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Zeitschriftenartikel zum Thema "Sports movement tests"
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Gierczuk, Dariusz, Zbigniew Bujak, Jan Rowiński und Aleksey Dmitriyev. „Selected Coordination Motor Abilities in Elite Wrestlers and Taekwon-Do Competitors“. Polish Journal of Sport and Tourism 19, Nr. 4 (01.12.2012): 230–34. http://dx.doi.org/10.2478/v10197-012-0022-1.
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Abstract Introduction. The aim of the study was to compare CMAs in elite wrestlers and taekwon-do competitors. Material and methods. Forty-nine Greco-Roman wrestlers and ITF taekwon-do competitors were included in the study. The wrestlers were 21.9±2.74 years old, while the taekwon-do competitors were 22.7±5.78 years old. The former group had between 7 and 14 years' training experience and the latter group had from 6 to 16 years' experience. All subjects were elite sportspeople (between first class and international master class levels). Five CMAs were assessed using 14 indices. Computer tests from the Vienna Test System were employed in the study. Results. It was shown that there were no significant differences in CMA levels between wrestlers and taekwon-do competitors. Wrestlers from higher sports classes outperformed competitors who possessed lower sports classes in the majority of CMA indices. Statistically significant differences were observed for simple reaction, movement coupling and high frequency of movements. Taekwon-do competitors at the international master sports class (IM) level scored better than athletes who were at national master class (NM) and first class (I) levels in spatial orientation, reaction time, movement coupling and high frequency of movements. Regardless of the type of combat sport, competitors demonstrated high individual differences in CMAs, which may indicate that a focus on coordination improvement could increase training effectiveness. Conclusions. Further research on identifying predominant CMAs in sportspeople at different levels of competition, particularly in those achieving significant sports successes may be conducted. Tests to thoroughly diagnose coordination should be employed in such investigations.
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Mocrousov, Elena. „Stabilometrical Studies of Children’s Functional Movement Status for their Selection for Table Tennis in the Modern Context“. Physical Education and Sport Through the Centuries 6, Nr. 1 (01.06.2019): 29–37. http://dx.doi.org/10.2478/spes-2019-0003.
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Summary Modern sport is characterized by rapid growth of records and achievements, and related significant intensification of training and competitive loads requires a scientifically grounded search for talented young people, who can cope with heavy sports loads, high rates of sports development and sports achievements. At the same time, search and selection of talented children for sports to begin their sports development should be based on scientific achievements in the field of pedagogy, psychology, physiology, sports training and other special subjects which give an appropriate idea about specifics of the status and development of the organism, its functional and movement capabilities. Exploring the problems of today’s youth, and the origins of table tennis, we can state that at the present stage table tennis can be an effective means of physical education of the younger generation of the Republic of Moldova, not only for sports development but also for the education of the socially and morally healthy young people. Sports practice of athlete’s development requires knowledge and records of indicators of their present and prospective physical, functional and psychomotor status, which dynamics and forecast allow planning athletic performance. The material for publication provides research findings on stabilometrical studies of functional movement status of children participating in sports selection for table tennis. At the same time, stabilometric criteria of children selection for table tennis serve an effective assessment of their physical condition, based on their previous movement experiences. Applied stabilometrical tests for studying and assessing the functional movement skills are quite adequate to the due age development of the explored children and they allow to perform efficient sports selection at a high level. Applying these tests in the process of sports selection of children for table tennis will allow us to identify often outwardly hidden visual, hearing, proprioceptive, and vestibular distortions and necessary psychomotor status allowing to control their own motor actions.
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Zhu, Shuyun. „REDUCING THE SPORTS INJURY THROUGH FUNCTION MOVEMENT BIOLOGICAL IMAGE DATA SCREENING“. Revista Brasileira de Medicina do Esporte 27, Nr. 3 (September 2021): 286–90. http://dx.doi.org/10.1590/1517-8692202127032021_0108.
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ABSTRACT Introduction Among the many cases of sports injuries, the incidence of musculoskeletal injuries remains high. After a musculoskeletal injury occurs, athletes often need to suspend training and undergo rehabilitation. A suitable sport mode requires athletes to have sufficient joint range of motion, core stability, and balance ability in different positions to complete various complex movements in training and competition. Objective The paper analyzes the impact of warm-up exercises before the test on the test results of functional sports biological image data screening ( FMS TM ) and provides references for unifying test conditions, checking the reliability of FMS TM repeated tests, and discussing the comparability of the research results. Methods The paper used the same password and process to test 12 young male volleyball professional athletes without warm-up and warm-up. The two-dimensional motion analysis system Dartfish Pursuit 8.0 was used to analyze the video data recorded by the two cameras simultaneously. Results In the two tests before and after, the hurdle step score (1.75±0.62 vs. 2.42±0.52) and the total score (13.50±2.20 vs. 16.42±2.15) were significantly higher than those without the warm-up test (P<0.01). Besides, in squats (1.58±0.67 vs. 1.92±0.67), straight lunges (2.00±0.43 vs. 2.50±0.52), active straight leg lifts (1.50±0.67 vs. 2.00±0.60), rotation stability (1.42) ±0.52 vs. 1.92±0.29) showed a significant increase in the score (P<0.05). Conclusions Warm-up exercises before the test can improve the test results. This abnormal movement pattern observed only by visual inspection may not truly reflect the “dysfunction” of the movement. In the case of ignoring the pre-test warm-up factors, feedback on sports performance and formulating training strategies, this conclusion of predicting injury risk and evaluating training effects may have specific limitations in its reference value. Level of evidence II; Therapeutic studies - investigation of treatment results.
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Taha, Zahari, Rabiu Muazu Musa, Mohammad Razali Abdullah, Mohd Azrai Mohd Razman, Chei Ming Lee, Faeiz Azizi Adnan, Muhammad Amirul Abdullah und Mainul Haque. „The Application of Inertial Measurement Units and Wearable Sensors to Measure Selected Physiological Indicators in Archery“. Asian Journal of Pharmaceutical Research and Health Care 9, Nr. 2 (10.04.2017): 85. http://dx.doi.org/10.18311/ajprhc/2017/11046.
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The requirement for objective techniques to observe physical action in its distinctive measurements has prompted the improvement and broad utilisation of motion sensors called Inertial Measurement Units (IMUs), which measures bodily movements. However, although these sensors have been utilised to measure postural balance in both clinical and some specific sports, little or no effort have been made to apply these sensors to the measurement of other physiological indicators in the sport of archery. This study aims to ascertain the postural balance, hand movement, muscular activation as well as heart rate of an archer. An archer was instructed to perform two balance standings, two hand movements and his muscular activations of flexor and extensor digitorum, as well as heart rate, were recorded using Shimmer sensors. The mean movement of x and y-axis of the archer was used to correlate with the Pearson correlation for testing the validity of the sensors. Kolmogorov/Smirnov test was utilised to measure the reliability of the sensors over test re-test in two different tests. The coefficient of determination indicates some positive and negative significant relationships between some indicators. The Kolmogorov/Smirnov test re-test reveals a significant difference between all the indicators in both tests A and B, p < 0.001. The archer was able to present two types of postural standings and exhibited two hands movement while holding the bow. However, his heart rate demonstrated some variability during the executions of the movement in both tests. Thus, it could be concluded that the fusion sensors are reliable in measuring the aforementioned physiological indicators.
