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Botonis, Petros G., Argyris G. Toubekis, Gerasimos D. Terzis, Nickos D. Geladas i Theodoros I. Platanou. "Effects of Concurrent Strength and High-Intensity Interval Training on Fitness and Match Performance in Water-Polo Players". Journal of Human Kinetics 67, nr 1 (5.07.2019): 175–84. http://dx.doi.org/10.2478/hukin-2019-0001.
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AbstractThe purpose of the study was to examine changes in performance and match-induced fatigue over a 27-week training period. Eight national-level water-polo players performed a 5 x 200 m swimming test to calculate velocities corresponding to blood lactate concentration of 4.0, 5.0 and 10.0 mmol.l-1 at three testing periods: i) baseline, ii) end of the pre-season (8 weeks of 4 x 4 min swimming bouts), iii) end of the in-season (8 weeks of 8 x 20 m swimming sprints). During each testing period, four competitive matches were played and repeated sprints (8 x 20 m), 400 m swimming, and shooting accuracy were evaluated at the pre- and post-match. Repeated sprint tests were also conducted at mid-game. Analysis of variance for repeated measures was used to detect changes among training periods and within games. Swimming velocities corresponding to 4.0, 5.0 and 10.0 mmol.l-1 were increased after the pre-season by 9%, 7.7%, and 6.7% (p < 0.01) and decreased following the in-season compared to the pre-season by 8.9%, 7.0% and 3.3% (p < 0.01), respectively. Pre-match repeated sprints and 400 m performance were improved after the pre-season by 4.3% and 3.8% (p < 0.01) and decreased by ~3% after the in-season compared to the pre-season (p < 0.01). Mid- and post-match repeated sprint performance was improved after the pre-season by 4.8 ± 1.4% and 4.4 ± 1.1% and remained unchanged after the in-season compared to the pre-season. Post-match 400 m speed was improved by 3.2% after the pre-season (p < 0.01) and decreased by 2.8% after the in-season (p = 0.04).Pre-season training improved players’ aerobic endurance and performance. Intensified in-season training decreased aerobic power, endurance, and pre-match performance while maintaining match repeated sprint performance.
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Gonosova, Zuzana, Petr Stastny, Jan Belka, Lucia Bizovska i Michal Lehnert. "Muscle Strength Variations of Knee Joint Muscles in Elite Female Handball Players after Pre-Season Conditioning". Journal of Human Kinetics 63, nr 1 (24.09.2018): 105–15. http://dx.doi.org/10.2478/hukin-2018-0011.
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Abstract Monitoring seasonal variations in strength performance and the relative risk of injury indicators related to strength of hamstring (H) and quadriceps (Q) in female elite athletes is beneficial for the training process. The aim of this study was to examine and compare the level of muscle strength, the conventional ratio (HCONC/QCONC) as well as two functional and strength ratios reflecting the movement of knee extension (HECC/QCONC) and flexion (HCONC/QECC), and the bilateral percentage strength deficit (BSD) in elite female handball players. The concentric and eccentric isokinetic peak torque was measured at an angular velocity of 60°/s on three occasions (in-season cessation, 4 weeks of rest followed by 4 weeks of individual conditioning and 6 weeks of group conditioning) in eleven female handball players (age: 23.1 ± 3.5 years, body height: 1.73 ± 0.6 m). According to ANOVA results, the BSD of H muscles in the concentric mode decreased between the in-season cessation and the end of the pre-season, and HCONC/QCONC increased at the beginning of the pre-season and at the end of the pre-season in comparison with inseason cessation measurement. The effect size analyses showed that the off-season rest followed by 10 weeks of the conditioning programme increased Q and H strength in comparison with the previous season with a large effect. Coaches should include progressive conditioning in the pre-season phase to decrease the bilateral strength deficit and to support further conditioning development.
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Zumwalt, M., B. Gill, J. Amburn, J. Carver, T. Xu, T. Hewett i J. Slauterbeck. "PRE-SEASON STRENGTH AND CONDITIONING PROGRAM IN HIGH SCHOOL FEMALE ATHLETES". Medicine & Science in Sports & Exercise 35, Supplement 1 (maj 2003): S204. http://dx.doi.org/10.1097/00005768-200305001-01128.
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Zambak, Ömer. "Evaluation of the Physical Capacities of Pre-Season and End-Season Futsal Players". Journal of Educational Issues 6, nr 1 (22.06.2020): 345. http://dx.doi.org/10.5296/jei.v6i1.16993.
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The aim of the study is to evaluate the physical parameters of the futsal players before and after the season. In the study, the experimental group consisted of n = 10 male futsal players with an average age of 20.5±1.5 years, height 1.78±.03 cm, body weight 71.7±2.2 kg. The control group consisted of n = 10 male futsal players with an average age of 22.1±2.4 years, height 1.78±.03 cm, body weight 74.3±4.4 kg. Paired-T test was applied to pretest and posttest data for statistical analysis. There was no statistically significant difference in the weight, 30 m speed, 10 m speed, vertical jump, horizontal jump, anaerobic strength and shot velocity values of the experimental group. There was no statistically significant difference in the control group’s weight, 30 m speed, 10 m speed, vertical jump, horizontal jump, anaerobic force, shot velocity values.
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Robbins, Pete. "HIGH SCHOOL: A Pre-Season Strength Training Program For High School Wrestlers". National Strength & Conditioning Association Journal 15, nr 3 (1993): 62. http://dx.doi.org/10.1519/0744-0049(1993)015<0062:apsstp>2.3.co;2.
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James, Lachlan P., Jade Haycraft, Anthony Pierobon, Timothy J. Suchomel i Mark Connick. "Mixed versus Focused Resistance Training during an Australian Football Pre-Season". Journal of Functional Morphology and Kinesiology 5, nr 4 (18.12.2020): 99. http://dx.doi.org/10.3390/jfmk5040099.
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The purpose of this investigation was to determine the effect of a focused versus mixed-methods strength-power training plan on athletes undertaking high volumes of concurrent training. Fourteen junior elite male Australian football players were randomly assigned into either the focused or mixed group. Both training groups undertook a sequenced training intervention consisting of a four-week mesocycle emphasising heavy strength followed by a four-week mesocycle of high velocity emphasis. Training differed between groups by way of the degree of emphasis placed on the targeted attribute in each cycle and occurred during the preseason. Testing occurred pre- and post-training and consisted of the unloaded and loaded (+20 kg) countermovement jump (CMJ). Focused training elicited practical (non-trivial) improvements in flight time to contraction ratio (FT:CT) (g = 0.45, ±90% confidence interval 0.49) underpinned by a small reduction in contraction time (g = −0.46, ±0.45) and a small increase in braking (g = 0.36, ±0.42) and concentric phase mean force (g = 0.22, ±0.39). Conversely, the mixed group demonstrated an unchanged FT:CT (g = −0.13, ±0.56). Similar respective changes occurred in the loaded condition. Preferential improvements in FT:CT occur when a greater focus is placed on a targeted physical quality in a sequenced training plan of junior elite Australian football players during preseason training.
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Comfort, Paul, Christopher Thomas, Thomas Dos’Santos, Timothy Suchomel, Paul Jones i John McMahon. "Changes in Dynamic Strength Index in Response to Strength Training". Sports 6, nr 4 (19.12.2018): 176. http://dx.doi.org/10.3390/sports6040176.
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The primary aim of this investigation was to determine the effects of a four-week period of in-season strength training on the dynamic strength index (DSI). Pre and post a four-week period of strength-based training, twenty-four collegiate athletes (age = 19.9 ± 1.3 years; height = 1.70 ± 0.11 m; weight 68.1 ± 11.8 kg) performed three isometric mid-thigh pulls and countermovement jumps to permit the calculation of DSI. T-tests and Cohen’s effect sizes revealed a significant but small (p = 0.009, d = 0.50) decrease in DSI post-training (0.71 ± 0.13 N·N−1) compared to pre-training (0.65 ± 0.11 N·N−1); however, when divided into high and low DSI groups, differential responses were clear. The low DSI group exhibited no significant or meaningful (p = 1.000, d = 0.00) change in DSI pre to post-training (0.56 ± 0.05 N·N−1, 0.56 ± 0.09 N·N−1, respectively), whereas the high DSI group demonstrated a significant and large decrease (p = 0.034, d = 1.29) in DSI pre to post-training (0.85 ± 0.05 N·N−1, 0.74 ± 0.11 N·N−1, respectively), resulting in a significant and moderate difference (p = 0.034, d = 1.29) in the change in DSI between groups. These results demonstrate that DSI decreases in response to strength training, as expected, due to an increase in isometric mid-thigh pull peak force, with minimal change in dynamic (countermovement jump) peak force.
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Stares, Jordan, Brian Dawson, Jarryd Heasman i Brent Rogalski. "Relationship between pre-season strength and power measures and performance in elite Australian football". International Journal of Performance Analysis in Sport 15, nr 3 (grudzień 2015): 777–93. http://dx.doi.org/10.1080/24748668.2015.11868830.
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Lehnert, Michal, Petr Stastny, James J. Tufano i Pavel Stolfa. "Changes in Isokinetic Muscle Strength in Adolescent Soccer Players after 10 Weeks of Pre-Season Training". Open Sports Sciences Journal 10, nr 1 (28.04.2017): 27–36. http://dx.doi.org/10.2174/1875399x01710010027.
