Purpose: 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 muscle-strength indices. The aim of the present study was to examine whether vitamin D supplementation over a 4-mo period can improve muscle function and injury incidence. Methods: A total of 84 participants volunteered; exclusion criteria and dropout (19%) reduced the cohort to 67 participants (females = 29 and males = 38; 17–19 y). Participants were randomly assigned to either an intervention or placebo group (2∶1 ratio). All provided a venous blood sample before and after the 4-mo study period. The intervention group received 120,000 IU vitamin D to be taken over a 1-wk period, and the placebo group received the same number of inert pills. Participants completed a series of muscle function tests before and after the monitoring period. Injury incidence was recorded by the independent health team at the school. Results: Preintervention, 6% of the cohort were vitamin D deficient, 81% were insufficient, and 13% had sufficient levels; postintervention, 53% were insufficient and 47% were sufficient. The intervention group reported a significant increase in serum 25(OH)D3 (57%; P < .00) and isometric strength (7.8%; P = .022) but not muscle power. There was a significant association between traumatic injury occurrence for the intervention and control groups (10.9% vs 31.8%; P < .02). Conclusion: Vitamin D supplementation decreased the numbers of deficient and insufficient participants in this cohort. The intervention group reported a small significant increase in muscle strength that was negatively associated with traumatic injury occurrence.
Matthew A. Wyon, Roger Wolman, Nicolas Kolokythas, Karen Sheriff, Shaun Galloway and Adam Mattiussi
Teri Riding McCabe, Jatin P. Ambegaonkar, Matthew Wyon and Emma Redding
The female dancer’s technique in DanceSport involves keeping the upper body and head poised in extension and left rotation. Attempting to maintain this position while dancing can lead to an extension neck injury (ENI).
The aim of this online survey was to discover the prevalence of ENI among female ballroom dancers.
Design and Participants:
Female DanceSport competitors (N = 127) completed an online survey.
Twenty-fve percent reported having ENI, and 68% of ENI occurred at competitions. Younger dancers (mean age = 20 ± 4.8 years) were significantly (p < .003) more likely to have ENI than older dancers (mean age = 34 ± 12.9 years).
ENI is prevalent in DanceSport competitors. Dance medicine professionals should consider this when designing injury prevention programs.