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Cejudo, Antonio, Pilar Sainz de Baranda, Francisco Ayala, Mark De Ste Croix und Fernando Santonja-Medina. „Assessment of the Range of Movement of the Lower Limb in Sport: Advantages of the ROM-SPORT I Battery“. International Journal of Environmental Research and Public Health 17, Nr. 20 (19.10.2020): 7606. http://dx.doi.org/10.3390/ijerph17207606.
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Range of movement (ROM) assessment is an important strategy to increase physical-technical performance and minimize the risk of sports-related injuries. Currently, there is no consensus regarding which ROM assessment method is the most appropriate. The main objective of this study was to perform a systematic review of the test batteries available for the assessment of lower limb ROM; additionally, we compare the ROM-SPORT I battery with those previously reported in the literature. The systematic review was conducted following the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines. The identification of publications was made by using the databases SciELO, Medline, Scopus, PubMed, and Web of Science. Based on the inclusion criteria, sixteen publications were selected and analyzed. The ROM-SPORT I battery is the most valid of the analyzed methods. This battery evaluates the ROM of eleven lower limb movements. The inclinometer with a telescopic arm and a box is a simpler, more comfortable, and faster procedure than others. The Lumbosant support and use of two examiners are essential to avoid compensatory movements to obtain reliable measurements during ROM assessment. The ROM-SPORT I is a field-based battery of tests that may be used by sports professionals, clinics, and researchers in applied settings to accurately assess and monitor lower extremity ROM.
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Steinberg, Nili, Roger Adams, Moshe Ayalon, Nadav Dotan, Shiri Bretter und Gordon Waddington. „Recent Ankle Injury, Sport Participation Level, and Tests of Proprioception“. Journal of Sport Rehabilitation 28, Nr. 8 (01.11.2019): 824–30. http://dx.doi.org/10.1123/jsr.2018-0164.
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Objective: Assessing the effects of ankle injury and sport participation level on ankle proprioceptive sensitivity using a joint position reproduction (JPR) test and an inversion movement extent discrimination test. Design: Cross-sectional. Setting: Biomechanics lab. Participants: Forty-five student athletes ages 21–30 (mean = 24.8 y). Main Outcome Measures: Participants were tested for ankle inversion sensitivity using 2 devices; movement reproduction error was obtained from JPR in a non-weight-bearing (N-WB) state at 10° and 15° of inversion, and an ankle proprioceptive sensitivity score was obtained from the active movement extent discrimination apparatus (AMEDA), representing the ability to differentiate 5 inversion movement extents between 10.5° and 14.5°, with testing in both N-WB and weight-bearing (WB) states. Results: For the 34 athletes with no ankle injury in the previous 12 months, the sensitivity scores achieved on the AMEDA were significantly higher (P < .01) than those for the 11 athletes with ankle injury, and the injury effect was significantly greater in WB (P = .01). In JPR testing, the 2.96° error of reproduction for athletes with no recent ankle injury was not significantly different from the 3.36° error for those with ankle injury (P = .46). Correlation of current sport participation level with JPR showed less error for higher-level performers (r = .49, P = .001) but no significant relationship to WB or N-WB AMEDA scores (both P > .61). WB AMEDA scores were significantly higher for athletes who had competed at a higher level of sport competition when <18 years old (r = −.57, P < .001). Conclusions: Previous ankle sprains affected proprioceptive scores on the WB AMEDA and N-WB AMEDA tests, indicating the sensitivity of the AMEDA movement discrimination test to the effects of ankle injury. The correlation between JPR scores and current level of sport participation suggests the sensitivity of the JPR test to current ankle use.
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Starosta, Włodzimierz. „Importance of movement symmetry in technical and tactical preparation of high advanced judokas different level of mastership“. Journal of Combat Sports and Martial Arts 8, Nr. 1 (30.06.2017): 25–29. http://dx.doi.org/10.5604/01.3001.0010.4653.
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Introduction. The equalizing level of judokas preparation and more tough international competition force to seek continuously for reserves. The dimishing reserves still remaining in fitness draw attention to technical and tactical preparation. Here, movement symmetry and its application in tactics have been little used, as yet. The objective was to determine appearance of movement symmetry its extent and importance for sport successes by judokas. Methods and material. general physical fitness tests, interviews, observations. Tested were 136 advanced judokas (male and female), mainly juniors (finalists of the Polish Youth Games, reserve of the Polish Junior National Team). Results were given on the background of literature data for 959 judokas from various countries. Results. Investigation of the large judokas group has shown domination of right-side body activity, especially in young judokas (threefold in juniors). Over 20% of leading judokas made throws in both directions, with their number increasing with increase in sport proficiency (up to 57.3% among medal winners, and 71.4% among golden medal winners during various events, including Olympic Games). Symmetrically trained judokas have had greater successes when using right and left throws. This points to the increasing important of movement versatility at the highest level of sports mastery. Conclusion. Physical fitness test results in judokas show a differentiation in the body sides abilities in particular tests. This differentiation has been the highest in balance, flexibility and global movement coordination tests and lowest in the force (speed type tests).
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Kaplan, Yonatan, und Erik Witvrouw. „When Is It Safe to Return to Sport After ACL Reconstruction? Reviewing the Criteria“. Sports Health: A Multidisciplinary Approach 11, Nr. 4 (28.05.2019): 301–5. http://dx.doi.org/10.1177/1941738119846502.
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Context: There is an ever-increasing trend toward sports, fitness, and recreation activities, so the incidence of anterior cruciate ligament sports injuries has increased. Perhaps the greatest challenge for sports clinicians is to return the injured athlete back to his/her original sport at an even greater level of functional ability than preinjury. For this, rigorous and well-researched criteria are needed. Evidence Acquisition: Using medical subject headings and free-text words, an electronic search was conducted up to October 2018. Subject-specific search was based on the terms return to play and return to sport in combination with guidelines, criteria, and anterior cruciate ligament reconstruction. Study Design: Descriptive review. Level of Evidence: Level 2. Results: Five principal criteria were found, including psychological factors, performance/functional tests, strength tests, time, and modifiable and nonmodifiable risk factors. Conclusion: The psychological readiness of the player is a major factor in successful safe return to sport (SRTS) decision making. Although strength, performance, and functional tests presently form the mainstay of SRTS criteria, there exists very little scientific evidence for their validity. More protection should be provided to athletes with known risk factors. Movement quality is important, if not more important than the quantifiable measures. As a result of the significantly high rerupture rate in young individuals, delayed SRTS should be considered preferably beyond 9 months postsurgery.
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Granström, Hannah, Björn O. Äng und Eva Rasmussen-Barr. „Movement control tests for the lumbopelvic complex. Are these tests reliable and valid?“ Physiotherapy Theory and Practice 33, Nr. 5 (04.05.2017): 386–97. http://dx.doi.org/10.1080/09593985.2017.1318422.
