenience sample of NCAA football athletes was reviewed to determine the types, rates, and trends in elbow injuries. Several factors were examined, including the diagnosis, injury setting, time lost from sport, surgical necessity, and injury recurrence. Raw injury data were obtained as well as weighted totals from the NCAA-ISP to generate national estimates and adjust for underreporting. Injury rates were calculated by dividing the number of injuries by the total number of athlete-exposures (AEs). The rate ratios of injuries during competition versus practice were compared, as were the rate ratios of preseason, regular-season, and postseason injuries by type. Results: We identified 4874 total elbow injuries from the 2009-2010 to 2013-2014 seasons. The rate of injuries overall was 1.892 per 10,000 AEs. The rate for competition was 9.053 per 10,000 AEs and 1.121 per 10,000 AEs for practice. The rate ratio between competition and practice was 8.08 (95% CI, 6.04-10.80). Injury rates for the preseason, regular season, and postseason were 1.851, 1.936, and 1.406 per 10,000 AEs, respectively. Acute elbow instability was the most common injury type (65.43%). The most common mechanism was a contact injury (86.77%); 96.82% of injuries did not require surgery, and most elbow injuries required less than 24 hours of participation restriction (67.33%). Conclusion: Although elbow injuries in NCAA football players are uncommon, it is important to recognize and treat these injuries appropriately. Dislocations and ulnar collateral ligament injuries caused athletes to miss extended periods of play. Fortunately, a majority of injuries resulted in less than 24 hours of participation restriction. Particular attention should be given to preventing elbow injuries, especially ulnar collateral ligament strains, hyperextension injuries, and acute instability.

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Hautbois, Christopher, i Patrick Bouchet. "Segmenting the spectators of national team sports: the case of a pre-competition match". International Journal of Sports Marketing and Sponsorship 16, nr 4 (1.07.2015): 67–82. http://dx.doi.org/10.1108/ijsms-16-04-2015-b006.

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It has become common for academics and sports marketing professionals to study and explain the heterogeneity and complexity of sports spectators' behaviours and attitudes, with numerous works addressing this topic But these surveys are more about fans of professional sports clubs (soccer, basketball, baseball, hockey, etc) who attend regular season games in their favourite teams' home stadium or arena. To our knowledge, very few studies have been conducted into spectators of national teams. It is these spectators who are of the focus of this paper.

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Brant, V., K. Neckář, J. Pivec, M. Duchoslav, J. Holec, P. Fuksa i V. Venclová. "Competition of some summer catch crops and volunteer cereals in the areas with limited precipitation". Plant, Soil and Environment 55, No. 1 (5.01.2009): 17–24. http://dx.doi.org/10.17221/378-pse.

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Competitive ability of six summer catch crops (Brassica napus, Lolium multiflorum, Lolium perenne, Phacelia tanacetifolia, Sinapis alba and Trifolium incarnatum) in volunteer winter wheat based on field trials was experimentally tested during the years 2004–2007 in central Bohemia (Czech Republic). The production of aboveground biomass and plant cover of sown catch crops, volunteers and weeds was assessed on experimental plots. General linear models revealed significant influence of catch crops, year and their interaction on dry-mass of the volunteers. The lowest average values of volunteer biomass at the end of growing season (average from 2004–2007) were recorded on plots sown with S. alba (124.7 kg/ha) and P. tanacetifolia (186.3 kg/ha). The average biomass of volunteer plants in stands of S. alba was significantly lower than the biomass of volunteers in stands of L. perenne, L. multiflorumand T. incarnatum. The lowest average biomass of weeds was recorded also in S. alba stands. In the context of our study, catch crop is a crop sown between seasons of regular plantings to make use of temporary idleness of the soil.

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Seco-Calvo, Jesús, Juan Mielgo-Ayuso, César Calvo-Lobo i Alfredo Córdova. "Cold Water Immersion as a Strategy for Muscle Recovery in Professional Basketball Players During the Competitive Season". Journal of Sport Rehabilitation 29, nr 3 (1.03.2020): 301–9. http://dx.doi.org/10.1123/jsr.2018-0301.

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Context: Despite prior studies that have addressed the recovery effects of cold-water immersion (CWI) in different sports, there is a lack of knowledge about longitudinal studies across a full season of competition assessing these effects. Objective: To analyze the CWI effects, as a muscle recovery strategy, in professional basketball players throughout a competitive season. Design: A prospective cohort design. Setting: Elite basketball teams. Participants: A total of 28 professional male basketball players divided into 2 groups: CWI (n = 12) and control (n = 16) groups. Main Outcome Measures: Muscle metabolism serum markers were measured during the season in September—T1, November—T2, March—T3, and April—T4. Isokinetic peak torque strength and ratings of perceived exertion were measured at the beginning and at the end of the season. CWI was applied immediately after every match and after every training session before matches. Results: All serum muscular markers, except myoglobin, were higher in the CWI group than the control group (P < .05). The time course of changes in muscle markers over the season also differed between the groups (P < .05). In the CWI group, ratings of perceived exertion decreased significantly from the beginning (T1–T2) to the end (T3–T4). Isokinetic torque differed between groups at the end of the season (60°/s peak torque: P < .001 and ; and 180°/s peak torque: P < .001 and ) and had changed significantly over the season in the CWI group (P < .05). Conclusions: CWI may improve recovery from muscle damage in professional basketball players during a regular season.

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Johnston, W. H., i V. F. Shoemark. "Establishment and persistence of palatable taxa of Eragrostis curvula complex in southern New South Wales". Australian Journal of Experimental Agriculture 37, nr 1 (1997): 55. http://dx.doi.org/10.1071/ea96025.

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Summary. Spring sowings in cultivated plots at Wagga Wagga in 1980 and 1982, and Cowra and Colinroobie in 1980 and 1981 examined the establishment and persistence of Eragrostis curvula (Schrad.) Nees complex cv. Consol and accession 4660, Cenchrus ciliaris L. cv. American and Phalaris aquatica L. cv. Sirocco. Cenchrus ciliaris was short-lived and not frost-hardy. Competition and dry conditions reduced establishment of all species, nevertheless E. curvula established reliably. In 1 experiment where conditions were not immediately favourable for germination, E. curvula demonstrated a capacity to delay establishment until conditions improved. Competition from cool-season plants reduced persistence, particularly in the first year and when conditions were dry. Surviving E. curvula plants were generally long lived. At Cowra, the density of E. curvula was enhanced by regular mowing, but mowing reduced the density of P. aquatica. Presence of Trifolium subterraneum L. reduced the density of E. curvula while P. aquatica was unaffected. A second experiment at Colinroobie, sown in October 1987 examined the effects of mowing and fertiliser application on establishment and persistence of E. curvula cv. Consol and accession 4660. Fertiliser increased competition by cool-season annual species, reducing establishment and persistence of E. curvula, while regular mowing improved its persistence. In an experiment sown at Wagga Wagga in October 1989, E. curvula cv. Consol establishment was very low (<1 plant/m2) in undisturbed annual pasture and in the absence of cultivation, herbicide (glyphosate at 530 g a.i./ha) and mowing with herbage removal provided the best conditions for establishment.

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Gómez, Miguel-Ángel, Ramón Medina, Anthony S. Leicht, Shaoliang Zhang i Alejandro Vaquera. "The Performance Evolution of Match Play Styles in the Spanish Professional Basketball League". Applied Sciences 10, nr 20 (11.10.2020): 7056. http://dx.doi.org/10.3390/app10207056.