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Background:During soccer-specific movements, the strength of knee extensors and flexors is of great importance and achieving certain strength ratios between the two has been identified as an important parameter for reducing the risk of soft tissue injuries around the knee.Objective:The aim of the study was to evaluate changes in isokinetic strength of the knee flexors and extensors and their strength ratios in elite adolescent soccer players.Methods:Before and after 10 weeks of standard pre-season soccer training with progressive eccentric hamstring exercises, the players (n=18; age 17.1±0.4 years) participated in isokinetic testing to assess concentric and eccentric peak torque at 60°·s-1.Results:After 10 weeks of training, the peak eccentric torque of the non-dominant quadriceps increased (p=0.018; ω=0.24). Additionally, the average eccentric work increased in the dominant hamstrings (p=0.007; ω=0.23), dominant quadriceps (p=0.02; ω=0.31), non-dominant hamstrings (p=0.003; ω=0.25 and non-dominant quadriceps (p=0.01; ω=0.37). Lastly, the isokinetic functional ratio (eccentric hamstrings-to-concentric quadriceps) increased in favor of eccentric hamstring strength in the non-dominant limb (p=0.04; ω=0.31).Conclusion:The results of the study indicate that pre-season training induced suboptimal changes in the isokinetic strength of the knee flexors and extensors in elite adolescent soccer players. However, the lack of injuries combined with an apparent lack of preparedness explained by slow velocity isokinetic testing indicates that future research should investigate other forms of strength testing to determine soccer-specific preparedness such as isokinetic dynamometry at higher speeds (i.e.180°.s-1or 240°.s-1) and traditional weight-room testing such as 1RM tests.
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Kale, M., i B. Gurol. "Effects of electromyostimulation training on jumping and muscle strength in football players". Physical education of students 23, nr 5 (26.10.2019): 242–48. http://dx.doi.org/10.15561/20755279.2019.0505.
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Purpose: Electromyostimulation is a popular training to increase muscle strength during the last years. The aim of this study was to investigate effects of electromyostimulation training on jumping and muscle strength in football players. Material: Volunteered 23 football players between the ages of 18 to 24 were divided into experimental and control groups with simple random sampling. Both groups continued to regular training. Experimental group had additional electromyostimulation training for 6-week, 3-time a week, and 20min a day. Pre- and post-training squat and countermovement jumps, peak torques of dominant and non-dominant knee extensor and flexor muscles were tested. Angular velocities of isokinetic dynamometer were 60, 180, and 300ºs-1. Pre- and post-test comparisons within the groups were analyzed. Results: There were no significant differences between pre- and post-test for isokinetic knee strength parameters at all angular velocities of EG. However, control group had significant pre- and post-test differences in dominant and non-dominant knee extension and flexion peak torque values. Conclusions: EMS and regular training in-season had no effect on the isokinetic strength parameters. On the other hand, the regular training in-season has increased isokinetic strength. Electromyostimulation training additional to regular training may have detrimental effects on outcomes of concurrent training in football players.
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McCormack, Sam, Ben Jones i Kevin Till. "Training Practices of Academy Rugby League and their Alignment to Physical Qualities Deemed Important for Current and Future Performance". International Journal of Sports Science & Coaching 15, nr 4 (13.05.2020): 512–25. http://dx.doi.org/10.1177/1747954120924905.
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This study aimed to investigate rugby league coaches’ perceptions of physical qualities for current and future performance, while also establishing the training practices of under-16 and under-19 players. Twenty-four practitioners (rugby coach, strength and conditioning coach) working within nine Super League clubs completed a questionnaire. The questionnaire required practitioners to rank eleven physical qualities (i.e. strength, power, acceleration, maximum speed, aerobic endurance, change of direction, agility, height, body mass, lean mass and fat mass) by importance for current performance, future performance and career longevity according to playing position (forwards, backs, hookers and halves). Practitioners were asked to provide detail on the frequency and duration of each type of training session completed during a typical week throughout each phase of the season; pre-season, in-season (early), in-season (mid) and in-season (late). Typically, practitioners ranked strength, power and acceleration qualities highest, and endurance and anthropometric qualities lowest. The importance of physical qualities varied according to each playing level and position. Training practices of under-16 and under-19 players differed during each phase of the season, with under-19 players undertaking greater training volumes than under-16s players. Overall, the physical qualities coaches perceived as most important were not reflected within their training practices. Rugby league practitioners can use this information as a reference source to design long term athletic development plans, prescribe training and during player development procedures. Moreover, these data can inform and improve training practices while influencing the design of pre-season preparatory phases and in-season periods.
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Varley, Ian, Julie Greeves i Craig Sale. "Seasonal Difference in Bone Characteristics and Body Composition of Elite Speed Skaters". International Journal of Sports Medicine 40, nr 01 (27.11.2018): 9–15. http://dx.doi.org/10.1055/a-0767-6924.
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AbstractWe investigated the changes in bone characteristics and body composition of elite speed skaters across two competitive seasons. Twelve elite speed skaters (age 23±4 years; height 1.73±0.09 m; body mass 68.5±8.8 kg; mean±1 SD) were assessed by DXA and pQCT for Bone Mineral Density (BMD), Bone Mineral Content (BMC), area, bone strength, cortical thickness and density at four points over the course of four competitive seasons. Body composition data was also collected. A main effect of time was shown for whole body BMC, right leg BMC, and trabecular area (P<0.05). Whole body BMC was higher during pre-season and end of season in comparison to mid-season (1.0%, P=0.007; 0.8%, P=0.017), right leg BMC was higher at the pre-season scan in comparison to the post pre-season scan (1.8%,P=0.020) and trabecular area was higher during the mid-season and end of season when compared to the pre-season (1.4%, P=0.012; 1.0%, P=0.003). Seasonal changes in bone characteristics and body composition are shown in elite speed skaters over a competitive season. The changes are thought to be a result of fluctuations in training load. These data may have implications for training design and injury risk management in elite sport.
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Shield, A. "PREVIOUS HAMSTRING INJURY REDUCES PRE-SEASON IMPROVEMENTS IN ECCENTRIC STRENGTH IN ELITE AUSTRALIAN FOOTBALL PLAYERS". British Journal of Sports Medicine 48, nr 7 (11.03.2014): 660.2–660. http://dx.doi.org/10.1136/bjsports-2014-093494.268.
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Bourne, Matthew Noel, Morgan Williams, Ryan Timmins i Tania Pizzari. "Pre-season Hip/groin Strength Is Associated With Subsequent Injury In Professional Male Soccer Players". Medicine & Science in Sports & Exercise 52, nr 7S (lipiec 2020): 671. http://dx.doi.org/10.1249/01.mss.0000682468.17632.da.
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Booth, Mark, Stephen Cobley, Mark Halaki i Rhonda Orr. "Is training age predictive of physiological performance changes in developmental rugby league players? A prospective longitudinal study". International Journal of Sports Science & Coaching 15, nr 3 (21.04.2020): 306–15. http://dx.doi.org/10.1177/1747954120919909.
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The aim of this study was to determine if training age – rugby league training age, resistance training age and cardiovascular training age – was predictive of changes in physiological performance in developmental rugby league players. Developmental rugby league players from one elite club ( n = 147, mean age = 15.8 ± 1.1 years) playing at Under 16 and Under 18 representative levels were tracked longitudinally over two consecutive seasons. Estimated aerobic capacity, jump height, upper body strength endurance and change of direction were assessed. Mixed method random effect analysis determined relationships between training age domains and physiological change. Positive relationships were observed between rugby league training age and change in estimated V̇O2max ( β = 0.13, p = 0.018), and change in strength endurance ( β = 0.51, p = 0.033), and resistance training age and change in jump height ( β = 0.11, p = 0.007). A negative relationship was observed between rugby league training age with change in change of direction time ( β = –0.06, p = 0.026). Moderate pre-season training effect sizes were identified for change of direction (effect size = –0.42, confidence interval (CI) = –0.8 to 0.1) and jump height (effect size = 0.41, CI = 0.1–0.7), while small pre-season training effect size was apparent for strength endurance (effect size = 0.33, CI = 0.0–0.7) and estimated V̇O2max (effect size = 0.16). Small in-season performance decrements occurred in strength endurance (effect size = –0.23, CI = –0.6 to 0.1) and change of direction (effect size = 0.30, CI = –0.1 to 0.7). Higher pre-study rugby league training age was associated with greater improvements in estimated V̇O2max, strength endurance and change of direction. Additionally, higher resistance training age was associated with greater improvements in vertical jump. Overall, the magnitude of resistance training age and cardiovascular training age may have been too inadequate to meaningfully impact training adaptations in the population. Decrease in effect size for physiological performance changes during the in-season phase suggests that performance enhancements were not maintained across the competitive season.
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Silva, Rui, Ricardo Lima, Miguel Camões, César Leão, Sérgio Matos, Joel Pereira, Pedro Bezerra i Filipe Manuel Clemente. "Physical fitness changes among amateur soccer players: effects of the pre-season period". Biomedical Human Kinetics 13, nr 1 (1.01.2021): 63–72. http://dx.doi.org/10.2478/bhk-2021-0009.
