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

Evelien Backx, Cindy van der Avoort, Michael Tieland, Kamiel Maase, Arie Kies, Luc van Loon, Lisette de Groot, Marco Mensink*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Web of Science)

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 languageEnglish
Pages (from-to)6-10
Number of pages5
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Volume27
Issue number1
DOIs
Publication statusPublished - Feb 2017

Keywords

  • 25(OH)D
  • sports nutrition
  • D SUPPLEMENTATION
  • MUSCLE FUNCTION
  • DOSE-RESPONSE
  • D DEFICIENCY
  • ADULTS
  • PERFORMANCE
  • INSULIN
  • OZONE
  • SKIN

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