Preprint Article Version 1 This version is not peer-reviewed

The Relationship between Vitamin D Status and Rotator Cuff Muscle Strength in Professional Volleyball Athletes

Version 1 : Received: 23 September 2019 / Approved: 24 September 2019 / Online: 24 September 2019 (11:30:07 CEST)

How to cite: Kim, D.K.; Park, G.; Kuo, L.; Park, W.H. The Relationship between Vitamin D Status and Rotator Cuff Muscle Strength in Professional Volleyball Athletes. Preprints 2019, 2019090271 (doi: 10.20944/preprints201909.0271.v1). Kim, D.K.; Park, G.; Kuo, L.; Park, W.H. The Relationship between Vitamin D Status and Rotator Cuff Muscle Strength in Professional Volleyball Athletes. Preprints 2019, 2019090271 (doi: 10.20944/preprints201909.0271.v1).

Abstract

This study aimed to examine the vitamin D status of professional volleyball athletes and to determine its correlation with shoulder muscle strength. We finally included 52 healthy male professional volleyball players (23.2 ± 4.5 years), who were categorized by vitamin D status (<20 ng/mL: deficiency, 20-30 ng/mL: insufficiency, and >30 ng/mL: sufficiency). We examined the strength of the internal rotator (IR) and external rotator (ER) muscles of the shoulder by using isokinetic dynamometer. Fourteen players (26.9%) had vitamin D deficiency, 24 players (46.2%) were vitamin D insufficient, and 14 players (26.9%) were vitamin D sufficient. There was no significant correlation between the vitamin D level and shoulder muscle strength at 60°/s (IR, r = 0.159, p = 0.26; ER, r = 0.245, p = 0.08), and at 180°/s (IR, r = - 0.093, p = 0.51; ER, r = - 0.037, p = 0.79). Moreover, the isokinetic shoulder strengths were not significantly different across the three groups in all settings. In conclusion, vitamin D insufficiency was common in elite volleyball players. Though not being associated with isokinetic muscle weakness, vitamin D should be regularly monitored and supplemented in young elite athletes, considering its importance on musculoskeletal health.

Subject Areas

vitamin D; muscle strength; volleyball; athletes; shoulder

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