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Abstract Study aim: To assess changes in physical fitness of amateur soccer players after a pre-season training period and baseline fitness dependencies. Material and methods: Twenty-one amateur soccer players were assessed during the pre-season. The following physical variables were assessed before and after a two-month pre-season training period: (i) cardiorespiratory fitness, (ii) strength and power, and (iii) change of direction (COD). Results: Significant decreases were found for countermovement jump (CMJ) (p < 0.001; d = 1.161), drop jump (DJ) (p = 0.014; d = 0.958), and horizontal jump (HJ) (p = 0.042; d = 0.640), while no significant changes were found for the overall variables from the beginning to the end of pre-season. Fit players revealed significant decreases for CMJ (p = 0.002; d = –2.495), DJ (p = 0.004; d = –1.760), HJ (p = 0.028; d = –1.005), COD deficit (p = 0.034; d = 1.013), and maximal aerobic speed (MAS) (p = 0.026; d = –4.053). No significant changes were found for unfit players. Conclusions: Amateur soccer coaches should consider assessing physical qualities at the beginning of pre-season and use the free-of-charge monitoring tools such as session-rate of perceived exertion (s-RPE) during the training process.
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Sawyer, Jason, Paul Higgins, Paul A. Cacolice i Troy Doming. "Bilateral back squat strength is increased during a 3-week undulating resistance training program with and without variable resistance in DIII collegiate football players". PeerJ 9 (24.09.2021): e12189. http://dx.doi.org/10.7717/peerj.12189.
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Background Optimizing training adaptations is of the utmost importance for the strength and conditioning professional. The pre-season of any sport is particularly important to ensure preparedness of the athletes. In DIII Collegiate Football pre-season consists of approximately 3 weeks. The abbreviated time of the pre-season increases the importance of optimizing training using safe methods, including alternative loading strategies. The purpose of the current study was to determine if a 3-week variable resistance training VRT during an undulating (UL) resistance training program elicited a greater increase in back squat strength compared to traditional loading methods. Methods and Materials Forty DIII Football players (age range: 18–25 years) participated in a 3-week UL bilateral back squat (BBS) program. Both groups performed the BBS 3 times per week with a minimum of 24 hours between exercise sessions. The control group (C) (n = 20) (height = 182.3 + 5.1 cm, body mass: pre = 102.8 ± 17.7 kg, post = 104.1 ± 17.8 kg) used traditional loading methods (i.e., Olympic weights only) and the experimental group (E) (n = 20) (height = 180.7 ± 8.0 cm, body mass: pre = 100.3 ± 27.1 kg, post = 101.0 ± 27.7 kg) used traditional loading methods and variable resistance (i.e., resistance bands). The variable resistance accounted for approximately 20% of the total resistance while 80% of the resistance was supplied by traditional loading methods. Results When all data was pooled, subjects had a significant increase (p < 0.05) in 1-RM BBS from pre (154.2 + 26.1 kg) to post (166.8 + 26.2 kg), with a percent increase of 8.13% at the completion of the 3-week training program. There was no significant difference (p > 0.05) between the C and E groups for muscular strength, muscular power, or vertical jump. Volume-loads were not significantly (p > 0.05) different between groups for any of the weeks (C: Week 1 = 858.1 + 101.3, Week 2 = 588.6 + 69.2, Week 3 = 332.5 + 38.9, Total = 1179.2 + 209.4 vs. E: Week 1 = 835.2 + 179.7, Week 2 = 572.2 + 123.4, Week 3 = 323.5 + 68.8, Total = 1730.9 + 371.8) or for the pre-season as a whole. Conclusion A traditional UL resistance training program and training program with variable resistance are both effective methods at increasing back squat strength during 3 weeks of training. Resistance band variable resistance (VR) does not enhance training effects within a 3-week mesocycle greater than traditional resistance.
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Januševičius, Donatas, Audrius Sniečkus, Mantas Mickevičius, Danguolė Satkunskienė, Pornpimol Muanjai i Sigitas Kamandulis. "Integration of High Velocity Elastic Band for Hamstring Training in Pre-Season Routine of Football Players". Baltic Journal of Sport and Health Sciences 4, nr 119 (25.02.2021): 31–39. http://dx.doi.org/10.33607/bjshs.v4i119.1017.
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Background. A need for other methods of hamstring strengthening are thus warranted with the main aim of reducing the risk of injury during the subsequent intense athletic activities. The study aimed to examine changes in hamstring strength in response to high velocity elastic band training when incorporated into regular training routine of football players.
Methods. Research participants were professional top level football players (age 23.1 ± 5.7 years; weight 77.2 ± 7.7 kg, training experience 14.1 ± 5.8 years). In the pre-season, in addition to their routine training, the experimental group performed hamstring curls at maximal intensity while lying prone three times per week for five weeks, while control group continued their routine training. Concentric knee torque at 60°/s and 180°/s angular velocities, countermovement jump height, 30m sprint running performance from standing and flying start, and knee flexion-extension movement frequency were measured before and after the 5 weeks of training.
Results. Hamstring curl frequency during lying prone increase by 10.5 % (p < .05) in the experimental group and did not change in the control group. Peak torque for knee flexion and knee extension, jump height and sprint running performance did not change significantly in any group (p > .05).
Conclusion. High velocity elastic band training incorporated into regular pre-season routine is beneficial for football players to increase their knee extension-flexion maximal movement frequency with no evident effects on strength, jump and sprint running performance. Results might be related with concurrent training during preparatory training phase of the pre-season when several physical capacities are being developed simultaneously.
Keywords: high speed movements; peak torque; sprint performance; prevention of hamstring injuries; knee flexion strength.
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Lehouillier, Frédérique, Marc-Olivier Dugas i Martin Lavallière. "Impact of a Season of Bike Patrol on Police Officers’ Level of Fitness: A Pilot Study". International Journal of Environmental Research and Public Health 18, nr 12 (8.06.2021): 6214. http://dx.doi.org/10.3390/ijerph18126214.
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Bike patrollers must have a good level of fitness to perform their patrolling duties adequately and effectively by bike and accomplish specific work tasks, which may require the use of various physical capacities. However, there is little information on the real workload associated with bike patrol and its impact on health. The purpose of this study was to assess the general physical fitness of police officers before and after a season of bike patrolling and then quantify its effects on each patroller’s health. All six male police officers (29.5 ± 4.3 years old) performed two complete physical fitness evaluations (PRE- and POST-season), which included anthropometric measurements (weight, waist circumference, and body mass index), a push-up test, a sit-up test, a grip strength test, a vertical jump test, a sit-and-reach test, and an aerobic capacity test on a bicycle ergometer. Paired t-tests were used to evaluate the differences in test performance between the PRE- and POST-season. Grip strength, estimated VO2max, and power deployed on the bike all showed significant improvement after the season (p-value 0.0133; 0.007; and 0.003, respectively). No significant differences were found among the evaluation’s other components (p > 0.05). Results show the workload associated with a bike patrol season caused a considerable improvement in grip strength, VO2max, and power deployed on the bike, and might be beneficial for their overall health as a work-integrated avenue to keep the officers fit for duty. Further research on the subject is suggested.
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Rotto, Torsten, Emily Kraus i Michael Fredericson. "A NECK STRENGTH TRAINING PROTOCOL IN HIGH SCHOOL FOOTBALL PLAYERS FOR CONCUSSION RISK REDUCTION". Orthopaedic Journal of Sports Medicine 8, nr 4_suppl3 (1.04.2020): 2325967120S0016. http://dx.doi.org/10.1177/2325967120s00165.
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Background: Increased neck strength may be a protective factor for reducing concussions in youth athletes. However, little research exists regarding validated neck strength training methods among this demographic. Purpose: To determine whether a 7-week neck strength training period is sufficient to achieve significant gains in neck strength and size amongst high school football players. Additionally, to assess if increased neck strength influences concussion outcomes. Methods: This study enrolled 54 male high school football players, ages 14-17, in a 7-week strength training protocol in which neck exercises were incorporated into preseason strength and conditioning workouts (figure 1). Pre- and post-neck strength was assessed in four directions: forward flexion (FF), extension (EXT), right lateral flexion (RLF) and left lateral flexion (LLF). Strength was measured as maximal isometric head pressure applied into a pre-inflated sphygmomanometer cuff (figure 2). Concussion totals from the subsequent 2018 season were compared with totals from the 2017 and 2016 seasons per data obtained from the team’s athletic trainer. Results: Fifty athletes in total were analyzed; 4/54 athletes did not complete final testing due to scheduling conflicts. A two sample t-test of neck circumferences revealed a statistically significant increase of 0.37 cm from pre- to post-neck strength training (p=0.0025, figure 3). Single sample strength t-test analysis (corrected for cuff pre-inflation) demonstrated a statistically significant post-test strength increase of 19.8% (FF), 11.0% (EX), 18.8% (RLF), and 18.0% (LLF) (p<0.001, figure 3). The team suffered 4 concussions in the 2018 season, 2 of which were sustained by athletes who did not participate in preseason neck training, compared to 12 concussions in 2017 and 7 concussions in 2016 (figure 3). Conclusion This study demonstrates that increases in neck size and strength can be achieved amongst high school athletes using easily implemented training methods during a 7-week preseason training period. The additional observation of reduced concussion outcomes is not conclusive, though these initial results are promising. Additional research is needed to investigate the potential of neck strengthening in modifying concussion risk. Funding provided by the Stanford Medical Scholars Fellowship Program [Figure: see text][Figure: see text][Figure: see text]
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Martin, Manuel Santiago, Fernando Pareja Blanco i Eduardo Saez De Villarreal. "Effects of Different In-Season Strength Training Methods on Strength Gains and Water Polo Performance". International Journal of Sports Physiology and Performance 16, nr 4 (1.04.2021): 591–600. http://dx.doi.org/10.1123/ijspp.2020-0046.
