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Effect of vitamin D on muscle function and injury in elite adolescent dancers: A randomized double-blind study
Wyon, Matthew A Wolman, Roger Kolokythas, Nicolas Sheriff, Karen Galloway, Shaun Mattiussi, Adam
Wyon, Matthew A
Wolman, Roger
Kolokythas, Nicolas
Sheriff, Karen
Galloway, Shaun
Mattiussi, Adam
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2018-06-12
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Abstract
A number of studies have noted low levels of Vitamin D in dancers and this has been associated with increased risk of injuries and decreased muscular strength indices. The aim of the present study was to examine whether vitamin D supplementation over a 4-month period can improve muscle function and injury incidence. Eighty-four participants volunteered, exclusion criteria and drop out (19%) reduced cohort to 67 (f=29, m=38; 17-19yrs). Participants were randomly assigned to either an intervention or placebo group (2:1 ratio). All provided a venous blood sample pre and post the 4-month study period. The intervention group received 120,000IU vitamin D to be taken over a 1-week period and the placebo group received the same number of inert pills. Participants completed a series of muscle function tests pre and post the monitoring period. Injury incidence was recorded by the independent health team at the school. Pre-intervention 6% of the cohort were vitamin D deficient, 81% were insufficient and 13% had sufficient levels; post-intervention 53% were insufficient and 47% were sufficient. The intervention group reported a significant increase in serum 25(OH)D3 (57%; p<0.00) and isometric strength (7.8%; p=0.022) but not muscular power. There was a significant association between traumatic injury occurrence for the intervention and control groups (10.9% vs. 31.8%; p < .02). Vitamin D supplementation decreased the numbers of deficient and insufficient participants within this cohort. The intervention group reported a small significant increase in muscle strength that was negatively associated with traumatic injury occurrence.
Citation
Wyon, M.A., Wolman, R., Kolokythas, N., Sheriff, K., Galloway, S. and Mattiussi, A. (2018) Effect of Vitamin D on Muscle Function and Injury in Elite Adolescent Dancers: A Randomized Double-Blind Study, International Journal of Sports Physiology and Performance, 14(1), pp. 55–59. https://doi.org/10.1123/ijspp.2018-0084
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PubMed ID
29893596
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Journal article
Language
en
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Series/Report no.
ISSN
1555-0273