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Marques, Joao Beleboni, Darren James Paul, Phil Graham-Smith und Paul James Read. „Change of Direction Assessment Following Anterior Cruciate Ligament Reconstruction: A Review of Current Practice and Considerations to Enhance Practical Application“. Sports Medicine 50, Nr. 1 (17.09.2019): 55–72. http://dx.doi.org/10.1007/s40279-019-01189-4.
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Abstract Change of direction (CoD) has been indicated as a key mechanism in the occurrence of anterior cruciate ligament (ACL) injury during invasion sports. Despite these associations, assessments of knee function in athletic populations at the time of return to sport following ACL reconstruction (ACLr) have often focused on strength and single-leg hop tests, with a paucity of evidence to describe the CoD characteristics. Therefore, the aim of this narrative review was to describe the movement strategies exhibited following ACLr during CoD tasks and to critically analyze the range of tests that have been used. Specifically, we examined their ability to identify between-limb deficits and individuals who display a heightened risk of secondary injury and/or reductions in their level of pre-injury performance. MEDLINE, PubMed and SPORT Discuss databases were used and 13 articles were identified that met the inclusion criteria. Examination of the available literature indicates that current field-based practices are not representative of relevant sport demands and are unable to effectively assess knee function following ACLr. Laboratory-based studies have identified residual deficits and altered movement strategies at the time of return to sport, and this in part may be related to risk of re-injury. However, these assessments exhibit inherent limitations and are not practically viable for monitoring progress during rehabilitation. Consequently, alternative solutions that are more-aligned with the multitude of factors occurring during CoD maneuvers in chaotic sports environments are warranted to allow practitioners to ‘bridge the gap’ between the laboratory and the sports field/court. This approach may facilitate a more informed decision-making process with the end goal being, a heightened ‘return to performance’ and a lower risk of re-injury.
Dissertationen zum Thema "Sports movement tests"
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Sivley, James C. „The Effects of Repeated Anaerobic Bouts on Immune Parameters“. TopSCHOLAR®, 2009. http://digitalcommons.wku.edu/theses/101.
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To date, the exercise-induced immune response in has only been evaluated in subjects performing aerobic exercise. The primary purpose of this study is to determine if repeated bouts of anaerobic exercise will induce a similar immune response in human subjects as exhibited by aerobic exercise. Secondary to immune function, an analysis of performance from trial to trial will be made. Nine males between the ages of 18-25 were selected on a volunteer basis to participate in this study. Subjects performed Wingate tests set in 3 series with 120 seconds between trials within series and 405 seconds between series for an exercise duration of 30 minutes. Blood samples were taken again immediately post test, and 1 hour post test and analyzed for cytokine secretion, epinephrine, and Caspase-3. The present study found that repeated bouts of anaerobic exercise did not alter immune function.
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Tavares, António Jorge Oliveira. „Relação entre os resultados obtidos em testes específicos para a avaliação da força muscular e a prestação numa corrida de cem metros planos em atletismo“. Master's thesis, Instituições portuguesas -- UP-Universidade do Porto -- -Faculdade de Ciências do Desporto e de Educação Física, 2000. http://dited.bn.pt:80/29224.
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Liu, Junshi. „Comparisons Between Movement Onset Identification Methods Used in Isometric Mid-Thigh Pull Test“. Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etd/3490.
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This dissertation aimed to explore the usefulness of using force derivatives for onset detection in the isometric mid-thigh pull test. First, we examined applications of three differential calculus principles, first and second derivative, and curvature using visual detection as a reference under different baseline conditions. Second, we compared the best derivative method to a threshold-based method using visual detection as a reference. Results of our first investigation showed trivial differences between many differential calculus methods and visual detection. However, statistical differences exceeding a trivial effect was observed when instantaneous force and rate of force develop were examined. Through the first investigation, first and second derivative emerged as possible viable methods for baseline with a countermovement and for all other baseline conditions, respectively. Results of the second investigation showed similarities to the first investigation with respect to onset time. However, examination of instantaneous force and rate of force development indicated that a threshold-based method tended to overestimate compared to visual detection and a first and second derivative combined method. In fact, the difference between visual detection and the first and second derivative combined method ranged from trivial to moderate under all baseline conditions while the threshold-based method often reached a large difference. Overestimation by the threshold-method was more pronounced for rate of force development. In conclusion, while not perfect, the first and second derivative 3 combined method appears to hold possible practical potential and may be used as an assistant method for entry-level sport scientist plus using visual detection for obvious erroneous values.
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Peiffer, Adam J. „The Collaborative Assessment of Neurocognition and Vision in Adolescents with Sports-related Concussion - The CANVAS Concussion Study“. The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523962375501181.
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Pulejo, Concetta. „Declinio dell'efficienza fisica psicomotoria negli anziani-uno studio comparativo basato sulla batteria di test ALFFE (Activity Level Functional Fitness in the Elderly) condotto su tre different popolazioni del Portogallo, Italia e Belgio“. Phd thesis, Instituições portuguesas -- UP-Universidade do Porto -- -Faculdade de Ciências do Desporto e de Educação Física, 1999. http://dited.bn.pt:80/29103.
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Karlsson, Tobias, und Simon Gustafsson. „Kampen mellan defensiva och offensiva fotbollsspelare : En kvantitativ studie som undersöker samband mellan spänst och acceleration/snabbhet hos defensiva och offensiva fotbollsspelare“. Thesis, Linnéuniversitetet, Institutionen för idrottsvetenskap (ID), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-65917.
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Bakgrund: Fotboll är väldens största sport med cirka 240 miljoner utövare i över 200 länder. För en fotbollsspelare är spänst ocksåav största vikt för att kunna hävda sig påplanen. Enligt tidigare studier finns det ett samband mellan att ha individerna med en god spänst även var snabba och hade en bra acceleration. Studier gjorda på elitspelare visar att försvarare och anfallare har bättre spänst än mittfältare. Denna studie har tidigare kartlagt syreupptagningsförmågan (Vo2 max) hos ett herrlag i division 5 lag och vill därför undersöka sambandet mellan spänst och acceleration/snabbhet hos samma studiepopulation. Det är av intresse att undersöka förhållandet mellan spänst och acceleration/snabbhet samt att undersöka skillnader mellan positioner på ett herrlag som spelar i division 5 i Sverige eftersom mycket av den tidigare forskningen visar resultat från professionella eller ungdomar. Syfte: Syftet med studien är att undersöka om det finns samband mellan spänst och snabbhet/acceleration samt om det skiljer sig mellan defensiva och offensiva positioner?Metod: Med hjälp av ett Counter Movement Jump (CMJ) test och 30 meter sprint test undersökte sambandet mellan spänst och acceleration/snabbhet på20 manliga fotbollsspelare i division 5.Resultat: Resultatet av studien visar på en signifikant korrelation mellan spänst och snabbhet, att offensiva besitter en bättre spänst/snabbhet.Diskussion: Resultaten är i linje med tidigare forskning som visar samband mellan spänst och acceleration/snabbhet. Dock visar resultatet från denna studie ingen signifikant skillnad mellan spänst och acceleration vilket kan bero på att studien använde sig av tidtagarur istället för fotoceller som är ett mer tillförlitligt instrument. Studien fann signifikanta skillnader i spänst och snabbhet mellan de defensiva och offensiva positionerna där de offensiva hade bäst resultat. För framtida forskning vore det intressant med en större kartläggning över alla divisioner för att kunna finna generaliserbara resultat och även göra tester på liknande idrotter.