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Purpose: This study aimed to compare the effects of 5 different 18-week in-season strength training programs on strength gains and specific water polo performance. Methods: A total of 56 young male water polo players were randomly assigned to the following 5 training groups: dry-land strength training, in-water-specific strength training, combined (dry-land and in-water) strength training, ballistic training, and eccentric-overload training. Physical performance was assessed before (Pre) and after (Post) the training period using the following battery of tests: in-water boost and countermovement jump, muscle strength in bench-press and full-squat, throwing speed (ThS), in-water agility, and 20-m maximal sprint swim. Results: Significant group × time interactions were observed for countermovement jump and in-water boost. Eccentric-overload training showed significantly higher gains in ThS and bench-press and full-squat strength than the rest of the training groups. In addition, all training groups (except in-water-specific strength training) induced significant improvements (P ≤ .05) in countermovement jump, in-water boost, and bench-press and full-squat strength. All training groups significantly increased (P ≤ .001) ThS. Moreover, all training groups improved (P ≤ .05) in-water agility (except dry-land strength training) and swimming sprint performance (except in-water-specific strength training and ballistic training). Conclusion: The findings indicate that the 18-week in-season strength training programs induced improvements in strength and specific water polo skills. The eccentric-overload training resulted in greater improvements in muscle strength (in both upper and lower body) and ThS than the other training methods examined in the study.
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Bourne, M., M. Williams, R. Timmins i T. Pizzari. "Pre-season hip/groin strength and HAGOS scores are associated with subsequent injury in professional soccer players". Journal of Science and Medicine in Sport 22 (październik 2019): S60—S61. http://dx.doi.org/10.1016/j.jsams.2019.08.259.
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Stone, Kathryn, John Barden, Michael Kennedy i Robert Kell. "Pre-season Improvements In Economy, Cardiorespiratory Function And Strength Exhibited In An Elite Multi-sport Endurance Athlete". Medicine & Science in Sports & Exercise 43, Suppl 1 (maj 2011): 105–6. http://dx.doi.org/10.1249/01.mss.0000402988.49948.69.
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Gannon, Edward A., Keith A. Stokes i Grant Trewartha. "Strength and Power Development in Professional Rugby Union Players Over a Training and Playing Season". International Journal of Sports Physiology and Performance 11, nr 3 (kwiecień 2016): 381–87. http://dx.doi.org/10.1123/ijspp.2015-0337.
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Purpose:To investigate strength and power development in elite rugby players during the different phases of a professional season.Methods:Sixteen professional rugby union athletes from an English premiership team were monitored for measures of lower-body peak force, force at 50 ms, force at 100 ms (all isometric squat), and power (explosive hack squat). Athletes were assessed at the start of preseason (T1), postpreseason (T2), midway through the competitive season (T3), and at the end of the competitive season (T4). Effect-size (ES) statistics with magnitude-based inferences were calculated to interpret differences in physical performance between the different stages of the season.Results:Very likely beneficial increases in force at 50 ms (+16%, ES = 0.75 ± 0.4) and 100 ms (+14%, ES = 0.63 ± 0.4) were observed between T1 and T2. A likely beneficial increase in power was observed between T2 and T3 (+4%, ES = 0.31 ± 0.2). Between T3 and T4, decreases in force at 50 ms (–6%, ES = –0.39 ± 0.3) and 100 ms (–9%, ES = –0.52 ± 0.4) occurred, while peak force and power were maintained. Over the full season (T1–T4) clear beneficial increases in all measures of strength and power were identified.Conclusions:Meaningful increases in strength and power can be achieved in professional English premiership rugby players over a full playing season. The greatest opportunity for strength and power development occurs during pre- to midseason phases, while these measures are maintained or decrease slightly during the latter stages of a season.
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Carvalho, Alberto, Scott Brown i Eduardo Abade. "Evaluating injury risk in first and second league professional Portuguese soccer: muscular strength and asymmetry". Journal of Human Kinetics 51, nr 1 (1.06.2016): 19–26. http://dx.doi.org/10.1515/hukin-2015-0166.
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AbstractStrength imbalances between the hamstrings and quadriceps are an essential predictor for hamstring strain in soccer. The study aimed to investigate and compare the muscle strength imbalances of professional soccer players of different performance levels. One hundred and fifty nine senior male professional soccer players from first (n = 75) and second league (n = 84) Portuguese clubs participated in this study. Muscle strength was evaluated with a REV9000 isokinetic dynamometer. Maximal peak torque data were used to calculate quadriceps and hamstrings strength during concentric and eccentric actions, bilateral asymmetry, conventional strength ratios and dynamic control ratios. Second league athletes produced slightly lower conventional strength ratios in the right and left legs (ES = 0.22, p = 0.17 and ES = 0.36, p = 0.023, respectively) compared to the first league athletes. No significant differences were found in dynamic control ratios or in bilateral asymmetry among first and second league athletes. These findings do not show a clear link between the competitive level and injury risk in soccer players. However, some of the differences found, particularly in conventional strength ratios, highlight the importance of performing off-season and pre-season strength assessments to prescribe and adjust individual strength training programs among professional soccer players.
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Suarez-Arrones, Luis, Pilar Lara-Lopez, Rafael Maldonado, Nacho Torreno, Moises De Hoyo, Fabio Yuzo Nakamura, Valter Di Salvo i Alberto Mendez-Villanueva. "The effects of detraining and retraining periods on fat-mass and fat-free mass in elite male soccer players". PeerJ 7 (13.08.2019): e7466. http://dx.doi.org/10.7717/peerj.7466.
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The aim of the study was to examine the effects of a detraining period (DTP) (i.e., off-season) with an individually prescribed training program, and a retraining period (RTP) (i.e., pre-season) combining soccer and flywheel-based strength training on fat-free mass (FFM) and fat-mass (FM) in 10 elite professional male soccer players. The present study used a controlled repeated-measures research design to investigate the changes in FFM and FM using dual-energy X-ray absorptiometry. Whole body %FM increased (effect size (ES) = 0.87 ± 0.46) and FFM reduced after DTP (ES = −0.30 ± 0.19), returning to values comparable to the end of the previous season after RTP. At regional levels, arms, legs, and trunk %FM increased (ES = from 0.42 to 1.29) while trunk-FFM was reduced (ES = −0.40 ± 0.26) after DTP, returning to the values observed at the end of the previous season after RTP. Legs-FFM did not change after DTP, with a substantial increase after RTP in comparison with pre-season values (ES = 0.34 ± 0.29 and 0.53 ± 0.36 for the right and left leg, respectively). Despite the small sample size of the present study, the findings indicate that elite soccer players can be allowed 2 weeks of rest during a five-week DTP, since the changes in %FM and FFM were relatively small, and FM and FFM returned to the optimal initial values for competition after the proposed RTP during the pre-season.
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Lacome, Mathieu, Simon Avrillon, Yannick Cholley, Ben M. Simpson, Gael Guilhem i Martin Buchheit. "Hamstring Eccentric Strengthening Program: Does Training Volume Matter?" International Journal of Sports Physiology and Performance 15, nr 1 (1.01.2020): 81–90. http://dx.doi.org/10.1123/ijspp.2018-0947.
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Aim: To compare the effect of low versus high volume of eccentric-biased hamstring training programs on knee-flexor strength and fascicle length changes in elite soccer players. Methods: A total of 19 elite youth soccer players took part in this study and were randomly assigned into 2 subgroups. For 6 weeks in-season, the groups performed either a low-volume (1 set per exercise; 10 repetitions in total) or a high-volume (4 sets; 40 repetitions) eccentric training of their knee flexors. After 6-weeks midtraining (MID), players performed the alternate training regimen. Each training set consisted of 4 repetitions of the Nordic hamstring exercise and 6 repetitions of the bilateral stiff-leg deadlift. Eccentric knee-flexor strength (NordBord) as well as biceps femoris long head and semimembranosus fascicle length (scanned with ultrasound scanner) were assessed during pretraining (PRE), MID, and posttraining (POST) tests. Results: Knee-flexor eccentric strength very likely increased from PRE to MID (low volume: +11.3% [7.8%] and high volume: 11.4% [5.3%]), with a possibly-to-likely increase in biceps femoris long head (+4.5% [5.0%] and 4.8% [2.5%]) and semimembranosus (+4.3% [4.7%] and 6.3% [6.3%]) fascicle length in both groups. There was no substantial changes between MID and POST. Overall, there was no clear between-group difference in the changes from PRE to MID and MID to POST for neither knee-flexor eccentric strength, biceps femoris long head, nor semimembranosus fascicle length. Conclusions: Low-volume knee-flexor eccentric training is as effective as a greater training dose to substantially improve knee-flexor strength and fascicle length in-season in young elite soccer players. Low volume is, however, likely more appropriate to be used in an elite team facing congested schedules.
