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Nutrients 2016, 8(12), 775; doi:10.3390/nu8120775

Vitamin D and Weight Cycling: Impact on Injury, Illness, and Inflammation in Collegiate Wrestlers

1
Department of Family and Consumer Sciences, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA
2
Department of Athletics, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA
3
Dr. Bruce Hollis’ Laboratory at the Medical University of South Carolina, Charleston, SC 29425, USA
4
Department of Animal Sciences; University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA
*
Author to whom correspondence should be addressed.
Received: 28 August 2016 / Revised: 26 October 2016 / Accepted: 18 November 2016 / Published: 30 November 2016
(This article belongs to the Special Issue Nutrition, Health and Athletic Performance)
View Full-Text   |   Download PDF [678 KB, uploaded 30 November 2016]   |  

Abstract

This study explored the link between vitamin D status and frequency of skin infections, inflammation, and injury in college wrestlers during an academic year. Methods: Serum 25-hydroxyvitamin D (25(OH)D) (n = 19), plasma cytokine (TNF-α, IL-6, IL-10) (n = 18) concentrations, and body weight/composition were measured and injury/illness/skin infection data were collected in fall, winter, and spring. Results: In the fall, 74% of wrestlers had vitamin D concentrations <32 ng/mL which increased to 94% in winter and spring. Wrestlers lost an average of 3.4 ± 3.9 kg (p < 0.001) during the season with corresponding decreases in fat mass and increases in lean mass (p < 0.01). An inverse association between 25(OH)D concentrations and total body mass and body fat percentage was observed at all-time points (p < 0.01). Concentrations of cytokines were highly variable among individuals and did not change across time (p > 0.05). Correlations between vitamin D status, cytokines, or frequency of illness, injury, or skin infections were not observed. Conclusions: A high prevalence of vitamin D insufficiency (<32 ng/mL) and deficiency (<20 ng/mL) was observed in wrestlers and was associated with higher adiposity. It remains unclear if higher vitamin D status would reduce injury, illness, and skin infection risk. View Full-Text
Keywords: vitamin D; wrestling; exercise; athletes; inflammation vitamin D; wrestling; exercise; athletes; inflammation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Barcal, J.N.; Thomas, J.T.; Hollis, B.W.; Austin, K.J.; Alexander, B.M.; Larson-Meyer, D.E. Vitamin D and Weight Cycling: Impact on Injury, Illness, and Inflammation in Collegiate Wrestlers. Nutrients 2016, 8, 775.

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