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Vitamin D Supplementation and Physical Performance in Adolescent Swimmers.
Int J Sport Nutr Exerc Metab 2015; 25(4):317-25IJ

Abstract

It is hypothesized that vitamin D insufficiency in athletes might negatively affect sport performance. The objective of this study was to examine the effect of vitamin D3 supplementation on physical performance of adolescent swimmers with vitamin D insufficiency. Fifty-three adolescent competitive swimmers with vitamin D insufficiency (serum 25-hydroxyvitamin-D concentrations (25(OH)D) < 30 ng/ml, mean 24.2 ± 4.8 ng/ml) were randomized to receive 2,000 IU/day of vitamin D3 or placebo for 12 weeks. Swimming performance at several speeds, arm-grip strength, and one-legged balance, were measured before and after supplementation. The age-adjusted changes in performance variables during the study were compared between groups. 25(OH) D concentrations at study end were significantly higher in the vitamin group compared with the placebo group (29.6 ± 6.5 ng/ml vs. 20.3 ± 4.2 ng/ml, p < .001), yet only 48% of the vitamin group became vitamin D sufficient with this dosing. No between-group differences were found in the changes of the performance variables tested. No significant differences in performance were found between participants that became vitamin D sufficient, and those who did not. No significant correlation was found between the change in serum 25(OH)D and age-adjusted balance, strength or swimming performance at study end. Vitamin D3 supplementation that raised serum 25(OH)D concentrations by a mean of 9.3 ng/ml above placebo in adolescent swimmers with vitamin D insufficiency, did not improve physical performance more than placebo.

Authors+Show Affiliations

Exercise, Nutrition and Lifestyle Clinic, The Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

25203157

Citation

Dubnov-Raz, Gal, et al. "Vitamin D Supplementation and Physical Performance in Adolescent Swimmers." International Journal of Sport Nutrition and Exercise Metabolism, vol. 25, no. 4, 2015, pp. 317-25.
Dubnov-Raz G, Livne N, Raz R, et al. Vitamin D Supplementation and Physical Performance in Adolescent Swimmers. Int J Sport Nutr Exerc Metab. 2015;25(4):317-25.
Dubnov-Raz, G., Livne, N., Raz, R., Cohen, A. H., & Constantini, N. W. (2015). Vitamin D Supplementation and Physical Performance in Adolescent Swimmers. International Journal of Sport Nutrition and Exercise Metabolism, 25(4), pp. 317-25. doi:10.1123/ijsnem.2014-0180.
Dubnov-Raz G, et al. Vitamin D Supplementation and Physical Performance in Adolescent Swimmers. Int J Sport Nutr Exerc Metab. 2015;25(4):317-25. PubMed PMID: 25203157.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Vitamin D Supplementation and Physical Performance in Adolescent Swimmers. AU - Dubnov-Raz,Gal, AU - Livne,Netachen, AU - Raz,Raanan, AU - Cohen,Avner H, AU - Constantini,Naama W, PY - 2014/9/10/entrez PY - 2014/9/10/pubmed PY - 2016/6/16/medline SP - 317 EP - 25 JF - International journal of sport nutrition and exercise metabolism JO - Int J Sport Nutr Exerc Metab VL - 25 IS - 4 N2 - It is hypothesized that vitamin D insufficiency in athletes might negatively affect sport performance. The objective of this study was to examine the effect of vitamin D3 supplementation on physical performance of adolescent swimmers with vitamin D insufficiency. Fifty-three adolescent competitive swimmers with vitamin D insufficiency (serum 25-hydroxyvitamin-D concentrations (25(OH)D) < 30 ng/ml, mean 24.2 ± 4.8 ng/ml) were randomized to receive 2,000 IU/day of vitamin D3 or placebo for 12 weeks. Swimming performance at several speeds, arm-grip strength, and one-legged balance, were measured before and after supplementation. The age-adjusted changes in performance variables during the study were compared between groups. 25(OH) D concentrations at study end were significantly higher in the vitamin group compared with the placebo group (29.6 ± 6.5 ng/ml vs. 20.3 ± 4.2 ng/ml, p < .001), yet only 48% of the vitamin group became vitamin D sufficient with this dosing. No between-group differences were found in the changes of the performance variables tested. No significant differences in performance were found between participants that became vitamin D sufficient, and those who did not. No significant correlation was found between the change in serum 25(OH)D and age-adjusted balance, strength or swimming performance at study end. Vitamin D3 supplementation that raised serum 25(OH)D concentrations by a mean of 9.3 ng/ml above placebo in adolescent swimmers with vitamin D insufficiency, did not improve physical performance more than placebo. SN - 1543-2742 UR - https://www.unboundmedicine.com/medline/citation/25203157/Vitamin_D_Supplementation_and_Physical_Performance_in_Adolescent_Swimmers_ L2 - https://journals.humankinetics.com/doi/10.1123/ijsnem.2014-0180 DB - PRIME DP - Unbound Medicine ER -