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The influence of winter vitamin D supplementation on muscle function and injury occurrence in elite ballet dancers: A controlled study

  • Matthew A. Wyon
    Correspondence
    Corresponding author.
    Affiliations
    Research Centre for Sport Exercise and Performance, University of Wolverhampton, Walsall, UK

    Jerwood Centre for the Prevention and Treatment of Dance Injuries, Birmingham, UK

    National Institute of Dance Medicine and Science, UK
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  • Yiannis Koutedakis
    Affiliations
    Research Centre for Sport Exercise and Performance, University of Wolverhampton, Walsall, UK

    Institute of Human Performance and Rehabilitation, CERETETH, Trikala, Greece

    Department of Sport and Exercise Sciences, University of Thessaly, Trikala, Greece
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  • Roger Wolman
    Affiliations
    National Institute of Dance Medicine and Science, UK

    Department of Rheumatology and Sport and Exercise Medicine, Royal National Orthopaedic Hospital, Stanmore, UK
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  • Alan M. Nevill
    Affiliations
    Research Centre for Sport Exercise and Performance, University of Wolverhampton, Walsall, UK
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  • Nick Allen
    Affiliations
    Research Centre for Sport Exercise and Performance, University of Wolverhampton, Walsall, UK

    Jerwood Centre for the Prevention and Treatment of Dance Injuries, Birmingham, UK

    National Institute of Dance Medicine and Science, UK
    Search for articles by this author

      Abstract

      Objectives

      Athletes who train indoors during the winter months exhibit low serum 25-hydroxyvitamin D [25(OH)D] concentrations due to a lack of sunlight exposure. This has been linked to impaired exercise performance. The purpose of this study was to assess the effects of oral vitamin D3 supplementation on selected physical fitness and injury parameters in elite ballet dancers.

      Design

      Controlled prospective study.

      Methods

      24 elite classical ballet dancers (intervention n = 17; control n = 7) participated in a controlled 4-month oral supplementation of vitamin D3 (2000 IU per day). Isometric muscular strength and vertical jump height were measured pre and post intervention. Injury occurrence during the intervention period was also recorded by the in-house medical team. Repeated measures ANOVA and Mann–Whitney-U statistical tests were used and significance was set at p ≤ 0.05.

      Results

      Significant increases were noted for the intervention group for isometric strength (18.7%, p < 0.01) and vertical jump (7.1%, p < 0.01). The intervention group also sustained significantly less injuries than the controls during the study period (p < 0.01).

      Conclusions

      Oral supplementation of vitamin D3 during the winter months has beneficial effects on muscular performance and injury occurrence in elite ballet dancers.

      Keywords

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