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The aim of this study is to analyse the performance evolution of all, and the dominant, team’s performances throughout an eight-season period within the Spanish professional basketball league. Match-related statistics were gathered from all regular season matches (n = 2426) played during the period 2009–2010 to 2016–2017. The non-metric multidimensional scaling model was used to examine the team’s profiles across seasons and for the most successful (playoff) teams. The main results showed that: 3-point field goals made (effect size, d = 0.61; 90% confidence interval, CI = 0.23; 1.37) and missed (d = 0.72; 90% CI = 0.35; 1.46), and assists (d = 1.27; 90% CI = 0.82; 1.86) presented a positive trend with an increased number of actions across the seasons; 2-point field goals made (d = 0.21; 90% CI = −1.25; 2.02) and missed (d = 0.27; 90% CI = −0.52; 0.92) were decreased; free throws made and missed, rebounds, fouls, blocks, steals and turnovers showed a relatively stable performance. The matrix solution (stress = 0.22, rmse (root mean squared error) = 7.9 × 104, maximum residual = 5.8 × 103) indicated minimal season-to-season evolution with the ordination plot and convex hulls overlapping. The two most dominant teams exhibited unique match patterns with the most successful team’s pattern, a potential benchmark for others who exhibited more dynamic evolutions (and less success). The current findings identified the different performances of teams within the Spanish professional basketball league over eight seasons with further statistical modelling of match play performances useful to identify temporal trends and support coaches with training and competition preparations.

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Ward, Russell E. "Rituals, First Impressions, and the Opening Day Home Advantage". Sociology of Sport Journal 15, nr 3 (wrzesień 1998): 279–93. http://dx.doi.org/10.1123/ssj.15.3.279.

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Durkheim’s discussion on ritual and Goffman’s theoretical work on first impressions are used to predict superior performance among home teams on opening day. Information on opening day game outcomes is compiled and compared with the results of regular season and championship play. The analysis reveals a greater home advantage for teams playing in opening day games than for home teams competing in regular season or championship games. When controlling for the effect of stadium attendance on the home advantage, the opening day home advantage exceeds that of championship competition. The results suggest that ritual activity and concerns for first impression management may be factors that condition home team performance, offering support for the assertion that performance is partly a social product. Further home advantage research can direct attention to cross-cultural differences in the opening day home advantage and focus on qualitative data collection to supplement the current abundance of archival data.

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Yang, Fan, i Jun Zhang. "The Ranking Prediction of NBA Playoffs Based on Improved PageRank Algorithm". Complexity 2021 (12.02.2021): 1–10. http://dx.doi.org/10.1155/2021/6641242.

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It is of great significance to predict the results accurately based on the statistics of sports competition for participants research, commercial cooperation, advertising, and gambling profit. Aiming at the phenomenon that the PageRank page sorting algorithm is prone to subject deviation, the category similarity between pages is introduced into the PageRank algorithm. In the PR value calculation formula of the PageRank algorithm, the factor W(u, v) between pages is added to replace the original Nu (the number of links to page u). In this way, the content category between pages is considered, and the shortcoming of theme deviation will be improved. The time feedback factor in the PageRank-time algorithm is used for reference, and the time feedback factor is added to the first improved PR value calculation formula. Based on statistics from 1230 games during the NBA 2018-2019 regular season, this paper ranks the team strength with improved PageRank algorithm and compares the results with the ranking of regular-season points and the result of playoffs. The results show that it is consistent with the regular-season points ranking in the eastern division by the use of improved PageRank algorithm, but there is a difference in the second ranking in the western division. In the prediction of top four in playoffs, it predicts three of the four teams.

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Božović, Branislav, Aleksandar Rajković i Radivoj Mandić. "Shooting distribution and efficiency between basketball ABA league and Euroleague in season 2018/2019". Fizicka kultura 75, nr 2 (2021): 161–68. http://dx.doi.org/10.5937/fizkul75-33833.

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The aim of this research was to determine whether there are differences in the shooting distribution and efficiency between the ABA basketball league and the Euroleague within the 2018/2019 regular part of the season. The research sample was represented by the teams participating in the ABA League (12 teams) and the Euroleague (16 teams) in the 2018/2019 season. The regular part of the season was organized in a two-round league system for both leagues, where 264 games were played within the ABA league, and 480 games in the Euroleague. Based on the results obtained using the T-test for independent samples, it was noticed that there are statistically significant differences in 3 point shots from the central position (p<0.000), 2 point shots from the central position (p<0.000), and within the key (p=0.002), and when it comes to the shooting efficiency, significant differences appear in the 3 point position on the left side (p=0.010) and the right corner (p=0.041), as well as for 2 points inside the key (p=0.001). Analyzing the percentage of shooting efficiency, it is clear that Euroleague teams have a higher quality compared to teams from the ABA league, which is in line with previous research where it is indicated that 2-point shots are one of the most important factors for a team's success in competition. Euroleague teams take most of the shots from the key in relation to other positions, as well as ABA teams, while the level of efficiency is reversed. Considering that in both leagues, the largest number of shots was taken from the key, it can be concluded that the number of shot attempts is a more important factor than efficiency when it comes to success in competition.

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Zhang, Shaoliang, Alberto Lorenzo, Carl T. Woods, Anthony S. Leicht i Miguel-Angel Gómez. "Evolution of game-play characteristics within-season for the National Basketball Association". International Journal of Sports Science & Coaching 14, nr 3 (2.05.2019): 355–62. http://dx.doi.org/10.1177/1747954119847171.

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The aim of this study was to explore the (dis)similarity of game-play characteristics throughout an in-season period within the National Basketball Association. Thirteen performance-related indicators of all 1230 games of the regular 2016–2017 season in the National Basketball Association were analysed. Non-metric multidimensional scaling was used to examine (dis)similarity of team profiles. The two-dimensional multivariate matrix showed that team profiles generally presented similarity, while the beginning and ending of the season (October and April) showed relative dissimilarity. Although each team presented unique paths throughout the in-season period, the dominant teams in the National Basketball Association presented similar game styles. In addition, the game-play of the teams evolved into effective interactions in terms of offence and defence as the competition progressed while presenting an increased trend in the number of three-point field-goals made (p < 0.000, small effect size (η2) = 0.011) throughout the in-season period. The analytics performed in this study could be used practically to evaluate temporal changes of game-play characteristics in basketball as well as inform strategic periodization plans within season periods.

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Mondello, Michael, Brian M. Mills i Scott Tainsky. "Shared Market Competition and Broadcast Viewership in the National Football League". Journal of Sport Management 31, nr 6 (1.11.2017): 562–74. http://dx.doi.org/10.1123/jsm.2016-0222.

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This work evaluates the cross-quality elasticity of related products in the context of Nielsen Local People Meter ratings of all regular season broadcasts from 2010 through 2013 from six National Football League teams in three shared markets. Using a fixed effects panel regression, we do not uncover evidence that viewers are swayed by the success of a rival market team in their aggregate viewership patterns, contrary to what has been found in Major League Baseball. In addition, when within-market rivals play one another, we find that viewership levels increase but in a way that indicates considerable overlap of viewership and possible substitution choices made by consumers. We expand upon the implications of this work for demand estimation in sports economics research as well as the importance of our findings to sport management-related policy.

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Jürgens, Norbert, Priscilla Sichone, Rasmus Revermann, Felicitas Gunter i Jens Oldeland. "Macrotermes natalensis termite colonies in seasonally flooded savannas". Biodiversity & Ecology 7 (13.11.2022): 340–48. http://dx.doi.org/10.7809/b-e.00373.

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In seasonally inundated landscapes of southern central Africa very large termite mounds of Macrotermes natalensis offer a refuge for flood-intolerant trees during the flood season. In the matrix landscape surrounding these islands the seasonally waterlogged and then anaerobic soil conditions and the browsing by megaherbivores during the dry season allow for grass and herbaceous vegetation only. During the rainy season each termitarium forms an isolated island which due to its relative dryness allows survival of the trees and the associated fauna. During the dry season the termites try to establish new colonies with new mounds. However, the successful formation of new termitaria islands seems to be a rare event. In this case study from Dundumwezi in the Kafue National Park, Zambia, we provide a description of the termitaria islands and their vegetation. Furthermore, we analyse spatial patterns of termite mound islands in the surroundings of Kafue National Park und Bangweulu Plains / Kasanka National Park based on remote sensing imagery. Our results confirm that competition among colonies of large termitaria in homogeneous habitats causes very regular spatial patterns.