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Souza, Bruno Jeuken. „Salathiel Campos: esporte e política (1926-1938)“. Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/8/8138/tde-23072018-163448/.
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Esta pesquisa teve por objetivo estudar a relação entre a militância do movimento negro e a inclusão de jogadores negros no futebol de São Paulo, entre 1926 e 1938, por meio do trabalho de Salathiel de Campos. Jornalista negro e militante, sua carreira começou no início dos anos 20 e terminou, de forma trágica, em meados dos anos 40. Apesar disso, deixou uma obra da mais completa relevância para os estudos da História Social, no geral, e do Movimento Negro nos esportes, em particular. Na segunda metade dos anos 20, sua militância mais efetiva começou com a participação em uma campanha nA Gazeta em defesa dos jogadores negros da época. No início dos anos 30, foi membro fundador da Frente Negra Brasileira e atuou de forma importante ao longo de boa parte dessa década. Mais tarde, com a ação repressiva do Estado Novo, os movimentos sociais e partidos políticos são abruptamente encerrados pelo governo varguista, e o ciclo de conquistas do movimento negro é interrompido por longos anos. Ao fim desse período ditatorial, também chega ao fim a carreira deste importante jornalista militante.This research aims to study the relationship between the activism of the black movement and the inclusion of black players in the state of São Paulos football between 1926 and 1938 through the work of Salathiel de Campos. A black journalist and social activist, his career began in the early twenties but tragically ended during the 1940s. Nonetheless, he left a social historical work of notable relevance that contributes not only to the history of football but also to the black movements history itself. Salathiel was an active member of the black press who had a profound impact in the creation of the Brazilan Black Front after a successful and effective activism calling for the defense of black footballers of the time. This activism ended abruptly during Getúlio Vargas dictatorship in mid-1930s when the Brazilian Black Front alongside other movements such as the Black Social Culture Club were deemed illegal. The early victories verified in 1926 were transformed into a melancholic defeat for the black movement struggles of the time.
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Ryan, Helen Joanne. „The development of a reliable and valid netball intermittent activity test : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Sport and Exercise Science at Massey University, Auckland, New Zealand“. Massey University, 2009. http://hdl.handle.net/10179/1130.
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The purpose of the present investigation was to identify the exercise intensity of netball match play in order to assist in the development of a Netball Intermittent Activity Test (NIAT). A further aim was to assess the criterion validity and the test-retest reliability of the NIAT. Eleven female netball players (21.4 ± 3.1 years, 1.73 ± 0.06 m, 69.3 ± 5.3 kg and 48.4 ± 4.9 ml•kg-1•min–1 mean ± SD, age, height, body mass and VO2max, respectively) volunteered to participate in the study. Heart rate data was recorded for all participants from at least two full 60 minute games during Premier Club competition. Individual maximum heart rate values were acquired for all subjects from the performance of the Multistage Fitness Test, and used to transform heart rate recordings into percent maximum heart rate (%HRmax). Patterns in %HRmax were used to indicate positional grouping when developing the NIAT from time motion analysis data. Subjects performed two trials of the NIAT separated by at least seven days. Physiological and performance markers were measured systematically throughout the NIAT. Exercise intensity as denoted by %HRmax significantly decreased from the first half of match play to the second half (90.4 ± 2.7% v 88.3 ± 2.8%; p<0.05). Significant differences (p<0.05) were observed between positional groups and led to the grouping of Defence (D), Centre Court (CC), and Attack (A) players for NIAT performance. Comparisons of %HRmax between match play and NIAT performance indicated that the NIAT had good criterion validity for D (match Mdn = 92.52% vs. NIAT Mdn = 86.27%, p>0.05) and A (match Mdn = 86.95% vs. NIAT Mdn = 82.93%, p>0.05) players, but that %HRmax during the NIAT (Mdn = 79.70%) was significantly lower than match play (Mdn = 89.70%) for CC group (p<0.05). Measures of 5 m sprint performance (1.27 ± 0.06 s v 1.25 ± 0.06 s; p>0.05; r=0.66, p<0.001), vertical jump height (29.12 ± 4.17 cm v 28.82 ± 3.60 cm; p>0.05; r=0.91, p<0.001), circuit time (107.49 ± 3.22 s v 107.89 ± 4.27 s; p>0.05; r=0.72, p>0.001) and %HRmax (82.56 ± 4.66% v 81.03 ± 4.13%; p>0.05; r=0.82, p<0.001) for NIAT1 vs. NIAT2 indicated good test-retest reliability. These data suggest that netball players experience a reduction in exercise intensity over the duration of a game, with exercise intensity being related to on-court position. Whilst the NIAT appears to be a repeatable activity pattern, it is not a good simulation of physiological strain for all positional groups. More work is required in order to create a netball simulation that is both reliable and valid for all players.
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Hägglund, Eva, und Filip Nyman. „Muskulär profilering av underkroppen hos manliga amatörklättrare. : En undersökning av styrka och power i nedre extremiteter hos klättrare på avancerad och moderat nivå“. Thesis, Umeå universitet, Idrottsmedicin, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149465.
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Klättring som utförs på överhängande ytor blir allt vanligare och kräver mer avancerad användning av underkroppen. Då tidigare forskning i synnerhet undersökt överkroppsstyrka saknas en muskulär profilering av underkroppen hos klättrare vilket således var syftet med denna studie. Frågeställningarna eftersträvade att undersöka om skillnader i styrka och power i nedre extremiteter kan relateras till prestation hos manliga klättrare. Deltagarna var 10 manliga amatörklättrare som delades in i 2 grupper baserat på idrottsspecifik prestationsnivå. Grupp 1 (n=6) kategoriserades som avancerade klättrare och grupp 2 (n=4) som moderata. Ett isokinetiskt styrketest och två olika hopptester genomfördes av samtliga studiedeltagare. Efter statistisk analys framgick det att det inte fanns några signifikanta skillnader (p= 0,05) mellan grupperna gällande relativ styrka i quadriceps, relativ styrka i hamstrings, H/Q-kvot, hopphöjd vid SJ eller hopphöjd vid CMJ. Gruppen med mer avancerade klättrare presterade signifikant högre vid CMJ kontra SJ (p=0,013). Slutsatserna av denna studie är att klättrare har förhållandevis låga resultat både vid mätning av H/Q-kvot vid 90°/s (grupp 1: 51% vs. grupp 2: 53,9%), 210°/s (59,4% vs. 57,9%) och vid vertikala hopptester (SJ: 32,1cm vs. 31,7cm; CMJ: 35,8 cm vs. 33,9 cm) samt att hoppteknik verkar kunna vara en bidragande faktor för prestation inom klättring.Rock climbing performed on overhanging surfaces is becoming more common and requires more advanced use of the lower body. Since previous research has mostly examined upper body strength there is a need for a muscular profiling of the lower body of climbers, which was the purpose of this study. The study sought to investigate whether differences in strength and power in the lower extremities can be related to climbing performance in male climbers. The participants were 10 male amateur climbers divided into two groups based on athletes-specific performance level. Group 1 (n=6) where categorized as advanced climbers and group 2 (n=4) as moderate. An isokinetic strength test and two different jump tests were performed by all study participants. After statistical analysis, there were no significant differences (p= 0,05) between the groups in relative strength in the quadriceps, relative strength in hamstrings, H/Q-ratio, jump height at SJ or jump height at CMJ. The group with more advanced climbers performed significantly higher at CMJ versus SJ (p = 0.013). The conclusions of this study are that climbers have relatively low results when measuring H/Q-ratio at 90°/s (group 1: 51% vs. group 2: 53,9%), 210°/s (59,4% vs. 57,9%) and height at vertical jump tests (SJ: 32,1cm vs. 31,7cm; CMJ: 35,8 cm vs. 33,9 cm) and that jump technique seems to be a contributing factor in climbing performance.
