Backx, E. M, van der Avoort, C. v, Tieland, M., Maase, K., Kies, A. K, Van Loon, L., de Groot, L. C & Mensink, M. (2017). Seasonal variation in vitamin d status in elite athletes: a longitudinal study. International Journal of Sport Nutrition and Exercise Metabolism,27(1), R. J. Maughan. 6-10. United States: Human Kinetics, Inc.. Retrieved from https://doi.org/10.1123/ijsnem.2016-0177
Studies monitoring Vitamin D status in athletes are seldom conducted for a period of 12 months or longer, thereby lacking insight into seasonal fluctuations. The objective of the current study was to identify seasonal changes in total 25-hydroxyVitamin D (25(OH)D) concentration throughout the year. Fifty-Two, mainly Caucasian athletes with a sufficient 25(OH)Dconcentration ( > 75 nmol/L) in June were included in this study. Serum 25(OH)D concentration was measured every three months (June, September, December, March, June). In addition, Vitamin D intake and sun exposure were assessed by questionnaires at the same time points. Highest total 25(OH)D concentrations were found at the end of summer (113 ± 26 nmol/L), whereas lowest concentrations were observed at the end of winter (78 ± 30 nmol/L). Although all athletes had a sufficient 25(OH)D concentration at the start of the study, nearly 20% of the athletes were deficient ( < 50 nmol/L) in late winter.
Mary MacKillop Institute for Health Research
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