Pages: 19-28

Abstract

Objective: Lateral ankle sprain is one of the most common injuries in sports. The purpose of the present study is comparison between function, strength and endurance of selected central muscle in volleyball players with and without chronic ankle instability. Material and methods: A total of 40 female volleyball player (age=24 years) were participated in this study. McGill endurance tests, MMT, Y balance test, Figure-eight jump and lateral jump test were used to measure trunk endurance, strength, balance and function of volleyball players of two groups, respectively. Results: According to the results of an independent t-test, significant differences were observed between groups including thigh abduction (p=0.006) and thigh’s external rotation strength (p=0.02), the Sorensen test (p=0.02), 60° flexion test (p=0.02), abdominal bridge (p-0.03), internal posterior directions (p=0.02) and external posterior directions (p=0.08), Y balance test and total Y test (p=0.008), Figure-eight hop tests (p=0.02) and lateral jump test (p=0.03) in the two groups including with and without chronic ankle instability. Conclusion: According to the results, if the previous ankle sprain as a factor is accompanied with lack of rehabilitation program, this can have a negative impact on athletes’ strength and endurance of the trunk and thigh region, balance and performance. Accordingly, using rehabilitation and training programs of the thigh and trunk region and also balance training are suggested in order to prevent recurrence of ankle sprain.