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Åberg, John. „Bryta målchansen tidigt : Fysiska tester skapade för målvakter“. Thesis, Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-5864.
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Syfte och frågeställningar Studiens syfte är att undersöka relationen mellan ungdomsmålvakters resultat i vanligt förekommande standardtester som är avsedda att mäta fysisk kapacitet och deras prestation i matchlika aktioner. Syftet är också att undersöka om resultaten skiljer sig mellan målvakter i två olika ålderskategorier. Frågeställningar: Vad är korrelation mellan resultat i standardtester och matchlika aktioner? Skiljer sig resultaten mellan ungdomsmålvakter på U17 och U19 nivå? Metod För att svara på studiens frågeställningar skapades ett testbatteri innehållande fysiska tester designade för fotbollsmålvakter, utifrån deras rörelsemönster och aktioner (verklighetsnära tester), som jämförs med tester som används av dagens fotbollsklubbar (standardtester). Med hjälp av aktuellt forskningsläge tillsammans med information som mottagits från tränare och målvakter, utfördes 6 tester, på 15 målvakter, som registrerades med mätinstrument och höghastighetskameror. Resultatet analyserades med dubbelsidig t-test för att finna en statistisk signifikans mellan två åldersgrupper och Spearmans test för att finna en korrelation mellan standard- och verklighetsnära testerna. Resultat Resultatet från t-testet visade ingen signifikant skillnad mellan U17:s och U19:s målvakter på samtliga tester (p> 0,05). Spearmans test visade ingen statistiskt signifikant korrelation mellan testerna. Slutsats Både standard- och verklighetsnära testerna har sina fördelar men är syftet att utvärdera målvaktens fysiska kapacitet i matchlika situationer genom tester, bör dessa vara utformade utifrån målvaktens agerande under match. Enligt resultaten från denna studie visar detta att man inte enbart kan använda standardtester utan dessa bör kompletteras med tester specifikt utformade för måvakter.Aim The aim of the study is to investigate the relationship between youth goalkeepers' results in commonly used standard tests that are intended to measure physical capacity and their performance in match-like actions. The purpose is also to investigate whether the results differ between goalkeepers in two different age categories. Research questions: What is the correlation between results in standard tests and match-like actions? Do the results differ between youth goalkeepers at U17 and U19 level? Method To answer the study's questions, a test battery was created containing physical tests designed for football goalkeepers based on their movement patterns and actions (match-like actions) compared to tests used by today's football clubs (standard tests). With the help of research, together with information we received from coaches and goalkeepers, 6 tests were designed and performed, on 15 goalkeepers, which were recorded with measuring instruments and high-speed cameras. The results were analyzed with two tailed t-test to find a statistical significance between the two age groups and Spearman's test to find a correlation between the standard and realistic tests. Results The results of the t-test show no significant difference between the U17 and U19 goalkeepers on all tests (p> 0.05). Spearman's test shows that there was no statistic significant correlation between the tests. Conclusions Both standard and realistic tests have their advantages, but if the purpose is to evaluate the goalkeeper's physical capacity in match-like actions through tests, should these be designed based on the goalkeeper's actions during the match. According to the results of this study, this shows that you should not just use standard tests, but these should be supplemented with tests specifically designed for goalkeepers.
Bücher zum Thema "Sports movement tests"
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1941-, Norman Robert W., Hrsg. Standardizing biomechanical testing in sport. Champaign, IL: Human Kinetics Publishers, 1987.
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Liu, Yunwu, und Fenghao Sun. „Analysis of Computer Technology on Sports Technical Movement Characteristics of Model Test Research“. In Advances in Intelligent Systems and Computing, 103–10. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69999-4_14.
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Selikowitz, Mark. „Coordination and clumsiness“. In Dyslexia and Other Learning Difficulties. Oxford University Press, 1993. http://dx.doi.org/10.1093/oso/9780192622990.003.0017.
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Rachel is eight years old. She was slow to crawl and walk. She still cannot pedal a tricycle, fasten small buttons, or tie her laces. She is very poor at sports and is often teased by the other children for her awkward running style. She is a messy eater and washes herself and brushes her teeth with great difficulty. Her mother says that she has a poor sense of direction and still confuses right with left. Rachel’s school work is satisfactory. Her writing is untidy, but if she prints slowly it is legible. Rachel has been tested by a psychologist and found to have some visual perception difficulties, but to be of normal intelligence. Her reading, spelling, and arithmetic are in the average range. A paediatrician has examined Rachel and detected no abnormalities that can account for her clumsiness. The term ‘clumsiness’ will be used in this chapter to refer to unexplained, significant difficulties in the coordination of movement in a child of average, or above average, intelligence. This sort of clumsiness is commonly associated with other forms of specific learning difficulty, such as reading difficulty. This does not mean, however, that most children with specific learning difficulty are clumsy. Many are, in fact, well coordinated. But clumsiness is far more common in children with specific learning difficulty than in other children. Clumsiness is more common in boys and quite often runs in families. The word ‘motor’ is used for movement. Gross motor skills involve large groups of muscles responsible for activities such as walking, running, jumping, hopping, and bicycle riding. Fine motor skills involve the hands and fingers, and are concerned with activities such as writing, drawing, using scissors, and tying knots. There are a number of standardized tests of both gross and fine motor proficiency. These may be performed by a physiotherapist, an occupational therapist, or a doctor. Activities must be carefully observed to detect the presence of tremors and other unusual movements. Balance, strength, tone, reflexes, and ability to interpret certain sensations are all assessed. It is essential that rare, serious conditions associated with poor coordination are excluded by a doctor.
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Close, Troy. „Visual Field Testing“. In Glaucoma. Oxford University Press, 2012. http://dx.doi.org/10.1093/oso/9780199757084.003.0008.
