Matthew A Wyon1, Yiannis Koutedakis2, Roger Wolman3, Alan M Nevill4, Nick Allen5. 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 acontrolled 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.
RCT Entities:
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.
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