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Collegiate Swimmers getting 4000 IU of vitamin D had fewer injuries – March 2013

The Effects of Season-Long Vitamin D Supplementation on Collegiate Swimmers and Divers.

Int J Sport Nutr Exerc Metab. 2013 Mar 8.
Lewis RM, Redzic M, Thomas DT.
Division of Clinical Nutrition, University of Kentucky, Lexington, KY.

The purpose of this 6-month randomized placebo controlled trial was to determine the effect of season-long (September-March) vitamin D supplementation on changes in vitamin D status (measured as 25(OH)D), body composition, inflammation, frequency of illness and injury. Forty-five male and female athletes were randomized to 4000IU vitamin D (n=23) or placebo (n=22). 25(OH)D, bone turnover markers (NTx and BSAP), and inflammatory cytokines (TNF-alpha, IL-6, and IL1-β) were measured at baseline, midpoint, and endpoint. Body composition was assessed by DXA and injury and illness data were collected.

All athletes had sufficient 25(OH)D (>32ng/mL) at baseline (mean: 57ng/mL). At midpoint and endpoint, 13% and 16% of the total sample had 25(OH)D <32ng/mL, respectively. 25(OH)D was not positively correlated with bone mineral density (BMD) in the total body, proximal dual femur, or lumbar spine. In men, total body (p=0.04) and trunk (p=0.04) mineral-free lean mass (MFL) were positively correlated with 25(OH)D.
In women, right femoral neck BMD (p=0.02) was positively correlated with 25(OH)D. 25(OH)D did not correlate with changes in bone turnover markers or inflammatory cytokines.

Illness (n=1) and injury (n=13) were not related to 25(OH)D; however, 77% of injuries coincided with decreases in 25(OH)D. Our data suggests that 4000IU vitamin D supplementation is an inexpensive intervention that effectively increased 25(OH)D, which was positively correlated to bone measures in the proximal dual femur and MFL. Future studies with larger sample sizes and improved supplement compliance are needed to expand our understanding of the effects of vitamin D supplementation in athletes.

PMID: 23475128

Wow: At the start of the trial they all had high levels of vitamin D.
This study probably started in the fall, just after the students had been out swimming during the summer
Even starting with a high blood level of vitamin D, adding more vitamin D helped.

See also VitaminDWiki

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