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• Glaucoma results in progressive visual field deterioration, and detecting changes or recording stability in the visual field is important in the management of glaucoma. • Visual field testing is a highly subjective and operator-dependent test. • In patients with glaucoma, the visual field is tested in monocular fashion. •The boundaries of the visual field (in a well-lit environment with an easily visible target) are grossly 60 degrees superiorly, 75 degrees inferiorly, 100 degrees temporally, and 60 degrees nasally. • Basic concept in determination of visual field is “threshold” •Definition of “threshold”: weakest test stimulus that is just visible in a particular location (stimulus intensity at which the patient responds 50% of the time) •Types of visual field testing strategies •Confrontation •Spot testing •Kinetic spot testing •Static spot testing •An initial screening tool to look for large and dense visual field defects that may be present in very advanced glaucoma •Both hands should be used in the testing processed. The patient should occlude the untested eye with the palm of the hand. •If the visual acuity will allow the finger counting technique, all four quadrants may be tested at 3 to 4 feet from the patient at an approximate 45-degree angle holding up either one or two fingers, or a whole hand. • If the visual acuity is HM or LP, then test for light perception in the respective 4 quadrants. • It is important that the patient be able to tell you where the light is located in the field of vision, not simply the presence of light. • Factors that affect the visibility of the spot • Size Intensity • Background illumination Others: color, movement, duration of presentation, attentiveness of the patient, and refractive state of the eye • Kinetic • Usually Goldmann perimetry (though some of the automated machines such as the Octopus will perform kinetic perimetry) • The perimetrist may adjust the location, size, and intensity of the stimulus throughout the test. •Useful in the following cases: Those who need coaching and an altered pace of testing (e.g., elderly, wheelchair-bound, or limited concentration)
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Öhrström, Lars. „To Take Back the Future“. In The Last Alchemist in Paris. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199661091.003.0025.
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There are different ways to be propelled into stardom. In 1953 Audrey Hepburn used a scooter in the William Wyler film Roman Holiday. The unsteady ride ends at a police station, and with Hepburn earning an Academy Award for best actress. A rather different approach was taken by Michael Douglas and friends in Romancing the Stone (Robert Zemeckis 1984, also produced by Douglas), where Douglas and Kathleen Turner are chased throughout most of the film by Danny DeVito in a white Renault 4L. These more modest modes of transport were not quite the style of Michael J. Fox in Zemeckis’ next movie Back to the Future — Fox’s vehicle to international fame is a plutonium-powered DeLorean sports car. While Piaggio (the makers of the Vespa used by Hepburn) and Renault are large companies that still exist, the DeLorean Motor Company was already bankrupt in 1982, too early to profit from the success of the movie—a worldwide blockbuster sensation in 1985. But even if you could find a used DeLorean DMC-12, the only model ever built by the company, don’t expect it to take you back to the 1950s even if you fuel it up with plutonium. In the movie, Fox’s character Marty McFly gets caught up in a time paradox and literally needs to save his own future. In real life, six years later, at the age of 29, Fox was diagnosed with Parkinson’s disease, beginning a very real life fight to take back his own future by battling the disease at all levels. Parkinson’s disease is what is known as degenerative neurological disorder. It is chronic, and there is at present no cure, but treatment to combat the symptoms exists. It was first described in detail by English physician James Parkinson, and named after him by the influential Jean-Martin Charcot whom we met briefly in Chapter 12. The classical symptoms are tremors, rigidity, slowness of movements, and balance problems. The problems for doctors, and consequently for their patients, is that there is no simple chemical or biochemical test for Parkinson’s disease, sometimes making the diagnosis a complicated affair.
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Lauter, Paul. „Society and the Profession, 1958–83“. In Canons and Contexts. Oxford University Press, 1991. http://dx.doi.org/10.1093/oso/9780195055931.003.0006.
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When I was asked to write about the impact of society on our profession over the last twenty-five years, it occurred to me that the period also measures my own lifetime as a professional. I took up full-time teaching in 1957, the year before I received my doctorate. I gave my first paper at a Modern Language Association convention around that time, participated in producing two sons, and published my first article. I left one job, joined in antinuke, anti-ROTC, and prounion activities, and got fired from the second job. I remember complaining to my graduate school director, en route to a third job, how painfully remote upstate New York seemed from everything I valued. Said he, flatly, “You can publish your way out of any place.” Perhaps that was so, then; certainly I acted on that instruction. But I never really put it to the test, for somehow my career swerved that splinter and never returned quite to the groove. In 1963 I went to work for the Quakers, promoting peace studies and learning about political economy. Then, in 1964, I traveled to Mississippi to teach in Freedom Schools and discovered the profound limitations of my graduate school education. With deliberation, among a group of my students from Smith, I went off to jail in Montgomery. Later, as the peace movement brought the war home, I was provided with a more impromptu visit to the Baltimore pokey after trying to protect a Vietnam vet from an outraged policeman. For a number of years I sported a little red button that said “A free university in a free society”—an idea on the basis of which I tried to conduct my life. In due course, I became an active feminist, involved in efforts, like The Feminist Press, to change education and thus society. That pattern of life was not, of course, precisely typical of members of our profession— though more people than we now acknowledge participated in it one way or another. I speak of my life because it reflected, in a sense became a vehicle of, the forces for social change I am to write about here.
Konferenzberichte zum Thema "Sports movement tests"
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Siraiy, B., U. J. Stanic, A. Poplas-Susic und Z. Katkic. „Impact assessment of the morning gymnastics “1000 movements” via ECG and sport test“. In 2018 41st International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO). IEEE, 2018. http://dx.doi.org/10.23919/mipro.2018.8400049.
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Mačura, Peter, Anna Blahutová, Andrej Hubinák, Ján Koštial, Peter Krška, Nadežda Novotná, Jaromír Sedláček und Mária Hulinková. „Basic motor competencies in the 1st and 2nd grade elementary school children in Slovakia“. In 12th International Conference on Kinanthropology. Brno: Masaryk University Press, 2020. http://dx.doi.org/10.5817/cz.muni.p210-9631-2020-9.
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Anumber of youth movement activities, e.g. running, walking, jumping, climbing trees, throw-ing and catching a ball, has been on a decline in the current European cultural space. The results of this research contribute to broadening the knowledge about the level of basic motor competencies and qualifications of the 1st and 2nd grade elementary children in the Slovak Republic. The primary data on the basic motor competencies and qualifications of the examined group (n=307, age = 7.58 ± 0.69 years) were collected by means of the MOBAK 1‒2 test battery (Herrmann et al., 2018b). The significance of differences between boys (n=156, age 7.62 ± 0.69) and girls (n=151, age 7.55 ± 0.70) was evaluated by Student’s t-test in two independent groups. The boys in the first grade (n = 97) achieved a significantly better performance in basic motor competency object movements (x = 5.17 ± 1.79 points) than their female peers (n=88, x = 3.52 ± 1.78). The girls in the second grade did not achieve a statistically better performance in the movement qualifications in throwing, balancing and rolling than the first-graders of the same gender. Knowledge of the level of basic motor com-petencies and qualifications of the Slovak elementary school children allows the national and European educational and cultural authorities to design and improve the content of physical and sport education classes.
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Funazaki, K., K. Yamada und Y. Kato. „Studies on Effects of Periodic Wake Passing Upon a Blade Leading Edge Separation Bubble: Experimental Investigation Using a Simple Leading Edge Model“. In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38281.