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Chona, Deepak V., John C. Bonano, Olufemi R. Ayeni i Marc R. Safran. "Definitions of Return to Sport After Hip Arthroscopy: Are We Speaking the Same Language and Are We Measuring the Right Outcome?" Orthopaedic Journal of Sports Medicine 8, nr 9 (1.09.2020): 232596712095299. http://dx.doi.org/10.1177/2325967120952990.

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Background: Return to sport is a commonly studied outcome of hip arthroscopy that is relevant to both patients and providers. There exists substantial variability in criteria used to define successful return to sport. Purpose: To review and evaluate the definitions used in the literature so as to establish a single standard to enable comparison of outcomes in future studies. Study Design: Systematic review; Level of evidence, 4. Methods: The PubMed, MEDLINE, and Embase databases were searched from inception to June 1, 2019, for studies relating to hip arthroscopy and return to sport. Articles included were those that met the following criteria: (1) contained 2 or more patients, (2) studied patients 18 years of age and older, (3) reported postoperative outcomes after hip arthroscopy, (4) clearly defined return to play, and (5) were written in English. Excluded articles (1) reported outcomes for nonoperative or open treatments, (2) did not clearly define return to play, or (3) were review articles, meta-analyses, or survey-based studies. Return-to-play definitions and additional metrics of postoperative performance and outcome were recorded. Results: A total of 185 articles were identified, and 28 articles were included in the final review, of which 18 involved elite athletes and 10 involved recreational athletes. Of articles studying elite athletes, 6 (33%) defined return to play as participation in regular or postseason competition, 3 (17%) extended the criteria to the preseason, and 2 (11%) used participation in sport-related activities and training. The remaining 7 (39%) reported rates of return to the preoperative level of competition but did not specify preseason versus regular season. All 10 articles evaluating recreational athletes defined return to play based on patient-reported outcomes. Four (40%) did so qualitatively, while 6 (60%) did so quantitatively. Conclusion: There exists significant variability in criteria used to define successful return to sport after hip arthroscopy, and these criteria differ among elite and recreational athletes. For elite athletes, return to the preoperative level of competition is most commonly used, but there exists no consensus on what type of competition—regular season, preseason, or training—is most appropriate. For recreational athletes, patient-reported data are most commonly employed, although there are clear differences between authors on the ways in which these are being used as well.

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Ralston, Bridget, Jaymeson Arthur, Justin L. Makovicka, Jeff Hassebrock, Sailesh Tummala, David G. Deckey, Karan Patel, Anikar Chhabra i David Hartigan. "Hip and Groin Injuries in National Collegiate Athletic Association Women’s Soccer Players". Orthopaedic Journal of Sports Medicine 8, nr 1 (1.01.2020): 232596711989232. http://dx.doi.org/10.1177/2325967119892320.

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Background: Hip and groin injuries are common in competitive soccer players and have been shown to be significant sources of time loss. There are few studies describing the epidemiology of hip and groin injuries in female National Collegiate Athletic Association (NCAA) soccer players. Purpose: To describe the epidemiology of hip and groin injuries in women’s collegiate soccer players. Study Design: Descriptive epidemiology study. Methods: The NCAA Injury Surveillance System/Program (ISS/ISP) was analyzed from 2004 through 2014 for data related to hip and groin injuries in female collegiate soccer players. Injuries and athlete-exposures (AEs) were reported by athletic trainers. Data were stratified by time of season, event type, injury type, treatment outcome, time loss, and player field position. Results: Between 2004 and 2014, there were 439 recorded hip or groin injuries in female soccer players and an overall rate of injury of 0.57 per 1000 AEs. Injuries were 12.0 times more likely to occur during the preseason (4.41/1000 AEs) as opposed to during the regular season (0.37/1000 AEs) (injury rate ratio [IRR], 12.01; 95% confidence interval [CI], 9.92-14.55) or postseason (0.38/1000 AEs) (IRR, 11.55; 95% CI, 7.06-18.91). Rates of injury were similar during the regular season and postseason (IRR, 0.96; 95% CI, 0.59-1.58). Rates of injury were higher during competition (0.69/1000 AEs) than during practice (0.52/1000 AEs) (IRR, 1.33; 95% CI, 1.08-1.63). Most injuries were new (87.5%; n = 384) and unlikely to recur (12.5%; n = 55). Conclusion: Hip and groin injuries in female NCAA soccer players are uncommon, and fortunately, most players return to play quickly without recurrence. Future prospective studies should evaluate the effectiveness of strength and conditioning programs in preventing these injuries.

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Kekelekis, Afxentios, Zoe Kounali, Nikolaos Kofotolis, Filipe Manuel Clemente i Eleftherios Kellis. "Epidemiology of Injuries in Amateur Male Soccer Players: A Prospective One-Year Study". Healthcare 11, nr 3 (25.01.2023): 352. http://dx.doi.org/10.3390/healthcare11030352.

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The purpose of this study was to prospectively monitor and analyze injuries in Greek amateur male soccer players over one competitive season. One hundred and thirty male soccer players in a regional amateur league participated in this study. Injury data and exposure were collected from six teams during training and competition match over one season (2018/19). Injuries were collected weekly and were classified by setting, mechanism, severity, type, calendar distribution, period of injury occurrence, and anatomical location. A total of 103 injuries were recorded during the season, with an incident rate (IR) of 5.5 injuries/1000 h with 95% confidence intervals (CI) values of 4.45 (lower limit) and 6.09 (upper limit). Furthermore, IR was greater for the posterior thigh (IR 1.83/1000 h, 95% CI 1.21–2.44) and hip/groin complex (IR 1.45/1000 h, 95% CI 0.90–1.99) compared to other anatomical locations. Similarly, muscle injuries had greater IR (IR 3.61/1000 h, 95% CI 2.74–4.47) than other tissues. Amateur soccer players had a seven-fold greater chance of getting injured during games (IR 20.76/1000 h, 95% CI 15.28–26.24) rather than during training (IR 3.077/1000 h, 95% CI 2.16–3.80), while injury rates were higher towards the end of a session and peaked in October and February of the season. Based on these results, amateur soccer may benefit from injury prevention strategies incorporated into their regular training practice and focus on muscle injuries, especially in the posterior thigh and the hip/groin complex.

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Moreno-Pérez, Víctor, Gil Rodas, Marcelo Peñaranda-Moraga, Álvaro López-Samanes, Daniel Romero-Rodríguez, Per Aagaard i Juan Del Coso. "Effects of Football Training and Match-Play on Hamstring Muscle Strength and Passive Hip and Ankle Range of Motion during the Competitive Season". International Journal of Environmental Research and Public Health 19, nr 5 (2.03.2022): 2897. http://dx.doi.org/10.3390/ijerph19052897.