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Dudley, Jonathan A., Jed A. Diekfuss, Weihong Yuan, Kim D. Barber Foss, Christopher A. DiCesare, Kelsey Logan, James L. Leach i Gregory D. Myer. "ALTERED BRAIN FUNCTIONAL CONNECTIVITY FOLLOWING A SEASON OF COMPETITIVE FEMALE HIGH SCHOOL SOCCER AND THE EFFECT OF A JUGULAR VEIN COMPRESSION COLLAR: A NETWORK-BASED STATISTICS ANALYSIS". Orthopaedic Journal of Sports Medicine 8, nr 4_suppl3 (1.04.2020): 2325967120S0026. http://dx.doi.org/10.1177/2325967120s00268.
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Background: Cumulative exposure to repetitive sub-concussive head impacts in contact sports may have deleterious effects on brain function, even in the absence of acute symptoms. Moreover, anatomical and biomechanical factors may predispose female athletes to higher risk compared to males. At present, there is no effective injury prevention strategy to protect female athletes from sports-related head impact. Hypothesis/Purpose: (1). We aimed to use resting-state fMRI to investigate the effect of a full season of competitive soccer on brain functional network integrity in female high school athletes. (2). We also aimed to evaluate the efficacy of a jugular vein compression neck collar device, designed to mitigate potential injury by reducing the brain slosh effect. Methods: A total of 125 high school female soccer athletes were included in this study. These athletes were assigned randomly to a non-collar (n=55, age=16.06±1.06 yrs) or collar group (n=70, 15.81±0.95 yrs) before the season started. High resolution 3D T1-weighted images and resting-state fMRI data were collected prospectively at pre-season and again at post-season. Data processing and analysis were conducted in the MATLAB-based programs Statistical Parametric Mapping (SPM12) and Connectivity Toolbox (Conn). Functional connectivity was computed between each pair of 105 anatomically delineated regions of interest (ROI). Network Based Statistics were applied to detect coherent patterns of altered connectivity from pre- to post-season. Results: The non-collar group showed a significant pattern of altered connectivity (p-FWE = 0.047) spanning 60% of ROIs (63/105) and 1.7% of ROI-ROI connections (94/5,460). 65 of the 94 altered connections were weakened from pre-to-post season and tended to occur in the right hemisphere. 29 of the 94 altered connections were strengthened from pre-to-post season and tended to involve regions in the occipital lobe. The collar group did not show any statistically significant change (p-FWE = 0.223). Conclusion: The results of this study indicate that exposure to repetitive sub-concussive head impacts during a single season of competitive female soccer induces changes in brain functional connectivity. The observed increases and decreases of functional connectivity strength comprising the pattern of altered connectivity are congruent with a heterogeneous response to insult wherein some connections are reduced in strength due to neuronal damage and other “detour” connections are strengthened to preserve network function. Comparatively, the absence of alterations in the collar group suggest that the jugular vein compression collar may have generated a potentially protective effect to preserve brain functional network integrity during exposure to head impacts. [Figure: see text]
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Augustsson, Sofia Ryman. "Maximum Strength in Squats Determines Jumping Height in Young Female Volleyball Players". Open Sports Sciences Journal 6, nr 1 (20.08.2013): 41–46. http://dx.doi.org/10.2174/1875399x01306010041.
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Few data exist on the relationship between maximum strength and power performance, such as jumping ability in low-level female volleyball players. The aim of the present study was to determine the relationship between maximum strength and jumping performance in young female non-elite volleyball players before and after an in-season resistancetraining protocol. A 26-week, in-season resistance-training program was carried out on ten female volleyball players, aged 19 (±2). The 1 RM squat test was used to evaluate the players’ maximum strength in the lower extremities and a vertical jump (VJ) test was used to assess functional performance and power. There was a significant enhancement of 69% (p=0.005) for the squat test and 9% for the VJ test (p=0.008). A strong significant relationship was found between the VJ test and the 1 RM squat test (r=0.68, r2=0.47, p=0.0014) at the pre-test and post-test (r=0.88, r2=0.77, p=0.001). When comparing the coefficients of correlation (r=0.68 and r=0.88) between the squat tests and VJ tests, the difference that was noted was significant (p<0.001). A strong significant relationship was also noted between the 1RM squat and VJ test relative to body weight at pre-test (r=0.89, r2=0.79, p=0.001) and post-test (r=0.95, r2=0.90), p<0.001). This study demonstrates that maximum strength in squats is a major predictive factor for jumping height in young female volleyball players. Female volleyball players might therefore consider focusing on maximum strength training to improve their jumping performance.
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Stolbova, V., P. Martin, B. Bookhagen, N. Marwan i J. Kurths. "Topology and seasonal evolution of the network of extreme precipitation over the Indian subcontinent and Sri Lanka". Nonlinear Processes in Geophysics 21, nr 4 (29.08.2014): 901–17. http://dx.doi.org/10.5194/npg-21-901-2014.
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Abstract. This paper employs a complex network approach to determine the topology and evolution of the network of extreme precipitation that governs the organization of extreme rainfall before, during, and after the Indian Summer Monsoon (ISM) season. We construct networks of extreme rainfall events during the ISM (June–September), post-monsoon (October–December), and pre-monsoon (March–May) periods from satellite-derived (Tropical Rainfall Measurement Mission, TRMM) and rain-gauge interpolated (Asian Precipitation Highly Resolved Observational Data Integration Towards the Evaluation of Water Resources, APHRODITE) data sets. The structure of the networks is determined by the level of synchronization of extreme rainfall events between different grid cells throughout the Indian subcontinent. Through the analysis of various complex-network metrics, we describe typical repetitive patterns in North Pakistan (NP), the Eastern Ghats (EG), and the Tibetan Plateau (TP). These patterns appear during the pre-monsoon season, evolve during the ISM, and disappear during the post-monsoon season. These are important meteorological features that need further attention and that may be useful in ISM timing and strength prediction.
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Quinney, H. A., Randy Dewart, Alex Game, Gary Snydmiller, Darren Warburton i Gordon Bell. "A 26 year physiological description of a National Hockey League team". Applied Physiology, Nutrition, and Metabolism 33, nr 4 (sierpień 2008): 753–60. http://dx.doi.org/10.1139/h08-051.
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The primary purpose of this investigation was to examine the physiological profile of a National Hockey League (NHL) team over a period of 26 years. All measurements were made at a similar time of year (pre-season) in 703 male (mean age ± SD = 24 ± 4 y) hockey players. The data were analyzed across years, between positions (defensemen, forwards, and goaltenders), and between what were deemed successful and non-successful years using a combination of points acquired during the season and play-off success. Most anthropometric (height, mass, and BMI) and physiological parameters (absolute and relative VO2 peak, relative peak 5 s power output, abdominal endurance, and combined grip strength) showed a gradual increase over the 26 year period. Defensemen were taller and heavier, had higher absolute VO2 peak, and had greater combined grip strength than forwards and goaltenders. Forwards were younger and had higher values for relative VO2 peak. Goaltenders were shorter, had less body mass, a higher sum of skinfolds, lower VO2 peak, and better flexibility. The overall pre-season fitness profile was not related to team success. In conclusion, this study revealed that the fitness profile for a professional NHL ice-hockey team exhibited increases in player size and anaerobic and aerobic fitness parameters over a 26 year period that differed by position. However, this evolution of physiological profile did not necessarily translate into team success in this particular NHL franchise.
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Bieryla, Kathleen A., Jeremy A. Cook i Ryan C. Snyder. "Class Year Differences in Anthropometric and Fitness Measures in Division I Field Hockey Athletes Pre and Post Season". Applied Sciences 11, nr 17 (31.08.2021): 8103. http://dx.doi.org/10.3390/app11178103.
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The purpose of this study was to investigate the way in which anthropometric and fitness measures vary by class year before and after a Division I female field hockey competitive season. Anthropometric (mass and percent body fat) and fitness measures (vertical jump and Yo-Yo Intermittent Recovery Test 1 (Yo-Yo IR1) distance) were collected on 16 athletes (mean ± SD: age = 19.5 ± 0.9 years) before and after a competitive season. Class year, based on the athlete’s year in college, was used to group athletes in the study. Body mass, vertical jump height, and Yo-Yo IR1 distance all increased pre to post season (p < 0.05). First-year athletes had a significantly lower body mass, vertical jump height and Yo-Yo IR1 distance compared to other class years across the testing period (p < 0.05). Post season levels for first-years were lower than both pre and post season levels for sophomore or junior athletes. Team mean vertical jump increased 8.9%, with all but two athletes improving. Team mean Yo-Yo IR1 distance increased 16.4%. Athlete training over the course of the study was designed to improve on field playing performance and training was not directly select to improve measures in the study; therefore, the potential success of integrating fitness, speed, and strength development into technical training sessions is indicated. Coaches should be aware that first-year athletes may not be at the same level of conditioning as sophomores and juniors. Coaches should work specifically with the first-year athletes during the season to monitor their fitness levels.
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Bağış, Yunus Emre. "Comparison of Strength Values of Professional Footballers According to Their Positions before Football Season". Journal of Educational Issues 6, nr 1 (28.06.2020): 395. http://dx.doi.org/10.5296/jei.v6i1.17133.