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This paper describes experimental investigation on aerodynamic interaction between incoming periodic wakes and leading edge separation bubble on a compressor or turbine blade, using a scaled leading edge model. The studies aims at expanding the range of the test conditions from that of the previous study (Funazaki and Kato [15]) in order to deepen the knowledge on how and to what extent upstream wake passing suppresses the leading edge separation bubble. Special attention is paid to the transitional behaviors of the separated boundary layers, in particular, to the emergence of wake-induced turbulence spots. Hot-wire probe measurements are then executed under five different flow conditions. The test model has a simple structure consisting of a semi-circular leading edge and two flat-plates. Cylindrical bars of the wake generator generate the periodic wakes in front of the test model. Effects of Reynolds number, Strouhal number, direction of the bar movement and incidence of the test model against the incoming flow are examined in this paper. The measurements reveal that the wake moving over the separation bubble does not directly suppress the separation bubble. Instead, wake-induced turbulence spots and the subsequent calmed regions have dominant impacts on the separation bubble suppression for the all test cases. Distinct difference of the bubble suppressing effect by the wakes is also observed when the direction of the bar movement is altered.
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Gnagne, Raoul, Fred Barez, James Kao und Amer El-Hage. „Load Distribution in Barefoot Running Shoes“. In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53018.
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Running is one of the most practiced sports around the world and it dates back to Ancient Greece. Running became an Olympic sport in 1896 and today is mostly performed for fun and to stay in shape. Nowadays, athletic shoe companies make claims on the performance of the type of shoes they manufacture. Some of their claims include shoes that allow free movements, fit like a glove, and are in complete harmony with human mechanics. The preceding characteristics are those of so-called barefoot running shoes. Robillard [1] explains that minimalist running shoes could be defined as those that provide limited or no support and only minimal protection, with the heel at the same level as the forefoot. Even though running may have been investigated, however, there is not enough analyses on barefoot running shoes. The objective of this study was to investigate the load distribution on the feet of a healthy running adult wearing barefoot shoes through experimental work and finite element analysis (FEA). The methodology used in this study included experimental as well FEA. Tests were conducted with a 175-lb adult subject wearing a pair of minimalist shoes. Experimental data were collected and used to perform Finite Element Analysis. The barefoot shoes were modeled with an equivalent thickness of 0.453 inch, and the following parameters were experimentally determined such as the Young’s modulus of 467 psi, a density of 0.0025 lb/in3, and a Poisson’s ratio of 0.08. The simulation results yielded a maximum compressive stress of 38.71 psi in the toe region. This stress level was approximately one-half of the stresses generated in the heel region of conventional sport shoes. This study, further, revealed the reduction of stresses at the heel region with barefoot shoes resulting in lower risk of pain and injury to the foot in the absence of impact transients ordinarily experienced with conventional shoes.
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Muñoz, David. „New strategies in proprioception’s analysis for newer theories about sensorimotor control“. In Systems & Design 2017. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/sd2017.2017.6903.
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Abstract Human’s motion and its mechanisms had become interesting in the last years, where the medecine’s field search for rehabilitation methods for handicapped persons. Other fields, like sport sciences, professional or military world, search to distinguish profiles and ways to train them with specific purposes. Besides, recent findings in neuroscience try to describe these mechanisms from an organic point of view. Until now, different researchs had given a model about control motor that describes how the union between the senses’s information allows adaptable movements. One of this sense is the proprioception, the sense which has a quite big factor in the orientation and position of the body, its members and joints. For this reason, research for new strategies to explore proprioception and improve the theories of human motion could be done by three different vias. At first, the sense is analysed in a case-study where three groups of persons are compared in a controlled enviroment with three experimental tasks. The subjects belong to each group by the kind of sport they do: sedentary, normal sportsmen (e.g. athletics, swimming) and martial sportmen (e.g. karate, judo). They are compared thinking about the following hypothesis: “Martial Sportmen have a better proprioception than of the other groups’s subjects: It could be due to the type of exercises they do in their sports as empirically, a contact sportsman shows significantly superior motor skills to the members of the other two groups. The second via are records from encephalogram (EEG) while the experimental tasks are doing. These records are analised a posteriori with a set of processing algorithms to extract characteristics about brain’s activity of the proprioception and motion control. Finally , the study tries to integrate graphic tools to make easy to understand final scientific results which allow us to explore the brain activity of the subjects through easy interfaces (e.g. space-time events, activity intensity, connectivity, specific neural netwoks or anormal activity). In the future, this application could be a complement to assist doctors, researchers, sports center specialists and anyone who must improve the health and movements of handicapped persons. Keywords: proprioception, EEG, assesment, rehabilitation.References: Röijezon, U., Clark, N.C., Treleaven, J. (2015). Proprioception in musculoskeletal rehabilitation. Part 1: Basic science and principles of assessment and clinical interventions. ManualTher.10.1016/j.math.2015.01.008. Röijezon, U., Clark, N.C., Treleaven, J. (2015). Proprioception in musculoskeletal rehabilitation. Part 2: Clinical assessment and intervention. Manual Ther.10.1016/j.math.2015.01.009. 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Koessler, L., Maillard, L., Benhadid, A., Vignal, J.P., Felblinger, J., Vespignani, H., Braun, M. (2009). Automated cortical projection of EEG: Anatomical correlation via the international 10-10 system. Neuroimage. 10.1016/j.neuroimage.2009.02.006. Jurcak, V., Tsuzuki, Daisuke., Dan, I. (2007). 10/20, 10/10, and 10/5 systems revisited: Their validity as relativehead-surface-based positioning systems. Neuroimage. 10.1016/j.neuroimage.2006.09.024. Chuang, L.Y., Huang, C.J., Hung, T.M. (2013). The differences in frontal midline theta power between successful and unsuccessful basketball free throws of elite basketball players. Int. J. Psychophysiology.10.1016/j.ijpsycho.2013.10.002. Wang, C.H., Tsai, C.L., Tu, K.C., Muggleton, N.G., Juan, C.H., Liang, W.K. (2014). Modulation of brain oscillations during fundamental visuo-spatialprocessing: A comparison between female collegiate badmintonplayers and sedentary controls. Psychol. Sport Exerc. 10.1016/j.psychsport.2014.10.003. 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Vitali, Andrea, Daniele Regazzoni, Caterina Rizzi und Giorgio Lupi. „Low Cost Markerless Motion Capture Systems: A Comparison Between RGB Cameras and RGB-D Sensors“. In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24083.
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Abstract In the last years, the advent of low-cost markerless motion capture systems fostered their use in several research fields, such as healthcare and sport. Any system presents benefits and drawbacks that have to be considered to design a Mocap solution providing a proper motion acquisition for a specific context. In order to evaluate low-cost technology, this research work focuses on the evaluation of the accuracy of two categories of devices: the RGB active cameras and the RGB-D, or depth sensors devices. In particular, GoPro Hero 6 active cameras and Microsoft Kinect v2 devices have been selected as representative of the two categories. In particular, this work evaluates and compares the performances of the two systems used to track the position of human articulations. The two devices have been chosen among those available on the market after a state of the art has been completed. Before starting with the campaign of acquisition, the number of sensors and their layout have been designed to optimize the acquisition with both mark-less Mocap systems. Their comparison is based on a list of specific movements of upper and lower limbs. Each movement has been acquired simultaneously, to guarantee the same test conditions. The results have been organized, compared and discussed by evaluating performances and limitations of both solutions related to specific context of use. Conclusions highlight the best candidate technology.