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Deficits in hamstring muscle strength and in hip range of motion (ROM) have been considered risk factors for hamstring muscle injuries. However, there is a lack of information on how chronic exposure to regular football training affects hamstring muscle strength and hip ROM. The aim of this study was to examine the longitudinal effect of football training and competition during a complete season on hamstring muscle strength and hip ROM in football players. A total of 26 semi-professional football players underwent measurements of isometric hamstring muscle strength and passive hip flexion/extension, and internal/external hip rotation (IR/ER) ROM during the football season (pre-season, mid-season, end-season). Compared to pre-season, hamstring muscle strength increased in the dominant (+11.1%, p = 0.002) and non-dominant (+10.5%, p = 0.014) limbs in the mid-season. Compared to mid-season, hamstring strength decreased in the dominant (−9.3%, p = 0.034) limb at end-season. Compared to the pre-season, hip extension ROM decreased in mid-season in the dominant (−31.7%, p = 0.007) and non-dominant (−44.1%, p = 0.004) limbs, and further decreased at end-season (−49.0%, p = 0.006 and −68.0%, p < 0.001) for the dominant and non-dominant limbs. Interlimb asymmetry for hip IR ROM increased by 57.8% (p < 0.002) from pre-season to mid-season. In summary, while hamstring muscle strength increased during the first half of the football season in football players, a progressive reduction in hip extension ROM was observed throughout the season. The reduced hip extension ROM suggests a reduced mobility of the hip flexors, e.g., iliopsoas, produced by the continuous practice of football. Consequently, hip-specific stretching and conditioning exercises programs should be implemented during the football season.

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Yeh, Shao-Wei, Mei-Jung Chen, Cheng-Tien Chuang i Wen-Bin Lin. "Performance Evaluation of Teams in Chinese Professional Baseball League". International Journal of Asian Business and Information Management 9, nr 1 (styczeń 2018): 39–51. http://dx.doi.org/10.4018/ijabim.2018010104.

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In this article, a performance evaluation of the Chinese Professional Baseball League (CPBL) was conducted from a human resources (HR) perspective. Two important aspects were included: (1) a comprehensive evaluation of the competition performance of the professional baseball teams in international games and regular season games; and (2) the data envelopment analysis (DEA) and “two-stage” methodologies, which were employed to process truncated data to resolve the factors that affect the efficiency of the decision-making unit (DMU). By applying DEA and truncated regression analysis with bootstrapping, the performances of CPBL teams in games of different intensities were investigated. The number of foreign coaches and native players both were the key factors to affect the competitive efficiency of CPBL teams, and the Uni President 7-ELEVEN Lions had the best performance efficiency team. This interdisciplinary investigation provided the most appropriate references and recommendations for professional baseball teams on HR management so that baseball fans' expectations are met.

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Kay, Melissa C., Johna K. Register-Mihalik, Aaron D. Gray, Aristarque Djoko, Thomas P. Dompier i Zachary Y. Kerr. "The Epidemiology of Severe Injuries Sustained by National Collegiate Athletic Association Student-Athletes, 2009–2010 Through 2014–2015". Journal of Athletic Training 52, nr 2 (1.02.2017): 117–28. http://dx.doi.org/10.4085/1062-6050-52.1.01.

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Context: Few researchers have described the incidence of the most severe injuries sustained by student-athletes at the collegiate level. Objective: To describe the epidemiology of severe injuries within 25 National Collegiate Athletic Association (NCAA) sports in the 2009–2010 through 2014–2015 academic years. Design: Descriptive epidemiology study. Setting: Aggregate injury and exposure data from 25 NCAA sports. Patients or Other Participants: Collegiate student-athletes in the 2009–2010 through 2014–2015 academic years. Main Outcome Measure(s): Injury data from the NCAA Injury Surveillance Program were analyzed. A severe injury (1) occurred during a sanctioned competition or practice, (2) required medical attention by an athletic trainer or physician, and (3) resulted in at least 21 days lost from sport activity or a premature end to the sport season. Injury counts, proportions, rates per 1000 athlete-exposures (AEs), rate ratios (RRs), and injury proportion ratios were reported with 95% confidence intervals (CIs). Results: A total of 3183 severe injuries were reported, for an injury rate of 0.66/1000 AEs. Wrestling had the highest severe injury rate (1.73/1000 AEs), followed by women's gymnastics (1.40/1000 AEs) and football (0.97/1000 AEs). Overall, the severe injury rate was higher in competition than in practice (RR = 4.25, 95% CI = 3.97, 4.56). Most severe injuries were reported during the regular season (69.3%, n = 2206); however, severe injury rates did not differ between the preseason and regular season (RR = 0.98, 95% CI = 0.91, 1.06). Common severely injured body parts were the knee (32.9%, n = 1047), lower leg/ankle/foot (22.5%, n = 715), and head/face/neck (11.2%, n = 358). Common severe injury diagnoses were sprains (32.9%, n = 1048), strains (16.9%, n = 538), and fractures (14.4%, n = 458). Common severe injury mechanisms were player contact (39.3%, n = 1251), noncontact (25.1%, n = 800), and surface contact (12.0%, n = 383). Conclusions: Severe injuries occurred across many sports and by numerous mechanisms. By identifying these sport-specific patterns, clinicians' efforts can be tailored toward improving injury-prevention strategies and health outcomes.

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Vanpee, Katrien. "Allegiance Performed: Waṭaniyyah Poetry on the Stage of the Shāʿir al-Milyūn Competition". Journal of Arabic Literature 50, nr 2 (15.07.2019): 173–96. http://dx.doi.org/10.1163/1570064x-12341384.

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Abstract This article examines the understudied political dynamics of the televised nabaṭī poetry competition Shāʿir al-Milyūn (“Million’s Poet”) to offer a new understanding of the program. Media coverage has focused on the participation of a single female participant, while scholars have assessed Shāʿir al-Milyūn as primarily an experiment in the wedding of local tradition to modern technology, overlooking the central and complex negotiations of ruler-ruled relationships taking place on the show’s stage. Shāʿir al-Milyūn’s political aspect becomes particularly apparent in the regular performances of waṭaniyyah verse, i.e. poetry for the waṭan or homeland. Reading a waṭaniyyah poem performed during the fifth season of Shāʿir al-Milyūn by Emirati poet Aḥmad bin Hayyāy al-Manṣūrī, I argue that Shāʿir al-Milyūn, rather than merely celebrating local poetic tradition, operates as a political technology that provides both poetry contestants and the show’s princely patron with opportunities to articulate and enact expectations of proper citizenship.

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Meyer, Tim, Dietrich Mack, Katrin Donde, Oliver Harzer, Werner Krutsch, Annika Rössler, Janine Kimpel, Dorothee von Laer i Barbara C. Gärtner. "Successful return to professional men’s football (soccer) competition after the COVID-19 shutdown: a cohort study in the German Bundesliga". British Journal of Sports Medicine 55, nr 1 (24.09.2020): 62–66. http://dx.doi.org/10.1136/bjsports-2020-103150.

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ObjectivesTo evaluate the restart of the German Bundesliga (football (soccer)) during the COVID-19 pandemic from a medical perspective.MethodsParticipants were male professional football players from the two highest German leagues and the officials working closely with them. Our report covers nine match days spread over 9 weeks (May to July 2020). Daily symptom monitoring, PCR testing for SARS-CoV-2 RNA twice weekly, and antibody tests (on two occasions—early during the phase in May 2020 and in the week of the last match) were conducted. Target variables were: (1) onset of typical COVID-19 symptoms, (2) positive PCR results, and (3) IgG seroconversion against SARS-CoV-2. All detected seroconversions were controlled by neutralisation tests.FindingsSuspicious symptoms were reported for one player; an immediate additional PCR test as well as all subsequent diagnostic and antibody tests proved negative for coronavirus. Of 1702 regularly tested individuals (1079 players, 623 officials members), 8 players and 4 officials tested positive during one of the first rounds of PCR testing prior to the onset of team training, 2 players during the third round. No further positive results occurred during the remainder of the season. 694 players and 291 officials provided two serum samples for antibody testing. Nine players converted from negative/borderline to positive (without symptoms); two players who initially tested positive tested negative at the end of the season. 22 players remained seropositive throughout the season. None of the seroconversions was confirmed in the neutralisation test.ConclusionProfessional football training and matches can be carried out safely during the COVID-19 pandemic. This requires strict hygiene measures including regular PCR testing.

