Muscle and tendon tissue properties of competitive soccer goalkeepers and midfielders     

Andreas Konrad  Markus Tilp 《Sportwissenschaft》2018,48(2):245-251

The purpose of this pilot study was to investigate the effect of playing-position-dependent training routines in soccer on the various muscle–tendon parameters. We hypothesized that there would be differences in such parameters between competitive goalkeepers and midfielders. According to their playing position, 21 healthy volunteers were assigned to goalkeeper (n?=?7), midfielder (n?=?7), and control (n?=?7) groups. To investigate the muscle–tendon parameters, we determined the maximum dorsiflexion range of motion and the corresponding muscle thickness, fascicle length, and pennation angle of the gastrocnemius medialis. Passive resistive torque and maximum voluntary contraction were measured with a dynamometer. Observation of muscle–tendon junction displacement with ultrasound allowed us to determine length changes in the tendon and muscle, respectively, and hence to calculate stiffness. There was no significant difference in range of motion, passive resistive torque, muscle–tendon stiffness, and the examined structural parameters (e.g., tendon stiffness) between the three groups. However, we found a significant difference in maximum voluntary contraction torque between the goalkeepers and midfielders vs. the controls, but not between the athlete groups. Habitual training leads to higher muscle strength in soccer players compared to less active persons. However, soccer training does not lead to specific muscle and tendon architecture adaptations according to playing position or when compared to less active persons.  相似文献   

Injuries in formal and informal non-professional soccer – an overview of injury context,causes, and characteristics     

Angela Gebert  Markus Gerber  Uwe Pühse  Philippe Gassmann  Hanspeter Stamm  Markus Lamprecht 《European Journal of Sport Science》2018,18(8):1168-1176

The objective of this study is to analyse context, causes, and characteristics of injuries in non-professional soccer. Therefore, a retrospective telephone survey was carried out with persons who were injured while playing soccer and who reported this accident to the Swiss National Accident Insurance Fund (Suva). Based on these data, an analysis of 708 soccer injuries was performed. The findings show that 30.1% of the injuries occurred during informal soccer play, and 75.4% of the injured persons were soccer club members. 53.0% of all injuries were caused by contact and 29.5% by foul play. Foul play was not associated with injury severity. With respect to injury severity, twisting/turning and being tackled by an opponent were identified as the most influental injury causes. Moreover, the risk of being severely injured was particularly high players of the 30+/40+ amateur leagues. In conclusion, the findings highlight that 30+/40+ league players are a major target group for the prevention of severe soccer injuries. Soccer clubs may constitute an appropriate multiplier for implementing prevention strategies such as fair play education, healthy play behaviours, and prevention programmes. Finally, a better understanding of injury situations leading to severe injuries is needed to improve injury prevention.  相似文献   

Tips for K-12 educators for helping students communicate and create using visual motion media,photography, and technology     

Wolfgang Karl  Markus Leberecht  Michael Oberhuber 《TechTrends》2009,53(1):14-15

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Managing the organisation 2.0: Entrepreneurial spirit and general management competences as early indicators for cluster success and sustainable regional development: Findings from the German Entrepreneurial Regions Programme     

Christiane Gebhardt  Markus C. Pohlmann 《The Journal of High Technology Management Research》2013,24(2):153-160

During the last twenty years the German programme family Entrepreneurial Regions has formed a landscape of strategy driven clusters, characterized by networking relationships along the value chain between SME, university and research laboratories. Initiated by the Federal Government the Entrepreneurial Regions Programme (ERP) was directed at rebooting East Germany's innovative strength and reviving the declined industrial basis as well as integrating the small technology oriented firms, remnants from GDR research labs into the global economy. The study carried out in 2010 and 2011 was based on a multi-method approach and went beyond traditional quantitative indicators such as turnover, job growth and number of patents, by focusing on interrelated qualitative and early indicators in a systemic approach. Apart from the continuity of Financial Investments, General Management Competences, Networking competences as well as Entrepreneurial Thinking and Acting were identified to be relevant key drivers for many other interconnected indicators of cluster development. We discuss the integration of Management Science into the context of regional innovation, organizational studies and industrial strategy and will shed light on the policy implications for the assessment and monitoring of clusters as well as on the management requirements of clusters. An outcome of our study is an indicator system that enriches the conventional indicator set for the evaluation of robustness and viability of politically initiated clusters.  相似文献   

Optimising technical skills and physical loading in small-sided basketball games     

Markus J. Klusemann  David B. Pyne  Carl Foster  Eric J. Drinkwater 《Journal of sports sciences》2013,31(14):1463-1471