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The purpose of the present study was to compare the strength values of professional footballers according to their positions before the football season. The study group consisted of 27 professional footballers of Şanlıurfaspor Football Club in the 2nd League of Turkey. The mean height of the Study Group was 180.92±6.18 (cm), mean body weight was 80.18±1.5 (kg), and the mean age was 26.40±4.4 (years). The inclusion criteria for the study was being volunteers, and the necessary permissions were obtained from the players, club managers and coaches. The Precor-brand device was used to measure the differences of strengths according to the positions of the footballers. “1 RM” measurements were made from shoulder press, latt pully, leg curl, leg extension, and leg press machines in the footballers. The SPSS 24.00 Program was used in the statistical analysis of the study data. The descriptive statistics were given as mean, standard deviation, and minimum and maximum values. The normality test of the data was analyzed with the Shapiro-Wilk Test. One-Way Anova Test was used to identify the differences between the players and the positions. The significance level was determined as 0.05. According to the results obtained in the study, no significant differences were detected in strength values between goalkeeper, defender, midfielder, and striker positions (p > 0.05). As a result, among the biomotoric properties, strength is important, and quite necessary for a footballer to perform at a high level. These values obtained from 2nd League football players are important for being taken as reference values, and it can be argued that these values obtained in the pre-season prepared the basis for the lack of qualitative differences. In future studies, data that will be obtained from different league levels and training stages will lead to research being considered differently.
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Meszler, B., i M. Váczi. "Effects of short-term in-season plyometric training in adolescent female basketball players". Physiology International 106, nr 2 (czerwiec 2019): 168–79. http://dx.doi.org/10.1556/2060.106.2019.14.
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In this study, we tested the hypothesis that, during the regular in-seasonal basketball training, an additional 7-week plyometric training program improves lower extremity strength, balance, agility, and jump performance in adolescent female basketball players. Eighteen female basketball players less than 17 years of age were randomly assigned into an experimental group (plyometric training) and a control group. Both groups underwent the same basketball training program. Pre- and post-training test periods included quadriceps and hamstring strength, balance, jump performance, and agility measurements. Illinois agility test time (p = 0.000) and quadriceps strength (p = 0.035) increased uniformly in the two groups. Significant group by test period interaction was found for countermovement jump (p = 0.007), and countermovement height reduced significantly in the plyometric training group (p = 0.012), while it remained unchanged in controls. No significant change was found for T agility test, balance, hamstring strength or H:Q ratio. This study shows that the training program used in-season did not improve the measured variables, except for knee extensor strength. It is possible that regular basketball trainings and games combined with high-volume plyometric training did not show positive functional effects because of the fatigue caused by incomplete recovery between sessions.
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Lehnert, Michal, Zuzana Xaverová i Mark De Ste Croix. "Changes in Muscle Strength in U19 Soccer Players During an Annual Training Cycle". Journal of Human Kinetics 42, nr 1 (1.10.2014): 175–85. http://dx.doi.org/10.2478/hukin-2014-0072.
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Abstract The aim of the study was to investigate the seasonal variation in isokinetic strength of the knee flexors and extensors, and conventional (H/QCONV) and functional (H/QFUNC) hamstring to quadriceps strength ratios in highly trained adolescent soccer players. The players (n=11; age 17.8±0.3) were measured at the end of the competitive season (autumn), at the beginning and the end of pre-season (winter) and during the sixth week of a new competitive season. Isokinetic peak torque (concentric and eccentric) was measured at 60°•s-1 in a sitting position with the hip flexed at 100°. The testing range of motion was set from 10 - 90° of knee flexion. The players performed a set of five maximum repetitions for both the dominant and non-dominant leg. Statistically significant differences (p<0.001) between the four seasonal measurements were noted for peak torque of the dominant leg knee flexors in concentric muscle action only. A post hoc analysis revealed a statistically significant increase in peak torque from the 1st to the 4th measurement (p<0.001; d=0.692) and from the 2nd to the 4th (p<0.01; d=0.564). The differences in the changes of peak torque of the knee flexors and extensors depending on type of muscle action and tendencies found in the H/Q ratios throughout the annual training cycle indicate that strength assessment of the knee flexors and extensors and their balance throughout the annual training cycle could be beneficial for elite male adolescent soccer players both in terms of performance and risk of injury.
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Rishiraj, N., i B. Niven. "Male Academy rugby union student-athletes in-season physical anthropometrical and physical performance changes, and comparisons with available data". South African Journal of Sports Medicine 30, nr 1 (9.10.2018): 1–5. http://dx.doi.org/10.17159/2078-516x/2018/v30i1a5577.
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Background: Physical performance demands of the rugby union (RU) game have increased over the past two decades. However, there are little data on these variables concentrating on developing RU players (student-athletes) over a competitive season.
Objectives: To investigate the potential enhancement of two physical anthropometrical and nine physical performance variables of male New Zealand RU Academy student-athletes over a competitive season and compare with similar published data.
Methods: Twenty student-athletes were recruited to the Otago Rugby Football Union (ORFU) two-year Academy Programme. Each week the student-athletes engaged in 25 hours of strength and conditioning training and participated in 15 hours of on-field rugby training with their respective ORFU Premier League team. Assessments sessions were scheduled for the start of the season, in-season, and pre-play-offs (week 31).
Results: Mean data from 20 student-athletes demonstrated a trivial effect size (ES) increase in body weight and skinfold measurements, while a paired t-test (p<0.05) resulted in concurrent significant improvements in lower-body power (ES = large), acceleration (ES = large), speed (10 m sprint, ES = small, 40 m sprint, ES = small), and upper body strength (bench press, ES = large and bench pull, ES = small). A non-significant physical performance improvement, with trivial ES difference, was also noted in anaerobic endurance performance.
Conclusion: Based on these data significant physical performance enhancements were observed during in-season Premier League competition while limiting fatigue and overtraining.
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Prieske, Olaf, Helmi Chaabene, Martijn Gäbler, Michael Herz, Norman Helm, Adrian Markov i Urs Granacher. "Seasonal Changes in Anthropometry, Body Composition, and Physical Fitness and the Relationships with Sporting Success in Young Sub-Elite Judo Athletes: An Exploratory Study". International Journal of Environmental Research and Public Health 17, nr 19 (30.09.2020): 7169. http://dx.doi.org/10.3390/ijerph17197169.
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This exploratory study aimed to monitor long-term seasonal developments in measures of anthropometry, body composition, and physical fitness in young judo athletes, and to compute associations between these measures and sporting success. Forty-four young judoka (20 females, 24 males) volunteered to participate. Tests for the assessment of anthropometry (e.g., body height/mass), body-composition (e.g., lean body mass), muscle strength (isometric handgrip strength), vertical jumping (e.g., countermovement-jump (CMJ) height), and dynamic balance (Y-balance test) were conducted at the beginning and end of a 10-month training season. Additionally, sporting success at the end of the season was recorded for each athlete. Analyses revealed significant time × sex interaction effects for lean-body-mass, isometric handgrip strength, and CMJ height (0.7 ≤ d ≤ 1.6). Post-hoc analyses showed larger gains for all measures in young males (1.9 ≤ d ≤6.0) compared with females (d = 2.4) across the season. Additionally, significant increases in body height and mass as well as Y-balance test scores were found from pre-to-post-test (1.2 ≤ d ≤4.3), irrespective of sex. Further, non-significant small-to-moderate-sized correlations were identified between changes in anthropometry/body composition/physical fitness and sporting success (p > 0.05; −0.34 ≤ ρ ≤ 0.32). Regression analysis confirmed that no model significantly predicted sporting success. Ten months of judo training and/or growth/maturation contributed to significant changes in anthropometry, body composition, and physical fitness, particularly in young male judo athletes.
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Wang, Kemble K., Glenn Boyce, Tracy Peters, Hamish Anderson i Greg Hoy. "Efficacy of Primary Repair in Professional Athletes with Chronic Radial Collateral Ligament Injuries of Thumb Metacarpophalangeal Joint". Journal of Hand Surgery (Asian-Pacific Volume) 24, nr 02 (29.04.2019): 138–43. http://dx.doi.org/10.1142/s2424835519500176.
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Background: Management of grade III injuries of the radial collateral ligament (RCL) of the thumb is controversial. These injuries are often treated with early surgery. However, early surgery may not be practical for the professional athlete. We report on the outcome of delayed primary repair of chronic RCL injuries without the use of tendon grafts or tendon transfers. Methods: Twelve elite professional athletes with 15 soft tissue RCL injuries who underwent delayed surgery (greater than 6 weeks) were included in this study. Athletes were managed with splinting and ongoing play during the sporting season, and underwent surgery at the conclusion of the season. Mean duration from injury to surgery was 5 months. Mean follow-up was 4.2 years after surgery. Patient-report outcome measures including pain, satisfaction rating, and disability of the arm, shoulder and hand (DASH) scores were collected. Examination findings including range of motion, laxity, and grip and pinch strength were also measured. Return-to-play data were collected for all athletes. Results: The RCL was able to be primarily repaired with suture anchors in all cases. All twelve patients were able to return to competitive play at the same pre-injury professional level. Post-operative joint function such as range of motion and laxity were comparable to the unaffected contralateral side, as were grip and lateral pinch strengths. Tip-pinch strength is lower compared to the unaffected side, but is comparable to age and sex-matched reference group. Conclusions: Delayed primary repair of the RCL is a viable option and results in satisfactory long-term outcomes. This option may be more preferable to the professional athlete who wishes to avoid surgery during the sporting season.