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Levett, M. P. "Effects of various hand-weeding programmes on yield and components of yield of sweet potato (Ipomoea batatas) grown in the tropical lowlands of Papua New Guinea". Journal of Agricultural Science 118, nr 1 (luty 1992): 63–70. http://dx.doi.org/10.1017/s0021859600068015.

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SUMMARYThe effects of weed competition, harvest date and cultivar on sweet potato (Ipomoea batatas(L.) Lam.) yield and components of yield were investigated in three factorial experiments planted during the wet seasons of 1984 (Expt 1) and 1986 (Expts 2 and 3) in the tropical lowlands In Expts 1 and 2, the commencement of regular hand-weeding (every 14 days) was delayed for varying lengths of time following planting. In Expt 3, the duration of hand-weeding from planting onwards was varied. The main competing weed species following planting were Cyperus rotundus, C. brevifolius, Euphorbia geniculata and Portulaca oleracea. After canopy closure, E. hirta, Imperata cylindrica, Eleusine indica, Sida rhombifolia, Mollugo pentaphylla and Mimosa invisa were the predominant weeds to emerge and persist. Cultivars differed in their sensitivity to weed competition. In L431 both mean marketable root tuber weight and number of tubers/plant were severely reduced. However, in L44, tuber number was more sensitive than tuber weight: marketable tuber weight was significantly reduced only by prolonged weed competition (no weeding until 56 days after planting (DAP)). In Expts 1 and 2, delaying the commencement of weeding beyond 14 DAP significantly decreased vine weight, total yield and mean number of tubers/plant. In Expt 3, prolonging regular weeding until 14 DAP and longer significantly increased total and marketable tuber yield and mean number of tubers/plant.Effects of weed competition in the early part of the season during the first 28–42 DAP substantially reduced crop production in the later part of the growth cycle (after 110 DAP). This was probably due to a partial suppression of vine growth early on, which reduced tuberous root initiation and thus limited the number of root tubers that could develop in the later stages of crop growth. Hand-weeding during the period 28–42 DAP also appeared to have a detrimental effect on tuber initiation as a result of mechanical root disturbance at this sensitive period of root differentiation. There was also a trend towards lower yields when the crop was regularly hand-weeded after 56 DAP, probably due to disturbance of the vine canopy.The critical period for weed competition commenced at or before 14 DAP, possibly as early as 7 DAP, and did not continue beyond 56 DAP. In order to avoid weed competition and the detrimental mechanical effects of hand-weeding, an optimum hand-weeding programme for sweet potato in the tropical lowlands of will probably involve (i) keeping the crop weedfree for the first 14–21 DAP; (ii) no crop disturbance during the period of maximum tuberous root initiation (from c. 21–28 DAP until 42–56 DAP); (iii) clean weeding at c. 56 DAP; and (iv) minimal or no weeding after 56 DAP. Weeding during the period 7–14 DAP is particularly important.

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Nudds, Thomas D., i Robert G. Wickett. "Body size and seasonal coexistence of North American dabbling ducks". Canadian Journal of Zoology 72, nr 4 (1.04.1994): 779–82. http://dx.doi.org/10.1139/z94-104.

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Controversy exists about whether (i) regular character (usually body size) ratios among coexisting species might result from interspecific competition and (ii) migratory dabbling ducks (Anas sp.) might be limited by the abundance of invertebrate prey on wintering or breeding areas. We tested these ideas by comparing the extent to which coexistence of dabbling ducks on breeding and wintering grounds depended on differences in body size which, in turn, reflect differences in prey size. Species of dabbling ducks that differ in body size by less than a factor of 1.2 co-occurred less frequently than expected by chance during the breeding season when duck assemblages are characterized by low dominance (i.e., the fractional abundances of species are roughly similar). In winter, when duck assemblages are characterized by high dominance (i.e., a few abundant species and many rarer ones), the pattern of species co-occurrence in relation to differences in body size could not be discerned from that which might occur by chance. This implies that competition for invertebrate prey, at least, is unlikely during winter. These results contrast with data from assemblages of other sexually reproducing vertebrate species, and with recent theories which predict that species' assortment patterns should be more regular than random in assemblages characterized by high dominance. Our results are consistent with the idea that communities of dabbling ducks are assembled, except during winter, according to some limiting size similarity and are influenced more by interspecific interactions than by chance.

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Nouni-Garcia, Rauf, Concepcion Carratala-Munuera, Domingo Orozco-Beltran, Adriana Lopez-Pineda, María Rosario Asensio-Garcia i Vicente F. Gil-Guillen. "Clinical benefit of the FIFA 11 programme for the prevention of hamstring and lateral ankle ligament injuries among amateur soccer players". Injury Prevention 24, nr 2 (22.06.2017): 149–54. http://dx.doi.org/10.1136/injuryprev-2016-042267.

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ObjectiveTo analyse the relationship between the implementation of ‘the 11’ protocol during the regular season in a men’s amateur soccer team and the rate of hamstring and lateral ankle ligament (LAL) injuries, and to estimate the clinical benefit of the programme according to the type of injury and the position field.MethodsThis cohort study was conducted in two different men’s amateur soccer teams. During two seasons, the exposed group (43 players) performed ‘the 11’ protocol twice a week, and the unexposed group (43 players) performed the regular training programme. All players trained three times per week for 1.5 hours per day. Data collection was performed for every 1000 hours of play.Results18 hamstring injuries (injury rate (IR) of 2.26 injuries/1000 training+competition hours) and 15 LAL injuries (IR of 1.88 injuries/1000) were registered in the exposed group. In the unexposed group, there were 25 LAL injuries (IR of 3.14 injuries/1000) and 35 hamstring injuries (IR of 4.39 injuries/1000). The number needed to treat to prevent one new case was 3.9 in LAL injuries, 3.31 in biceps femoris injuries and 10.7 in recurrent hamstring injuries.Conclusions‘The 11’ programme reduced the incidence of hamstring and LAL injuries in amateur players. According to the field position, the programme was effective for defenders and midfielders. In accordance with the type of injury, the exposed group had a lower risk of LAL, biceps femoris and hamstring injuries compared with those in the unexposed group.

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Makovicka, Justin L., David G. Deckey, Karan A. Patel, Jeffrey D. Hassebrock, Andrew S. Chung, Sailesh V. Tummala, Thomas C. Hydrick, Austin Pena i Anikar Chhabra. "Epidemiology of Lumbar Spine Injuries in Men’s and Women’s National Collegiate Athletic Association Basketball Athletes". Orthopaedic Journal of Sports Medicine 7, nr 10 (1.10.2019): 232596711987910. http://dx.doi.org/10.1177/2325967119879104.

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Background: Lumbar spine injuries (LSIs) are common in both men’s and women’s National Collegiate Athletic Association (NCAA) basketball players and can frequently lead to reinjuries and persistent pain. Purpose: To describe the epidemiology of an LSI in collegiate men’s and women’s basketball during the 2009-2010 through 2013-2014 academic years. Study Design: Descriptive epidemiology study. Methods: The incidence and characteristics of LSIs were identified utilizing the NCAA Injury Surveillance Program (ISP). Rates of injury were calculated as the number of injuries divided by the total number of athlete-exposures (AEs). AEs were defined as any student participation in 1 NCAA-sanctioned practice or competition. Incidence rate ratios (IRRs) were then calculated to compare the rates of injury between season, event type, mechanism, injury recurrence, and time lost from sport. Results: The NCAA ISP reported 124 LSIs from an average of 28 and 29 men’s and women’s teams, respectively. These were used via validated weighting methodology to estimate a total of 5197 LSIs nationally. The rate of LSIs in women was 2.16 per 10,000 AEs, while men suffered LSIs at a rate of 3.47 per 10,000 AEs. Men were 1.61 times more likely to suffer an LSI compared with women. In men, an LSI was 3.48 times more likely to occur in competition when compared with practice, while in women, an LSI was 1.36 times more likely to occur in competition than in practice. Women suffered the highest LSI rate during the postseason, while the highest rate in men was during the regular season. The majority of both female (58.9%; n = 1004) and male (73.1%; n = 2353) athletes returned to play within 24 hours of injury. Conclusion: To date, this is the largest study to characterize LSIs in NCAA basketball and provides needed information on the prevalence and timing of these injuries. The majority of injuries in both sexes were new, and most athletes returned to play in less than 24 hours. Injury rates were highest during competition in both sexes.

