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Revista Brasileira de Medicina do Esporte
Print version ISSN 1517-8692
ZABKA, Felipe Furlan; VALENTE, Henrique Gonçalves and PACHECO, Adriana Moré. Isokinetic evaluation of knee extensor and flexor muscles in professional soccer players. Rev Bras Med Esporte [online]. 2011, vol.17, n.3, pp. 189-192. ISSN 1517-8692. http://dx.doi.org/10.1590/S1517-86922011000300008.
INTRODUCTION AND OBJECTIVE: Studies that relate parameters of muscular performance in different sports, and especially in soccer, have been frequently reported in the literature. However, the methodological variations among studies, the type of dynamometer used in each search and placement of each subject during the evaluations results in the divergence of the data collected. Therefore, the objective of this study was to perform a data collection to provide figures on the muscular profile and establish normative parameters for the professional soccer players' muscular performance, supporting scientific research and future studies. METHODS: The sample consisted of 39 athletes from a professional soccer club in Porto Alegre. In order to evaluate muscular performance, an isokinetic dynamometer was used and the tests consisted of maximal concentric contractions, being knee flexors and extensors muscles tested at 60º/s and 240º/s velocities. Analysis of means by t test (independent samples) was used to investigate significant differences between legs considering the parameters evaluated in this study. For all statistical procedures the confidence interval was 95% (p <0.05). RESULTS: The results of this study characterized the muscular profile of professional soccer players on the capacity of torque, work and maximum power, normalized by body weight. Moreover, significant differences were observed between legs considering some of the study's variables. CONCLUSION: The normative data set can be used as reference values for prevention, training and rehabilitation of athletes, and serve as reference for future studies with the aim to relate parameters of muscular performance and incidence of injuries in soccer.
Keywords : isokinetic dynamometer; muscle injury; muscle balance; knee; soccer.