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Bowman, Alan K., i J. David Thomas. "A Military Strength Report from Vindolanda". Journal of Roman Studies 81 (listopad 1991): 62–73. http://dx.doi.org/10.2307/300489.
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The text here published has a claim to be the most important military document ever discovered in Britain. It was found during the 1988 season of excavation of the pre-Hadrianic area at Vindolanda. The archaeological context in which it was found is the earliest level in which tablets are present; it was located in the ditch by the west wall of the earliest phase of the fort, beneath four successive buildings of the later periods. The ditch appears to have been filled by A.D. 90/92 and the tablet is therefore most probably to be dated c. A.D. 90 (unless it was part of a deposit of rubbish put into the Period I ditch by the builders of the Period II structures). It would thus reflect the situation at Vindolanda only a few years after Agricola's departure from Britain, presumably just before the enlargement of the fort which made this area the site of the praetorium in the southern sector of the central range of buildings. The small amount of relevant evidence from other writing-tablets confuses rather than clarifies the picture. The commanding officer named in the strength report is Iulius Verecundus and there are five or six other texts associated with a man named Verecundus who may or may not be the same person (in only one case is the gentilicium (Iulius) preserved).
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Hermassi, Souhail, Monoem Haddad, El Ghali Bouhafs, Kevin G. Laudner i René Schwesig. "Comparison of a Combined Strength and Handball-Specific Training vs. Isolated Strength Training in Handball Players Studying Physical Education". Sportverletzung · Sportschaden 33, nr 03 (sierpień 2019): 149–59. http://dx.doi.org/10.1055/a-0919-7267.
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Abstract Objectives The purpose of this study was to compare the effect of combined resistance training including handball-specific drill (CRT) with resistance training excluding handball-specific drill training (NSDT). Materials and methods Twenty-two male handball players who studied physical education were randomly assigned to two groups: CRT (combined resistance training with sport-specific drill; n = 12) and NSDT (resistance training without any sport-specific drill training; n = 10). Over a 10-week period during the competitive season, the players performed a specific training program twice per week, which replaced their normal team handball training. The CRT regimen consisted of a combined (associated) resistance training and handball-specific drill, whereas the NSDT program consisted of a resistance training without handball-specific drill (dissociated). Pre- and post-test measures included squat jump and countermovement jumps, bench press, back half squats, throwing velocity during a 3-step jump throw, and a jump shot, repeated-sprint ability (six 2 × 15-m shuttle sprints) (RSA), medicine ball throw and anthropometric measurements. Results In both groups, significant intervention effects (d ≥ 1.0) were seen for all sprint (3/3), throwing (3/3) and jump (2/2) measures. Regarding maximal strength parameters, an effect size lower than 0.5 was only detected in the NSDT group for half back squats (d = 0.48). The largest effects were observed in the NSDT group for squat jump (d = 6.20) and medicine ball throw (d = 6.07). Interaction effects (group × time) were found for 50 % (5/10) of parameters. The greatest difference between groups regarding performance development over time was detected for jump shot (interaction effect: η² = 0.748). In contrast, there was no difference in performance development in both groups over time for RSAbest (interaction effect: η² = 0.025). Conclusions The current findings suggest that during the competitive season, 10 weeks of CRT with only two training sessions per week improved numerous measures of athletic performance in handball students of physical education. Such conditioning should be highly recommended as part of the annual training program of handball players.
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Ricardo LOPES, Charles. "Effects of Pre-Season Short-Term Daily Undulating Periodized Training on Muscle Strength and Sprint Performance of Under-20 Soccer Players". International journal of Science Culture and Sport 3, nr 10 (1.01.2015): 64. http://dx.doi.org/10.14486/ijscs274.
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Cselkó, Alexandra, Edina Ivett Szabó, Mark Váczi, Tamas Kőszegi, Eva Tékus i Marta Wilhelm. "Relationship between Anthropometric, Physical and Hormonal Parameters among Pre-Pubertal Handball Players". International Journal of Environmental Research and Public Health 18, nr 19 (23.09.2021): 9977. http://dx.doi.org/10.3390/ijerph18199977.
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Background: The aims of our study were to investigate the changes in anthropometric and physical parameters and fasting hormonal levels among pre-pubertal female handball players (n = 14, age: 11.53 ± 0.58 yrs, height: 153.36 ± 5.12 cm, body mass: 43.59 ± 6.14 kg) in the pre-season period following 8 weeks of handball training, and to analyze the contribution of hormones, physical performance and anthropometric parameters. Methods: Prior to and immediately following the training period, several anthropometric, strength, and cardiorespiratory variables, including fasting hormonal concentrations (plasma cortisol, estradiol, testosterone and growth hormones) were measured. Athletes performed concurrent resistance and aerobic exercises, including game-based trainings during the 8-week training period. Results: Significant elevations were found in all strength parameters (maximal handgrip strength dominant (D): 16.40%, p < 0.01; non-dominant (ND): 25.15%, p < 0.05; maximal concentric (MVC) torque of quadriceps D: 13.82%, p < 0.05; ND: 12.61%, p < 0.05; MVC torque of hamstring D: 12.14%, p < 0.01; ND: 12.44%, p < 0.01), including plasma cortisol levels (C, 34.30%, p < 0.05) and peak respiratory quotient (5.24%, p < 0.05). Body composition and maximal oxygen uptake (VO2max) remained unchanged. Percentage changes in thigh (r = 0.316, p < 0.05), hand (r = 0.361, p < 0.05), and hip circumference (r = 0.297, p < 0.05) correlated with C changes. Percentage changes in plasma growth hormone levels (GH) contributed to the magnitude of gains in handgrip strength (r = 0.553, p < 0.05). Percentage changes in maximal exercise pulmonary ventilation (MVE) correlated with elevated C (r = −0.592, p < 0.05). Discussion: Changes in anthropometric variables and fasting hormone levels (estradiol, testosterone and cortisol) were poor indicators of developing VO2max and strength during pre-pubertal years. Physical adaptation may not be explained in consideration of the athletes’ hormonal or anthropometric characteristics. Conclusion: Gradually increased training volume followed by a summer break should be applied to youth handball, considering the anti-hypertrophic responses and the inhibitory effect of elevating C on pre-pubertal maturation.
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Fields, Jennifer, Justin Merrigan, Jason White i Margaret Jones. "Seasonal and Longitudinal Changes in Body Composition by Sport-Position in NCAA Division I Basketball Athletes". Sports 6, nr 3 (22.08.2018): 85. http://dx.doi.org/10.3390/sports6030085.
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The purpose of this study was to assess the body composition of male and female basketball athletes (n = 323) across season, year, and sport-position using air displacement plethysmography. An independent sample t-test assessed sport-position differences. An analysis of variance was used to assess within-subjects across season (pre-season, in-season, and off-season), and academic year (freshman, sophomore, and junior). For both men and women basketball (MBB, WBB) athletes, guards had the lowest body fat, fat mass, fat free mass, and body mass. No seasonal differences were observed in MBB, but following in-season play for WBB, a reduction of (p = 0.03) in fat free mass (FFM) was observed. Across years, MBB showed an increase in FFM from freshman to sophomore year, yet remained unchanged through junior year. For WBB across years, no differences occurred for body mass (BM), body fat (BF%), and fat mass (FM), yet FFM increased from sophomore to junior year (p = 0.009). Sport-position differences exist in MBB and WBB: Guards were found to be smaller and leaner than forwards. Due to the importance of body composition (BC) on athletic performance, along with seasonal and longitudinal shifts in BC, strength and conditioning practitioners should periodically assess athletes BC to ensure preservation of FFM. Training and nutrition programming can then be adjusted in response to changes in BC.
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Bagordo, Andrea, Kimberly Ciletti, Kevin Kemp-Smith, Vini Simas, Mike Climstein i James Furness. "Isokinetic Dynamometry as a Tool to Predict Shoulder Injury in an Overhead Athlete Population: A Systematic Review". Sports 8, nr 9 (8.09.2020): 124. http://dx.doi.org/10.3390/sports8090124.
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Prospective and cross-sectional studies have used pre-season isokinetic dynamometry strength and endurance measurements of shoulder internal rotation (IR) and external rotation (ER) to determine if they can be correlated to injury. However, to date, no review has provided a synthesis of all available literature on this topic. The aim of this systematic review was to identify isokinetic dynamometry studies that assess shoulder IR and ER strength and endurance in the overhead athletic population in relation to shoulder injury. Electronic databases (PubMed, CINAHL, and SportDiscus) were searched through September 2019 using pre-determined search terms. Both prospective and cross-sectional studies were included in this review. Studies were assessed for quality using either Appraisal Tool for Cross-sectional Studies (AXIS) or Critical Appraisal Skills Programme (CASP). Data on outcome measures of strength and endurance peak torque (PT) and ratios (ER:IR) were extracted and further analysed using a best evidence synthesis approach. A total of 13 articles met the inclusion criteria. Conflicting evidence was found when reviewing all studies without differentiating by study type. Prospective study designs revealed strong evidence that reduced IR endurance and reduced strength ratios are predictive of shoulder injury. Cross-sectional literature showed only conflicting and limited evidence for all outcome measures. At this stage, more research is needed in individual sporting populations using prospective cohort designs.
