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    Vitamin D status in professional ballet dancers: Winter vs. summer.

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    Authors
    Wolman, Roger
    Wyon, Matthew A.
    Koutedakis, Yiannis cc
    Nevill, Alan M. cc
    Eastell, Richard
    Allen, Nick
    Issue Date
    2013-02-01
    
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    Abstract
    OBJECTIVE: Serum 25-hydroxyvitamin D is produced by the exposure of the skin to sunlight. Therefore athletes who train indoors, such as dancers, are vulnerable to vitamin D deficiency. The purpose of the study was to evaluate the serum 25-hydroxyvitamin D status in UK professional dancers during periods of reduced and increased sunlight exposure (i.e., winter vs. summer), and to assess the impact on bone metabolism and risk of injury. DESIGN: Cohort study. METHODS: 19 elite classical ballet dancers (age 26±8.86yr; height 1.66±8.84m; mass 54.3±10.47kg) were monitored over a 6 month period for 25-hydroxyvitamin D, PTH and blood serum bone turnover markers (CTX and PINP) along with injury data. Repeated measure ANOVA and Wilcoxon and Chi-square analyses were used and significance was set at p≤0.05. RESULTS: Significant changes were noted between the winter and summer test dates for 25-hydroxyvitamin D (14.9ng/ml vs. 23.9ng/ml; p<0.001), PTH (38.7pg/ml vs. 26.3pg/ml; p<0.001) and PINP (89.9ng/ml vs. 67.6ng/ml; p<0.01). The oral contraceptive had a significant effect on serum 25-hydroxyvitamin D, PTH and CTX. Soft tissue injuries were significantly lower in summer compared to winter period (winter=24, summer=13; p<0.05). CONCLUSIONS: Professional ballerinas characterized by a high incidence of low serum 25-hydroxyvitamin D levels which improve marginally in the summer. These dancers also demonstrate a higher injury incidence in the winter. Oral contraception seems to increase serum 25-hydroxyvitamin D levels and has a positive effect on bone metabolism.
    Citation
    Vitamin D status in professional ballet dancers: Winter vs. summer. 2013: J Sci Med Sport
    Journal
    Journal of science and medicine in sport / Sports Medicine Australia
    URI
    http://hdl.handle.net/2436/297895
    DOI
    10.1016/j.jsams.2012.12.010
    PubMed ID
    23379989
    Type
    Journal article
    Language
    en
    ISSN
    1878-1861
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jsams.2012.12.010
    Scopus Count
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    Faculty of Education, Health and Wellbeing

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