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Miyoshi, Koji, und Masayuki Kamaya. „Variable Loading Sequence Effect for Thermal Fatigue at a Mixing Tee“. In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93267.
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Abstract Mixing flow causes fluctuations in fluid temperature near the pipe wall and may result in fatigue crack initiation. In a previous study, the authors reported the characteristics of the thermal stress to cause thermal fatigue at a mixing tee. A large stress fluctuation was caused by movement of the hot spot, at which the pipe wall was heated by hot flow from the branch pipe. According to a general procedure, fatigue damage is calculated by the linear damage accumulation rule. However, it has been reported that Miner’s rule does not always predict the fatigue life conservatively for variable stress amplitude. In this study, we investigated the change in fatigue life due to variable strain around the hot spot. The time histories of the strain around the hot spot were estimated by finite element analysis (FEA) for which the temperature condition was determined by wall temperature measured in a mock-up test. Strain-controlled fatigue tests were conducted using smooth cylindrical specimens made of stainless steel. The fatigue damage at failure of the specimen was calculated using Miner’s rule. The calculated fatigue damage around the hot spot became less than unity and the minimum value was 0.18. Therefore, Miner’s rule predicted non-conservative fatigue life. In addition, the calculated fatigue damage inside the hot spot was larger than those outside the hot spot and at the position of maximum stress fluctuation. Fatigue tests using strain with periodic overload were also conducted in order to investigate the effect of the loading history on fatigue life. It was shown that the strain with periodic overload reduced the fatigue life. The calculated fatigue damage for the strain at the maximum position of stress fluctuation range seemed to be smaller than those at other positions. This implies that the fatigue life can be estimated conservatively from the viewpoint of the loading sequence effect by calculating the fatigue damage using Miner’s rule for the strain at the maximum position of stress fluctuation range.
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Gimunová, Marta, Tomáš Vodička, Kristián Jánsky, Miriam Kalichová, Antonín Zderčík, Alena Skotáková, Petr Hedbávný und Kateřina Kolářová. „The effect of classical ballet, Slovakian folklore dance and sport dance on static postural control in female and male dancers“. In 12th International Conference on Kinanthropology. Brno: Masaryk University Press, 2020. http://dx.doi.org/10.5817/cz.muni.p210-9631-2020-4.
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Purpose: Classical ballet, Slovakian folklore dance, and sport dance training differ in their way how to master the art of dance; however, postural control is essential for the correct exe-cution of complex movements used in all types of dance. The aim of this study was to analyse the differences in static postural control between classical ballet dancers, Slovakian folklore dancers and sport dancers and to analyse the effect of body mass, body height and toe grip strength on postural control. Methods: 68 dancers, between 17 to 28 years of age, participated in this study: 21 dancers from Slovakian folklore dance group VSLPT Poľana Brno (12 females, 9 males), 22 dancers from Brno Dance conservatory (16 females, 6 males) and 25 sport dancers competing at Brno Dance Open 2019 (12 females, 13 males). All participants were asked to stand upright, barefooted, arms along the body, both feet on the Emed-at platform (Novel GmbH, Germany) for 10 seconds with their eyes open to obtain the length of COP line (cm), average velocity of COP (cm/s), the elliptic area (mm2) and numerical eccentricity of the ellipse. The toe grip strength was measured for each foot when sitting using toe grip dynamometer (Takei Scien-tific Instruments, Niigata, Japan). To analyse the effect of dance style, to grip strength, body mass, body height, and gender on postural control variables, Kruskal Wallis test, and Spear-man Rank Order Correlation were used. Results: Abetter postural stability measured by the length and average velocity of COP was observed in sport dancers, compared to classical ballet and Slovakian folklore dancers. Sport dancers are used to a greater load on the forefoot and to a special foot roll-of pattern when dancing, which may lead together with a constantly changing environment during competi-tions to their enhanced postural stability. Despite the differences in dance training and dance footwear of female and male dancers (high-heel shoes in sport and Slovakian folklore female dancers, pointe shoes in female ballet dancers), no statistically significant difference in pos-tural variables between genders was observed. Similarly, in analysed dancers, no effect of age, body mass, and body weight on postural control were observed. The toe grip strength was not observed to affect the postural variables in this study. The greatest toe grip strength was observed in female ballet dancers, despite their younger age. Ballet dance training in-cludes repetitive exercises focused on foot and toes such as battement tendu or demi-pointe and en pointe positions probably resulting in the greater strength of the toes. Conclusion: In this study, better postural stability measured by the length and average ve-locity of COP was observed in sport dancers, compared to classical ballet and Slovakian folklore dancers. In analysed dancers, no effect of body mass, body weight, gender, and toe grip strength on postural control variables was observed. Future studies focused on postural stability changes in non-dancers after a sport dance, classical ballet and Slovakian folklore dance training program would provide additional knowledge about the process how each type of dance enhance the balance and other coordinative skills.
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Li, Qingzhao, Wei Wang, Hai Li, Yunfeng Jiang und Zhiyong Song. „Analysis of the Effect of Open and Close Angle of Workpiece Surface on Contour Error“. In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70021.
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The machining of complicated surface is a hot spot in manufacturing industry in nowadays. The complicated surfaces should be machined with five-axis machine tools because of its geometric characteristics. In this paper, the characteristic of workpiece surface called open and close angle of surface is defined. The transition area from open angle to close angle will cause the twist and singularity of the surface. The twist mainly affects the principle errors of surface. And the singularity will cause the mutation of rotation axis movement and make an influence on the contour errors. To test the influence of the open and close angle on the contour error, a workpiece with special surface characteristics is designed. With the theoretical, simulational and experimental analyses, the influence law from the open and close angle is found out. The conclusion can be helpful for the tool trajectory planning.
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Wa¨rmefjord, Kristina, Rikard So¨derberg und Lars Lindkvist. „Strategies for Optimization of Spot Welding Sequence With Respect to Geometrical Variation in Sheet Metal Assemblies“. In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38471.
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During the assembly process of sheet metal parts, a lot of factors affect the final geometrical quality. It is important to have knowledge about the characteristics of as many as possible of those factors, not only to be able to reduce their effect, but also to be able to include those factors in variation simulations. Those tolerance simulations are crucial tools in early stages in automotive industry in order to predict the outcome in critical dimensions and it is of course important to have as good accuracy as possible in the simulations. One of the factors affecting the final geometry is the spot welding sequence. In this paper it is shown how the spot welding sequence affects the amount of geometrical variation in a sheet metal assembly. A method for including the welding sequence in tolerance simulations is described. Of course, it is desirable to find an optimal sequence, i.e. a sequence that minimizes the geometrical variation in the final assembly. Since this is a fast growing problem — the number of possible sequences for N welding points is N!, it is not practicable to test all possible sequences. In this work some different strategies for finding an optimal sequence are tested on several industrial case studies. The tested strategies are based on general guidelines, on minimizing variation in each welding step respectively calculations of the movements in unwelded points in each step. The strategies based on general guidelines was not successful, neither was the one based on minimization of the variation in each step. The strategy based on movements in the unwelded points seems however promising. It resulted in the best or one of the better sequences for all of the eight tested industrial case studies.