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Sage, Larry A. "Effects of a Target RIM on Basketball Shooting Accuracy". Perceptual and Motor Skills 64, nr 3 (czerwiec 1987): 863–66. http://dx.doi.org/10.2466/pms.1987.64.3.863.

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The purpose of this study was to determine the effectiveness of a basketball target rim on free-throw and field-goal shooting accuracy. The target rims employed in this study were different from regular rims as the apparatus that connects the target rim to the backboard was painted a neutral color. Subjects included all of the 1984–85 Eastern Washington University men's basketball players and the other players on 10 basketball teams who played games with the Eastern Washington University men's basketball team in the 1984–85 season. Practice statistics were kept in all EWU shooting situations, drills as well as scrimmages. Individual game statistics of the entire basketball game were made for the 10 games in which the target rims were used. A random selection of combined free-throw and field-goal shooting accuracy taken during the practice sessions showed that shooting percentage on the target rim was noticeably higher than the shooting percentage on the regular rim. The shooting accuracy of the EWU team and the visiting teams during game competition showed that accuracy of field-goal shooting on the target rim was significantly better than on the regular rim but not for free-throw accuracy. The target rim may improve shooting accuracy and influence total scoring in basketball.

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Brinkman, Joseph C., Sailesh V. Tummala, Kade S. McQuivey, Jeffrey D. Hassebrock, Christian Pagdilao, Justin L. Makovicka i Anikar Chhabra. "Epidemiology of Spine Injuries in National Collegiate Athletic Association Men’s Wrestling Athletes". Orthopaedic Journal of Sports Medicine 9, nr 9 (1.09.2021): 232596712110320. http://dx.doi.org/10.1177/23259671211032007.

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Background: Spine injuries are common in collegiate wrestlers and can lead to reinjury, persistent pain, and time lost from participation. Purpose: To describe the epidemiology of spine injuries in National Collegiate Athletic Association (NCAA) wrestlers between academic years 2009 to 2010 and 2013 to 2014. Study Design: Descriptive epidemiology study. Methods: The incidence and characteristics of spine injuries were identified utilizing the NCAA–Injury Surveillance Program database. Spine injuries were assessed for injury type, injury mechanism, time of season, event type, recurrence, participation restriction, and time lost from participation. Rates of injury were calculated as the number of injuries divided by the total number of athlete-exposures (AEs). Injury rate ratios (IRRs) were calculated for event type and time of season, and results with 95% confidence intervals that did not include 1.0 were considered statistically significant. Results: There were an estimated 2040 spine injuries reported in the database over the 4-year period, resulting in an injury rate of 0.71 per 1000 AEs. Spine injuries were over twice as likely to occur in competitions as in practices (IRR, 2.02; 95% confidence interval, 1.10-3.69). More injuries occurred in both the preseason (0.94 per 1000 AEs) and the postseason (1.12 per 1000 AEs) compared with the regular season (0.55 per 1000 AEs). Contact injuries (42%) were the most common mechanism of injury, and brachial plexus injury (20%) was the most common diagnosis. Only 1.3% of injuries required surgery, and athletes most commonly returned to sport within 24 hours (33%) or within 6 days (25%). Conclusion: This investigation found an overall injury rate of 0.71 per 1000 AEs in wrestling athletes between academic years 2009 to 2010 and 2013 to 2014. The majority of these injuries were new, and athletes most commonly returned to sport within 24 hours. The injury rate was highest in competition, and both the preseason and the postseason showed a higher injury rate than that in season. Efforts to improve injury prevention and management should be informed by these findings.

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Sacewicz, Tomasz, Sławomir Bodasiński, Marcin Śliwa, Paulina Szyszka, Zenon Mazur i Adam Czaplicki. "Biomechanical Assessment of Motor Abilities in Male Handball Players During the Annual Training Macrocycle". Polish Journal of Sport and Tourism 23, nr 4 (1.12.2016): 190–95. http://dx.doi.org/10.1515/pjst-2016-0025.

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Abstract Introduction. The aim of the study was to determine the torque of the knee extensors and flexors of the lead lower limb, the torque of the shoulder extensors and flexors of the dominant upper limb, and the torque generated by the muscles of the kinematic chain going from the trail lower limb to the hand of the dominant limb in male handball players during the annual training macrocycle. Changes in jump height and throwing velocity were also investigated. Material and methods. The study involved 13 handball players from a Polish second-league team. The measurements were performed four times: at the beginning of the preparation period, at the beginning of the season, at the end of the first part of the season, and at the end of the second part of the season. Torque was measured in isokinetic and isometric conditions. Jumping ability was tested using a piezoelectric platform, and throwing velocity was measured with a speed radar gun. Results. The study found statistically significant differences between the relative torque values of the knee extensors (p < 0.002) and flexors (p < 0.003) of the lead leg measured in isokinetic conditions between the first three measurements and the final one. Isokinetic measurement of the torque of the muscles of the kinematic chain going from the trail leg to the hand of the dominant arm decreased in a statistically significant way at the end of the season. As for the results of the measurement of the torque of the shoulder extensors and flexors in static conditions, no statistically significant differences were observed between the four measurements. However, statistically significant differences were noted in jumping ability and throwing velocity in the annual training macrocycle. Conclusions. The results of the study indicate that there is a need to perform regular assessments of players’ strength and jumping ability during the competition period. There is a need to modify the training methods used during the preparation period and in the second part of the season as well as to individualise training at the end of the competition period.

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Carrani, Lucia Maria, Arnau Baena Riera, Albert Altarriba-Bartés, Beatriz Gil-Puga, Aitor Piedra Gonzalez, Gerard Piniés-Penadés, Martí Casals i Javier Peña. "Are eSports players comparable to traditional athletes? A cross-sectional study". Aloma: Revista de Psicologia, Ciències de l'Educació i de l'Esport 40, nr 2 (15.11.2022): 83–92. http://dx.doi.org/10.51698/aloma.2022.40.2.83-92.

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There is some debate as to whether professional eSports players should be regarded as athletes in the traditional sense. With an eye toward addressing this controversy, this study was undertaken with the aim of analyzing elite eSports players' characteristics and their training and competition routines, and of comparing them with data on their counterparts in traditional sports. Fifty-one elite eSports players answered an ad hoc online questionnaire that gathered data on their basic traits, general training and competition habits, level of regular physical activity, and injuries sustained during the 2018-2019 season. The results indicated that elite eSports players have a considerable training load (38.37±20.33 h/week) and use strategies to improve their performance (i.e., warm-ups, 73.91%; resistance training, 74.19%; psychological training 31.25%). However, some of these activities are not generally designed or supervised by qualified professionals. Meanwhile, some of the players reported injuries (13.04%) that had led to losses in competition time ranging from one day to more than a month. In terms of the comparison with traditional athletes, our findings show that eliteeSports players seem to experience a similar training load and apply comparable strategies to boost their sports results. As such, they can be properly considered professional athletes, but players, the eSports industry, and the teams' staffs should be more aware of the most appropriate strategies to preserve long-term health and avoid burn-out.

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Jalkanen, Anneli. "Growth and Morphology of Black Spruce, Jack Pine, and White Spruce Container Seedlings in Northern Ontario". Northern Journal of Applied Forestry 12, nr 2 (1.06.1995): 69–74. http://dx.doi.org/10.1093/njaf/12.2.69.

