The effect of functional fatigue on timing of electromyography activity of quadriceps and hamstring muscles during single-leg jump-landing in female athletes
Oral Presentation XML
Paper ID : 1895-11THCONF
1university of tehran
2Assistant Professor of University of Tehran
Introduction: Previous studies have shown that fatigue at the end of sports events is one of the risk factors of ACL injury, causing changes of neuromuscular activity pattern of the muscles around the knee. But few studies have been examined the effect of functional fatigue in situations similar to real conditions of sports on neuromuscular factors affecting the ACL injury. So the aim of this study was to evaluate the effect of functional fatigue on timing of muscles which effecting in ACL injury, consist of vastus lateralis, vastus medialis, rectus femoris, biceps femoris and semitendinosus muscles, during single leg jump-landing task in female athletes.
Methodology: In this study, 15 volleyball, basketball and handball female athletes participated. Electromyography activity of the quadriceps and hamstring muscles were recorded during single leg jump-landing task. Multivariate analysis of variance with repeated measures was used at a significance level of 95% and alpha less than or equal to 0.05.
Results: According to the results,functional fatigue can cause a delay onset of vastus lateralis (p=0.002) and semitendinosus muscles (p=0.049); While there are no significant differences in onset of rectus femoris (p=0/143), vastus medialis (p=0/670) and biceps femoris muscles (p=0/226) between before and after functional fatigue.
Discussion: The results showed that functional fatigue can cause a delay onset of semitendinosus and vastus lateralis muscles, resulting changes in neuromuscular patterns of muscles activation in jump-landing task. This may be disposed ACL to injury. According to the results, appropriate training programs to increase muscle performance during fatigue is recommended.