Vitamin D Status Relative to Diet, Lifestyle, Injury, and Illness in College Athletes
- 1 February 2011
- journal article
- Published by Ovid Technologies (Wolters Kluwer Health) in Medicine & Science in Sports & Exercise
- Vol. 43 (2), 335-343
- https://doi.org/10.1249/mss.0b013e3181eb9d4d
Abstract
Vitamin D deficiency is endemic in the general population; however, there is much to be learned about the vitamin D status of athletes. Purpose: The purposes of this study were to assess the prevalence of vitamin D insufficiency in collegiate athletes and to determine whether 25(OH)D concentrations are related to vitamin D intake, sun exposure, body composition, and risk for illness or athletic injury. Methods: 25(OH) vitamin D concentrations were measured in 41 athletes (18 men/23 women, 12 indoor/29 outdoor athletes) throughout the academic year. Dietary intake and lifestyle habits were assessed via questionnaire, bone density was measured by dual energy x-ray absorptiometry, and injury and illness were documented as part of routine care. Results: The 25(OH)D concentrations changed across time (P = 0.001) and averaged 49.0 ± 16.6, 30.5 ± 9.4, and 41.9 ± 14.6 ng·mL−1 (mean ± SD) in the fall, winter, and spring, respectively, and were higher in outdoor versus indoor athletes in the fall (P < 0.05). Using 40 ng·mL−1 as the cutoff for optimal status, 75.6%, 15.2%, and 36.0% of athletes had optimal status in the fall, winter, and spring, respectively. 25(OH)D concentrations were significantly (P < 0.05) correlated with multivitamin intake in the winter (r = 0.39) and tanning bed use in the spring (r = 0.48); however, status was otherwise not related to intake, lifestyle factors, or body composition. 25(OH)D concentrations in the spring (r = −0.40, P = 0.048) was correlated with frequency of illness. Conclusions: Our results suggest that collegiate athletes can maintain sufficient status during the fall and spring but would benefit from supplementation during the winter to prevent seasonal decreases in 25(OH)D concentrations. Results further suggest that insufficient vitamin D status may increase risk for frequent illness. Future research is needed to identify whether vitamin D status influences injury risk during athletic training or competition.This publication has 29 references indexed in Scilit:
- Vitamin D Status of Females in an Elite Gymnastics ProgramClinical Journal of Sport Medicine, 2008
- Vitamin D DeficiencyThe New England Journal of Medicine, 2007
- Factors that influence the cutaneous synthesis and dietary sources of vitamin DArchives of Biochemistry and Biophysics, 2007
- Who, what, where and when—influences on cutaneous vitamin D synthesisProgress in Biophysics and Molecular Biology, 2006
- Epidemic influenza and vitamin DEpidemiology and Infection, 2006
- Association Between Serum 25(OH)D Concentrations and Bone Stress Fractures in Finnish Young MenJournal of Bone and Mineral Research, 2006
- Human Antimicrobial Peptides: Defensins, Cathelicidins and HistatinsBiotechnology Letters, 2005
- Risk factors for clinical stress fractures in male military recruits: A prospective cohort studyBone, 2005
- The Intensity Level of Physical Exercise and the Bone Metabolism ResponseInternational Journal of Sports Medicine, 2005
- 1,25-dihydroxyvitamin D3 inhibits cytokine production by human blood monocytes at the post-transcriptional levelCytokine, 1992