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Abstract The development of morphological attributes of containerized seedlings during the growing season was studied in eight crops from three nurseries in Northern Ontario, including four black spruce crops, three jack pine crops, and one white spruce crop. The variability was proportionally largest in root and shoot dry mass, followed by height and diameter. During seedling growth, proportionally the variability of size did not seem to increase. In absolute scale, however, differences between individual seedlings increased more than differences between seedling trays, possibly due to competition between individuals. Height and shoot growth were greater in the beginning of the growing season, and diameter and root growth were greater toward the end. In comparison to standards, the balance between morphological attributes (height/diameter, shoot/root) was usually acceptable, and usually independent of seedling size. The easiest way of monitoring crop development is to take seedling samples at regular intervals and to construct a growth progression curve for seedling height, if diameter growth reaches acceptable level. Care should be taken that the height of seedlings does not increase too much at the expense of diameter and root development in the larger crops. To monitor this, height-diameter ratios and shoot-root ratios might be measured a couple of times during the growing season to take corrective action if necessary. North. J. Appl. For. 12(2):69-74.

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Hassebrock, Jeffrey D., Karan A. Patel, Justin L. Makovicka, Andrew S. Chung, Sailesh V. Tummala, Austin J. Peña, Kyle E. Williams, David E. Hartigan i Anikar Chhabra. "Lumbar Spine Injuries in National Collegiate Athletic Association Athletes: A 5-Season Epidemiological Study". Orthopaedic Journal of Sports Medicine 7, nr 1 (1.01.2019): 232596711882004. http://dx.doi.org/10.1177/2325967118820046.

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Background: Lumbar spine injuries in National Collegiate Athletic Association (NCAA) athletes have not been well studied. Purpose: To describe the epidemiology of lumbar spine injuries in NCAA athletes during the 2009/2010 through 2013/2014 academic years utilizing the NCAA Injury Surveillance Program (ISP). Study Design: Descriptive epidemiology study. Methods: A voluntary convenience sample of NCAA varsity teams from 25 sports was examined. Mechanism of injury, injury recurrence, and time lost from sport were recorded. Injury rates were calculated as the number of injuries divided by the total number of athlete-exposures (AEs). AEs were defined as any student participation in 1 NCAA-sanctioned practice or competition. Injury rate ratios and injury proportion ratios were calculated to compare the rates within and between sports by event type, season, patient sex, mechanism, injury recurrence, and time lost from sport. Comparisons between sexes were made utilizing data that had both male and female samples. Results: An estimated 50,834 lumbar spine injuries were identified. The overall rate of injuries was 2.88 per 10,000 AEs. The rate of injuries was 2.60 per 10,000 AEs in men compared with 2.89 per 10,000 AEs in women for sex-comparable sports. Women were 1.11 times more likely than men to suffer a lumbar spine injury. Women's gymnastics (8.02 injuries per 10,000 AEs) and women's tennis (5.73 injuries per 10,000 AEs) had the highest rates of lumbar spine injuries. Athletes were 1.6 and 2.4 times more likely to sustain a lumbar spine injury during the preseason than the regular season or postseason, respectively. Noncontact was the most common mechanism of injury (45%). Injury recurrence was most common in men’s outdoor track (43%). Most injuries resulted in less than 24 hours of time loss from event participation (64%). Conclusion: The rate of lumbar spine injuries was high in NCAA athletes, and injuries commonly recurred (20.73%). In general, women were more likely to sustain a lumbar spine injury compared with men. Higher injury rates occurred during competition and via a noncontact mechanism of injury. In addition to prevention programs, reconditioning programs should be considered to prevent these injuries.

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Bond, Monica L., Jerry O. Wolff i Sven Krackow. "Recruitment sex ratios in gray-tailed voles (Microtus canicaudus) in response to density, sex ratio, and season". Canadian Journal of Zoology 81, nr 8 (1.08.2003): 1306–11. http://dx.doi.org/10.1139/z03-116.

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We tested predictions associated with three widely used hypotheses for facultative sex-ratio adjustment of vertebrates using eight enclosed populations of gray-tailed voles, Microtus canicaudus. These were (i) the population sex ratio hypothesis, which predicts that recruitment sex ratios should oppose adult sex-ratio skews, (ii) the local resource competition hypothesis, which predicts female-biased recruitment at low adult population density and male-biased recruitment at high population density, and (iii) the first cohort advantage hypothesis, which predicts that recruitment sex ratios should be female biased in the spring and male biased in the autumn. We monitored naturally increasing population densities with approximately equal adult sex ratios through the spring and summer and manipulated adult sex ratios in the autumn and measured subsequent sex ratios of recruits. We did not observe any significant sex-ratio adjustment in response to adult sex ratio or high population density; we did detect an influence of time within the breeding season, with more female offspring observed in the spring and more male offspring observed in the autumn. Significant seasonal increases in recruitment sex ratios indicate the capacity of female gray-tailed voles to manipulate their offspring sex ratios and suggest seasonal variation in the relative reproductive value of male and female offspring to be a regular phenomenon.

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Mikulic, Pavle. "Seasonal Changes in Fitness Parameters in a World Champion Rowing Crew". International Journal of Sports Physiology and Performance 7, nr 2 (czerwiec 2012): 189–92. http://dx.doi.org/10.1123/ijspp.7.2.189.

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Purpose:To examine variations in physical, physiological, and performance parameters over an annual training cycle in a world champion rowing crew.Methods:Four world-class rowers, all of them members of the men’s heavyweight quadruple sculls squad who are current world rowing champions, were assessed 3 times at regular 4-mo intervals during the 2011 season (November 2010, March 2011, and July 2011). Physical assessments included stature, body mass, body composition, whereas physiological and performance assessments obtained during an incremental rowing ergometer test to exhaustion included maximum oxygen uptake and anaerobic gas-exchange threshold with corresponding power output values.Results:Body mass (∼95 kg) and body composition (∼12% body fat) remained stable over the annual training cycle. Power output at anaerobic gas-exchange threshold increased +16% from November to July, whereas the corresponding oxygen uptake, expressed as a percentage of maximum oxygen uptake, increased from 83% to 90%. Maximum oxygen uptake decreased from 6.68 L/min in November to 6.10 L/min in March before rising to 6.51 L/min in July. The corresponding power output increased steadily from 450 W to 481 W.Conclusion:Seasonal variation in body mass and body composition of 4 examined world-class rowers was minimal. Oxygen uptake and power output corresponding to anaerobic threshold continuously increased from off-season to peak competition season. Seasonal variation in maximum oxygen uptake reached ∼10%; however, it remained above 6 L/min, that is, the value consistently observed in top caliber heavyweight rowers regardless of the time of the assessment.

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Franco Lima, Ricardo, Jose Palao, Henrique Castro i Filipe Clemente. "Measuring the training external jump load of elite male volleyball players: an exploratory study in Portuguese League (Medición de la carga externa de entrenamiento de los jugadores de voleibol masculino de élite: un estudio exploratorio en la Liga Portug". Retos, nr 36 (6.06.2019): 454–58. http://dx.doi.org/10.47197/retos.v36i36.68321.

