The effect of Physical fatigue on balance in teenage soccer players with knee dynamic valgus defect

Subject Areas : Sports Injuries and Corrective Training

Abouzar Kojori geshniani ¹ (Ministry of Education)
Mahdieh Gholamnia ² (B.Sc., Department of Exercise Physiology, University of Mazandaran, Iran. )

Received: 2024-05-14 Accepted : 2024-06-30 Published : 2024-07-20

Keywords: Physical Fatigue, Soccer, Static Balance, Dynamic Balance, Dynamic Knee Valgus,

Abstract :

The present study was conducted with the aim of investigating the effect of fatigue on balance, proprioception and jump-landing performance in teenage soccer players with dynamic knee valgus defect. In order to carry out this study, 30 male soccer players were selected and divided into two control groups (Age: 15.46 ± 0.51 years, Height: 1.70 ± 0.05 m, Weight: 63.20 ± 4.84 kg, Body Mass Index: 21.79 ± 0.91 kg/m2, sports history: 6.00 ± 1.41 years) and experimental (Age: 15.26 ± 0.45 years, Height: 1.71 ± 0.04) m, Weight: 65.33 ± 4.71 kg, Body Mass Index: 22.22 ± 1.63 kg/m2, sports history: 6.66 ± 2.52 years). In this study, after selecting the subjects with valgus defect, knee dynamics were evaluated with the tuck jump test. Then, Stork and Y tests were used to evaluate static balance and dynamic balance, respectively. After evaluating the variables, the subjects were divided into two control and experimental groups, and the special soccer fatigue protocol (SOFT90) was applied to the experimental group. After applying fatigue, the groups were re-evaluated. The results of this study showed that fatigue has a significant effect on reducing static balance (P=0.001), different directions of dynamic balance and its total score (P≤0.01). Also, the results related to the comparison between groups showed that fatigue led to the difference in the investigated variable between the two groups (P≤0.01). The results of this study showed that fatigue was an important factor in reducing balance. Therefore, it seems that reducing knee dynamic valgus defect, improving motor performance pattern and improving fit in muscle strength and balance can lead to reducing the risk of injury in fatigue conditions.

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