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Int J Sport Nutr Exerc Metab. 2017 Feb;27(1):6-10. doi: 10.1123/ijsnem.2016-0177. Epub 2016 Oct 6.

Seasonal Variation in Vitamin D Status in Elite Athletes: A Longitudinal Study.

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 (<50 nmol/L) in late winter.

KEYWORDS:

25(OH)D; sports nutrition

PMID:
27710147
DOI:
10.1123/ijsnem.2016-0177
[Indexed for MEDLINE]

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