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J Sci Med Sport. 2014 Jan;17(1):8-12. doi: 10.1016/j.jsams.2013.03.007. Epub 2013 Apr 23.

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

Author information

1
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. Electronic address: m.wyon@wlv.ac.uk.
2
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.
3
National Institute of Dance Medicine and Science, UK; Department of Rheumatology and Sport and Exercise Medicine, Royal National Orthopaedic Hospital, Stanmore, UK.
4
Research Centre for Sport Exercise and Performance, University of Wolverhampton, Walsall, UK.
5
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.

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:

Ballet; Injury; Isometric strength; Vertical jump; Vitamin D

PMID:
23619160
DOI:
10.1016/j.jsams.2013.03.007
[Indexed for MEDLINE]

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