Document Type : Original Articles


1 Assistant Professor, Department of Exercise Physiology and Corrective Exercises, Urmia University, Urmia, Iran.

2 Department of Sport injury and Corrective Exercises, Urmia Branch, Islamic Azad University, Urmia, Iran



Background: The purpose of this study was to investigate the effect of a period of corrective exercises on balance and performance of volleyball girls' players with knee dynamic valgus defect.
Methods: The statistical population of this study was all female volleyball players in East Azarbaijan who had knee dynamic valgus defect. 30 subjects were selected from volleyball players with knee dynamic valgus defect. Subjects were randomly divided into control and experimental groups after completing the personal profile form and screening by squat test to diagnose knee dynamic valgus defects. static and dynamic balance was measured through BESS and Y balance tests of the lower limb and upper extremity function by using Y functional test for upper extremity were measured in both groups. The experimental group then performed the corrective exercises for 10 sessions, while the control group only did their specific exercises in volleyball. After the end of the training, subjects from both groups had a post test. First, the normality of the data was checked through the Shapiro–Wilk test. In order to determine the effect of the corrective exercise program on the dependent variables of the research, data were analyzed using covariance analysis and dependent T-test at the confidence level of (P ≤ 0.05).
Results: The Overall results indicated that corrective exercises had a positive effect on static and dynamic balance (P = 0.001) and upper extremity function (P = 0.001) of volleyball players with knee dynamic Valgus defect.
Conclusion: The results of study showed that the corrective exercise program with the approach of the National Academy of Sports Medicine has a significant effect on reducing dynamic valgus of the knee, improving the balance and upper extremity function among young female volleyball players.