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Seasonal variation in vitamin d status in elite athletes: a longitudinal study
Backx, E. M.P. van der Avoort, Cindy van Tieland, Michael Maase, K. Kies, A. K. Van Loon, Luc de Groot, Lisette C.P.G.M. Mensink, M.
Backx, E. M.P.
van der Avoort, Cindy van
Tieland, Michael
Maase, K.
Kies, A. K.
Van Loon, Luc
de Groot, Lisette C.P.G.M.
Mensink, M.
Abstract
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.
Keywords
25(OH)D, sports nutrition
Date
2017
Type
Journal article
Journal
International Journal of Sport Nutrition and Exercise Metabolism
Book
Volume
27
Issue
1
Page Range
6-10
Article Number
ACU Department
Centre for Exercise and Nutrition
Faculty of Health Sciences
Faculty of Health Sciences
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Relation URI
Source URL
Event URL
Open Access Status
License
File Access
Controlled