TY - JOUR T1 - Comparing Balance, Function, Strength and Endurance of Selected Core Muscles in Male Volleyball Players with and Without a Chronic Ankle Sprain in Bandar Abbas in 2018: A Descriptive Study TT - مقایسه تعادل، عملکرد، قدرت و استقامت عضلات منتخب مرکزی در والیبالیست‌های مرد با و بدون پیچ خوردگی مزمن مچ پای شهرستان بندرعباس در سال 1396: یک مطالعه توصیفی JF - RUMS_JOURNAL JO - RUMS_JOURNAL VL - 18 IS - 3 UR - http://journal.rums.ac.ir/article-1-4352-en.html Y1 - 2019 SP - 251 EP - 266 KW - Chronic ankle sprain KW - Valleyball KW - Strentgh KW - Endurance KW - Balance KW - Functional tests N2 - Background and Objectives: Ankle sprain is one of the most common injuries in valleyball players that reduces the strength of ankle muscles and this leads to reduced function and balance, and results in recurrence of injury. Therefore, the purpose of this study was to determine and compare balance, function, strength and endurance of selected core muscle groups in male volleyball players with and without an ankle sprain. Materials and Methods: In this descriptive study, 40 male volleyball players in Bandar Abbas clubs in 2018 with age range of 20-27 were randomly selected and divided into two groups with and without chronic ankle sprain. The number of subjects in each group was 20. McGill test, manual muscle testing (MMT), Y balance test, figure-eight jump and Side-to-Side Hop tests were used to measure trunk endurance, strength, balance and function of volleyball players of the two groups, respectively. Independent t-test was used to analyze the data. Results: Significant differences were observed between the groups in hip abduction (p=0.006), external rotation strength (p=0.020), the Sorensen test (p=0.018), 60° trunk flexion test (p=0.032), forward bridge (p=0.031), inferolateral (p=0.021) and inferomedial (p=0.008) of the Y balance test and total score of Y balance test (p=0.019), figure-eight jump (p=0.023) and Side-to-Side Hop test (p=0.033). Conclusion: The findings showed that the ankle sprain, if not accompanied by rehabilitation program, may have negative effect on strength, endurance, balance and performance of athletes. Accordingly, rehabilitation and balance exercises are recommended to prevent the possibility of recurrence. Key words: Chronic ankle sprain, Valleyball, Strentgh, Endurance, Balance, Functional tests Funding: This study did not have any funds. Conflict of interest: Non declared. Ethical approval: The Ethics Committee of Hormozgan University of Medical Sciences approved the study (IR.HUMS.REC.1397.223). How to cite this article: Abbaszadeh A, Delavari MA. Comparing Balance, Function, Strength and Endurance of Selected Core Muscles in Male Volleyball Players with and Without a Chronic Ankle Sprain in Bandar Abbas in 2018: A Descriptive Study. J Rafsanjan Univ Med Sci 2019; 18 (3): 251-266. [Farsi] M3 ER -