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The purpose of this exploratory study was to assess the external jump-training load of different playing positions in male professional volleyball players during regular competitive microcycles. Five male elite volleyball players participated in this study. The sample was composed by five male elite volleyball players of a team from Portugal’s first division.was composed of 8,532 jumps were analyzed during 12 practice sessions of four competitive microcycles of the regular season (three practices in each microcycle). A descriptive design was implemented to analyze the number of jumps, jump heights, and rest time by players’ playing positions (middle blockers, setter, and outside hitters), by training sessions, and by microcycles. The jump height and jump moment were recorded using an inertial measurement device. The setter made a significantly greater number of jumps than middle blockers and outside hitters. Middle blockers and outside hitters accumulate their jumps in specific moments (frontcourt). No significant differences were found in the jump intensity with player positions and with different training days of the microcycle. Significant lower amount of jumps were found on the training day before the competition. Results show how the coach modified the jump-training load of the session in the day prior to the competition.Resumen. El propósito de este estudio exploratorio fue evaluar la carga externa de entrenamiento de salto de diferentes posiciones de juego en jugadores de voleibol profesionales masculinos durante microciclos competitivos regulares. Cinco jugadores masculinos de voleibol de élite participaron en este estudio. La muestra estuvo compuesta por cinco jugadores de voleibol de élite masculinos de un equipo de la primera división de Portugal. Se compuso de 8,532 saltos y se analizaron durante 12 sesiones de práctica de cuatro microciclos competitivos de la temporada regular (tres prácticas en cada microciclo). Se implementó un diseño descriptivo para analizar la cantidad de saltos, alturas de salto y tiempo de descanso por las posiciones de juego de los jugadores (bloqueadores medios, colocadores y bateadores externos), por sesiones de entrenamiento y por microciclos. La altura de salto y el momento de salto se registraron utilizando un dispositivo de medición inercial. Setter hizo un número significativamente mayor de saltos que los bloqueadores medios y los bateadores externos. Los bloqueadores medios y los bateadores externos acumulan sus saltos en momentos específicos primera línea. No se encontraron diferencias significativas en la intensidad del salto con las posiciones de los jugadores y con los diferentes días de entrenamiento del microciclo. Se encontró una cantidad de saltos significativamente menor en el día de entrenamiento antes de la competición. Los resultados muestran cómo el entrenador modificó la carga de entrenamiento de salto de la sesión en el día anterior a la competición.

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Edouard, Pascal, Kathrin Steffen, Marie Peuriere, Pierre Gardet, Laurent Navarro i David Blanco. "Effect of an Unsupervised Exercises-Based Athletics Injury Prevention Programme on Injury Complaints Leading to Participation Restriction in Athletics: A Cluster-Randomised Controlled Trial". International Journal of Environmental Research and Public Health 18, nr 21 (28.10.2021): 11334. http://dx.doi.org/10.3390/ijerph182111334.

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Objective: To test the efficacy of the Athletics Injury Prevention Programme (AIPP) to reduce the percentage of athletes presenting at least one injury complaint leading to participation restriction (ICPR) over an athletics season. Methods: During the 2017–2018 athletics season, we included in this cluster randomised controlled trial (ClinicalTrials.gov Identifier: NCT03307434) 840 athletes randomly assigned (randomisation unit: athletic clubs) to a control group (regular training) or to an intervention group (regular training plus the AIPP 2/week). Using a weekly online questionnaire, athletes reported the ICPR, training and competition exposures, and, for the intervention group, the compliance with the AIPP. The primary outcome was the percentage of athletes presenting at least one ICPR over the study follow-up. Results: A total of 449 and 391 athletes were included in the intervention and control groups, respectively. From them, 68 (15.1%) and 100 (25.6%) athletes, respectively, provided 100% of the requested information during the follow-up (39 weeks). A total of 6 (8.8%) performed the AIPP 2/week or more. The proportion of athletes who had at least one ICPR over the follow-up period was similar in the intervention (64.7%) and control groups (65.0%), with adjusted odds ratios: 0.81 (95% CI 0.36 to 1.85). There were no between-group differences when comparing separately the subgroups corresponding with the different compliance levels. Conclusion: This cluster randomised controlled trial reported no efficacy of the AIPP. However, the overall response proportion and the compliance with the AIPP in the intervention group were low. In individual sports especially, efforts should be first made to improve the implementation and adoption of interventions.

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Albrecht, Jay M., i Brad N. Strand. "Basic First Aid Qualifications and Knowledge Among Youth Sport Coaches". Journal of Coaching Education 3, nr 3 (grudzień 2010): 3–18. http://dx.doi.org/10.1123/jce.3.3.3.

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The inception of organized youth sport in the United States began during the mid to late 1800s. With continual growth of organized youth sport throughout the twentieth century and into the twenty-first, youth sport has not been without important, and at times, serious implications. One of the implications involves injury in youth sport and the basic need for qualified youth sport coaches to care for injury situations that might arise during the course of regular season practices and games.One hundred fifty-four youth sport coaches from seven different youth sport organizations were surveyed to determine whether the coaches had the basic first aid (FA) and cardiopulmonary resuscitation/automated external defibrillation (CPR/AED) training to serve their young athletes in the event of an emergent or non-emergent injury or sudden illness. Additionally, coaches were asked whether they had the confidence to manage a basic emergency injury or illness situation should such an occurrence arise during the course of a sports season involving regular practices or game competition. Major findings of this study revealed that only 19% and 46% of the 154 youth sport coaches surveyed were formally trained with basic first aid and cardiopulmonary resuscitation certifications, respectively. Additional findings indicated that youth sport coaches holding one or two of the suggested certifications possessed more knowledge and confidence than those youth sport coaches who did not hold certification to use that knowledge when faced with FA injury or illness situation. In consideration of these findings, recommendations should be made to encourage or mandate youth sport coaches involved with organized youth sport to become FA and CPR/AED certified.

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Eckard, Timothy G., Zachary Y. Kerr, Darin A. Padua, Aristarque Djoko i Thomas P. Dompier. "Epidemiology of Quadriceps Strains in National Collegiate Athletic Association Athletes, 2009–2010 Through 2014–2015". Journal of Athletic Training 52, nr 5 (1.05.2017): 474–81. http://dx.doi.org/10.4085/1062-6050-52.2.17.

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Context: Few researchers have examined the rates and patterns of quadriceps strains in student-athletes in the National Collegiate Athletic Association (NCAA).Objective: To describe the epidemiology of quadriceps strains in 25 NCAA sports during the 2009–2010 through 2014–2015 academic years.Design: Descriptive epidemiology study.Setting: Convenience sample of NCAA programs from 25 sports during the 2009–2010 through 2014–2015 academic years.Patients or Other Particpants: Collegiate student-athletes participating in men's and women's NCAA athletics during the 2009–2010 through 2014–2015 academic years.Main Outcome Measure(s): Aggregate quadriceps strain injury and exposure data from the NCAA Injury Surveillance Program during the 2009–2010 through 2014–2015 academic years were analyzed. Quadriceps strain injury rates and injury rate ratios (IRRs) were reported with 95% confidence intervals (CIs).Results: Overall, 517 quadriceps strains were reported, resulting in an injury rate of 1.07/10 000 athlete-exposures (AEs). The sports with the highest overall quadriceps strain rates were women's soccer (5.61/10 000 AEs), men's soccer (2.52/10 000 AEs), women's indoor track (2.24/10 000 AEs), and women's softball (2.15/10 000 AEs). Across sex-comparable sports, women had a higher rate of quadriceps strains than men overall (1.97 versus 0.65/10 000 AEs; IRR = 3.03; 95% CI = 2.45, 3.76). The majority of quadriceps strains were sustained during practice (77.8%). However, the quadriceps strain rate was higher during competition than during practice (1.29 versus 1.02/10 000 AEs; IRR = 1.27; 95% CI = 1.03, 1.56). Most quadriceps strains occurred in the preseason (57.8%), and rates were higher during the preseason compared with the regular season (2.29 versus 0.63/10 000 AEs; IRR = 3.60; 95% CI = 3.02, 4.30). Common injury mechanisms were noncontact (63.2%) and overuse (21.9%). Most quadriceps strains restricted participation by less than 1 week (79.3%).Conclusions: Across 25 sports, higher quadriceps strain rates were found in women versus men, in competitions versus practices, and in the preseason versus the regular season. Most quadriceps strains were minor in severity, although further surveillance is needed to better examine the risk factors associated with incidence and severity.

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