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Konečný, Jan. "Evaluation of the Level of Explosive Power of Lower Limbs of Juniors, Older and Younger Juvenile Players." Studia sportiva 12, nr 2 (3.01.2019): 56–69. http://dx.doi.org/10.5817/sts2018-2-6.
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Abstract:The objective of the study was to determine and compare the level of explosive power of lower limbs of an RTC year-round training routine by taking measurements at the end of a pre-season period (June 2012) and at the peak of active season period (March 2013) before the Playoff peak season. The level of explosive abilities of lower limbs was diagnosed on the Fitro Force Plate. The study was focused on testing explosive-power abilities of both lower limbs, right and left leg. The fundamental objective of the study was to determine and assess the development of strength abilities of three age categories (juniors, older and younger juvenile players of SCM Kometa Group Brno). The results of the study suggest that the development of explosive-power-capabilities is influenced by variety of factors, such as biological age, training and game workload. Finally, during the testing period we found a statistically significant increase in explosive-power abilities in the age category of young juvenile, which we consider to be a key finding.
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Chen, Sun, Zhang, Palta i Deng. "The Proportion of Superior Grains and the Sink Strength are the Main Yield Contributors in Modern Winter Wheat Varieties Grown in the Loess Plateau of China". Agronomy 9, nr 10 (5.10.2019): 612. http://dx.doi.org/10.3390/agronomy9100612.
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Understanding the changes in phenotype resulting from the selection pressure and agronomic adaptation of grain yield provide an indication of the pathways for future increases in grain yield. Six dry land representative winter wheat cultivars (Triticum aestivum L.) released from 1942 to 2004 in the Loess Plateau of China were investigated to determine how the yield components of winter wheat were associated with grain yield at the Changwu Agricultural Research Station during the 2011–2012 and 2012–2013 seasons, using a completely randomized block design with three replicates. Plant height, aboveground biomass, grain yield, and yield components were measured, together with the traits of superior and inferior grains and the pre-anthesis stored dry matter remobilized to the grain was determined. In the relatively wet 2011–2012 season, there was a significant increase in grain yield and aboveground biomass with the year of release, but not in the dry 2012–2013 season. The harvest index (HI) and average grain weight (AGW) increased significantly with the year of release in both cropping seasons. HI and AGW are likely potential traits for improving grain yield of winter wheat in the Loess Plateau. The increase in HI mainly resulted from the decrease in plant height, and the increase in the use of pre-anthesis stored assimilates for grain filling. The increase in AGW mainly resulted from the increase in the proportion of superior grain (SG) and the decrease in the proportion of inferior grain (IG) in the whole spike in both cropping seasons. Depending on the climatic conditions, the different winter wheat cultivars showed different ability to use pre-anthesis stored assimilates. Modern wheat cultivars had higher yield under different rainfall conditions, and high ability to use pre-anthesis stored assimilates to fill the grain than earlier released cultivars. Both, the increase in sink capacity and source availability, should be considered as a strategy for increasing future grain yield in Loess Plateau of China.
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Cuthbert, Matthew, G. Gregory Haff, Shawn M. Arent, Nicholas Ripley, John J. McMahon, Martin Evans i Paul Comfort. "Effects of Variations in Resistance Training Frequency on Strength Development in Well-Trained Populations and Implications for In-Season Athlete Training: A Systematic Review and Meta-analysis". Sports Medicine 51, nr 9 (22.04.2021): 1967–82. http://dx.doi.org/10.1007/s40279-021-01460-7.
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Abstract Background In-season competition and tournaments for team sports can be both long and congested, with some sports competing up to three times per week. During these periods of time, athletes need to prepare technically, tactically and physically for the next fixture and the short duration between fixtures means that, in some cases, physical preparation ceases, or training focus moves to recovery as opposed to progressing adaptations. Objective The aim of this review was to investigate the effect of training frequency on muscular strength to determine if a potential method to accommodate in-season resistance training, during busy training schedules, could be achieved by utilizing shorter more frequent training sessions across a training week. Methods A literature search was conducted using the SPORTDiscus, Ovid, PubMed and Scopus databases. 2134 studies were identified prior to application of the following inclusion criteria: (1) maximal strength was assessed, (2) a minimum of two different training frequency groups were included, (3) participants were well trained, and finally (4) compound exercises were included within the training programmes. A Cochrane risk of bias assessment was applied to studies that performed randomized controlled trials and consistency of studies was analysed using I2 as a test of heterogeneity. Secondary analysis of studies included Hedges’ g effect sizes (g) and between-study differences were estimated using a random-effects model. Results Inconsistency of effects between pre- and post-intervention was low within-group (I2 = 0%), and moderate between-group (I2 ≤ 73.95%). Risk of bias was also low based upon the Cochrane risk of bias assessment. Significant increases were observed overall for both upper (p ≤ 0.022) and lower (p ≤ 0.008) body strength, pre- to post-intervention, when all frequencies were assessed. A small effect was observed between training frequencies for upper (g ≤ 0.58) and lower body (g ≤ 0.45). Conclusion Over a 6–12-week period, there are no clear differences in maximal strength development between training frequencies, in well-trained populations. Such observations may permit the potential for training to be manipulated around competition schedules and volume to be distributed across shorter, but more frequent training sessions within a micro-cycle rather than being condensed into 1–2 sessions per week, in effect, allowing for a micro-dosing of the strength stimuli.
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Driggers, Austin R., i Kimitake Sato. "The effects of vertically oriented resistance training on golf drive performance in collegiate golfers". International Journal of Sports Science & Coaching 13, nr 4 (24.11.2017): 598–606. http://dx.doi.org/10.1177/1747954117743374.
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The purpose of this study was to examine the effects of vertically oriented resistance training on golf driving performance. Ten Division-I collegiate golfers completed two resistance training sessions per week for 10 weeks during the fall tournament season. Pre- and post-training assessments of strength-power and golf performance were compared. To assess strength-power, jump height, peak force, and peak power were measured from static and countermovement vertical jumps; peak force and rate of force development from 0 to 250 ms were measured from an isometric mid-thigh pull. Golf performance was assessed in terms of ball launch speed, spin rate, carry yardage, and total yardage, averaged from five shots using a driver. Following training, all measures of strength-power improved, with countermovement jump peak power improving significantly ( p < 0.00625). The golf performance assessment indicated significant increases ( p < 0.0125) in ball speed, carry yardage, and total yardage. These results suggest that vertically oriented resistance training can improve golf driving performance.
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Waldrop, Norman, Lyle Cain, Benton Emblom i Michael Ryan. "Functional Return to Play after Surgical Treatment of Lower-Extremity Injuries using Global Positioning System Profiles in Elite College Football Players". Foot & Ankle Orthopaedics 2, nr 3 (1.09.2017): 2473011417S0004. http://dx.doi.org/10.1177/2473011417s000401.
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Category: Sports Introduction/Purpose: Return to sport criteria after surgical treatment of lower extremity injuries are highly variable and without consensus. Thigh measurements assessing atrophy, single-leg hop testing and isokinetic strength measurements are commonly used metrics when considering return to sport after surgical treatment of lower-extremity injuries. Yet, these modalities are limited in scope, as they do not fully or accurately evaluate functional movements required in elite athletics. Alternatively, using new Global Positioning System (GPS) technology, a wide breadth of functional movements can be tracked for each athlete, which can be used as a comparative self-control in the event of an injury. This data proposes a more comprehensive, dynamic and longitudinal comparison of athlete performance, which may more accurately reflect functional return to sport in elite athletes after surgery. Methods: Over a three-year period, GPS data was collected on thirteen elite American College Football players at a single FBS Subdivision University. A total of 300 data points per athlete were collected for every practice, scrimmage and game starting in spring prep and extending through regular season, and post-season play. A total of 5.7 million data points including total distance traveled, average and maximum velocity, acceleration profiles, and explosive change of direction through inertial movement analysis were prospectively collected and analyzed. Individual pre-injury GPS functional profiles for each of the thirteen athletes were used as baseline, healthy comparisons, and functional recovery was determined prospectively during return to play progression after lower extremity surgery. Return to sport was allowed when post-operative GPS profiles demonstrated equivalence or superiority of all parameters compared to pre-injury measurements. Results: All thirteen players returned to sport after all measured parameters were equal to or greater than pre-injury levels. Conclusion: Modern GPS technology employed during preseason, regular season and post-season establishes an individualized, baseline, profile of lower-extremity function which allows for postoperative comparison and prospective assessment of safe return to play in elite football players.
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Opar, David A., Ryan G. Timmins, Fearghal P. Behan, Jack T. Hickey, Nicol van Dyk, Kara Price i Nirav Maniar. "Is Pre-season Eccentric Strength Testing During the Nordic Hamstring Exercise Associated with Future Hamstring Strain Injury? A Systematic Review and Meta-analysis". Sports Medicine 51, nr 9 (29.04.2021): 1935–45. http://dx.doi.org/10.1007/s40279-021-01474-1.
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