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4000 IU increased peak power in exercise vs placebo April 2010

Effects of vitamin D supplementation during exercise training on strength and body composition

Andres E Carrillo1, Michael G Flynn3, Catherine Pinkston2, Melissa M Markofski1, Yan Jiang2, Shawn S Donkin2 and Dorothy Teegarden2
FASEB (Federation of American Societies of Experimental Biology) Journal Vol 24 April 2010 917.20
1 Department of Health and Kinesiology
2 Interdepartmental Nutrition Program, Purdue University, West Lafayette, IN
3 Department of Health and Human Performance, College of Charleston, Charleston, SC
The purpose of this study was to examine the effects of vitamin D supplementation (4,000 IU/day) during an exercise training intervention on body composition, muscular strength, and power. Overweight (BMI: 31.3 ± 3.2 kg/m2) adults (26.1 ± 4.7 years, n=23) were recruited during winter months and randomized into a vitamin D (Vit D, n = 10) or placebo (PL, n = 13) group. Both groups completed 12 wks (3 d/wk) of resistance exercise, and were asked to use the provided sunscreen daily. Vitamin D status (serum 25 hydroxyvitamin D (25OHD)) and body composition (DXA) were assessed at 0 and 12 wks, and muscular strength and power at 0, 4, 8, and 12 wks using Keiser pneumatic resistance equipment. Post 25OHD was increased in VitD (33.4 ± 7.2 ng/mL) compared to baseline (20.8 ± 8.3 ng/mL, p<0.05) and was significantly elevated compared to post PL (23.5 ± 6.0 ng/mL, p<.05). Power was higher, compared to baseline, in Vit D only at week 4 (Fig 1.). Post muscular strength and lean mass were increased in both groups (p<0.05) with no between group differences. Vitamin D supplementation during exercise training induced an early increase in muscular power, but did not alter other indices of muscle function.

4000 IU increased peak power in exercise vs placebo April 2010        

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