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)D concentration (>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 (
Original language | English |
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Pages (from-to) | 6-10 |
Number of pages | 5 |
Journal | International Journal of Sport Nutrition and Exercise Metabolism |
Volume | 27 |
Issue number | 1 |
DOIs | |
Publication status | Published - Feb 2017 |
Keywords
- 25(OH)D
- sports nutrition
- D SUPPLEMENTATION
- MUSCLE FUNCTION
- DOSE-RESPONSE
- D DEFICIENCY
- ADULTS
- PERFORMANCE
- INSULIN
- OZONE
- SKIN