Abstract

Differences in physiological, physical, and technical demands of small-sided basketball games related to the number of players, court size, and work-to-rest ratios are not well characterised. A controlled trial was conducted to compare the influence of number of players (2v2/4v4), court size (half/full court) and work-to-rest ratios (4x2.5 min/2x5 min) on the demands of small-sided games. Sixteen elite male and female junior players (aged 15–19 years) completed eight variations of a small-sided game in randomised order over a six-week period. Heart rate responses and rating of perceived exertion (RPE) were measured to assess the physiological load. Movement patterns and technical elements were assessed by video analysis. There were ～60% more technical elements in 2v2 and ～20% more in half court games. Heart rate (86 ± 4% & 83 ± 5% of maximum; mean ± SD) and RPE (8 ± 2 & 6 ± 2; scale 1–10) were moderately higher in 2v2 than 4v4 small-sided games, respectively. The 2v2 format elicited substantially more sprints (36 ±12%; mean ±90% confidence limits) and high intensity shuffling (75 ±17%) than 4v4. Full court games required substantially more jogging (9 ±6%) compared to half court games. Fewer players in small-sided basketball games substantially increases the technical, physiological and physical demands.  相似文献   

Parallel assessment of nutrition and activity in athletes: Validation against doubly labelled water, 24-h urea excretion,and indirect calorimetry     

Karsten Koehler  Hans Braun  Markus De Marées  Gerhard Fusch  Christoph Fusch  Joachim Mester 《Journal of sports sciences》2013,31(13):1435-1449

Abstract

The assessment of nutrition and activity in athletes requires accurate and precise methods. The aim of this study was to validate a protocol for parallel assessment of diet and exercise against doubly labelled water, 24-h urea excretion, and respiratory gas exchange. The participants were 14 male triathletes under normal training conditions. Energy intake and doubly labelled water were weakly associated with each other (r = 0.69, standard error of estimate [SEE] = 304 kcal · day^?1). Protein intake was strongly correlated with 24-h urea (r = 0.89) but showed considerable individual variation (SEE = 0.34 g · kg^?1 · day^?1). Total energy expenditure based on recorded activities was highly correlated with doubly labelled water (r = 0.95, SEE = 195 kcal · day^?1) but was proportionally biased. During running and cycling, estimated exercise energy expenditure was highly correlated with gas exchange (running: r = 0.89, SEE = 1.6 kcal · min^?1; cycling: r = 0.95, SEE = 1.4 kcal · min^?1). High exercise energy expenditure was slightly underestimated during running. For nutrition data, variations appear too large for precise measurements in individual athletes, which is a common problem of dietary assessment methods. Despite the high correlations of total energy expenditure and exercise energy expenditure with reference methods, a correction for systematic errors is necessary for the valid estimation of energetic requirements in individual athletes.  相似文献   

Data Mining in Elite Sports: A Review and a Framework     

Bahadorreza Ofoghi  John Zeleznikow  Clare MacMahon  Markus Raab 《Measurement in physical education and exercise science》2013,17(3):171-186

Sophisticated data analytical methods such as data mining, where the focus is upon exploration and developing new insights, are becoming increasingly useful tools in analysing elite sports performance data and supporting decision making that is crucial to gaining success. In this article, we investigate the different data mining demands of elite sports with respect to a number of features that describe sport competitions. The aim is to more structurally connect the sports and data mining domains through: (a) describing a framework for categorizing elite sports, and (b) understanding the analytical demands of different performance analysis problems. Therefore, we review different aspects such as sport categories and performance analysis requirements that influence each stage in sports data mining. We also present a model bringing together performance analysis requirements, data mining methods, data mining techniques, and technique characteristics. This will assist both data scientists and sport professionals to more effectively collaborate and contribute to success in elite sport events.  相似文献   

Portale Hypertension     

Bernhard Angermayr  Markus Peck-Radosavljevic 《Wiener klinische Wochenschrift Education》2008,3(2):107-118

Ohne Zusammenfassung  相似文献   

Using automatic item generation to meet the increasing item demands of high-stakes educational and occupational assessment     

Martin E. Arendasy  Markus Sommer 《Learning and individual differences》2012,22(1):112-117

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Associations Between Teacher-Rated Versus Self-Rated Student Temperament and School Achievement     

Sari Mullola  Mirka Hintsanen  Markus Jokela  Jari Lipsanen  Saija Alatupa  Niklas Ravaja 《Scandinavian Journal of Educational Research》2014,58(2):147-172

This study examined whether teacher-rated versus self-rated student temperaments are different in relation to the school grades in Maths and Mother language (ML) instruction in a nationally representative sample of Finnish Secondary School students (n?=?1,063, mean age 15.1 years). The results indicated that teacher-rated temperament was more strongly associated with students' Maths and ML grades than self-rated temperament. All the teacher-rated temperament traits were associated with school grades, accounting for 38% and 45% of the variance in Maths and ML, respectively. Of the self-rated temperaments, high task orientation and its components, high persistence and low distractibility, were associated with better school grades both in Maths and ML. Low reactivity and low negative emotionality were associated only with better ML grades, whereas high inhibition was associated only with better Maths grades. A temperament-conscious education needs to be taken into account in future teacher training.  相似文献