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

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....

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Bibliographic Details
Published in:International journal of sport nutrition and exercise metabolism 2017-02, Vol.27 (1), p.6-10
Main Authors: Backx, Evelien, van der Avoort, Cindy, Tieland, Michael, Maase, Kamiel, Kies, Arie, van Loon, Luc, de Groot, Lisette, Mensink, Marco
Format: Article
Language:English
Subjects:
Adolescent
Adult
Afdeling Humane voeding
Athletes
Body Mass Index
Chair Nutrition and Health over the Lifecourse
Dietary Supplements
Female
Follow-Up Studies
Global Nutrition
HNE Nutrition and Health over the Lifecourse
HNE Voeding en Gezondheid in de Levenscyclus
Human Nutrition
Human Nutrition & Health
Human Nutrition (HNE)
Humane Voeding
Humane Voeding & Gezondheid
Humans
Longitudinal Studies
Male
Netherlands
Nutritional Status
Retrospective Studies
Seasons
Sports Nutritional Physiological Phenomena
Sunlight
Surveys and Questionnaires
Vitamin D - administration & dosage
Vitamin D - blood
VLAG
Wereldvoeding
Young Adult
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Summary: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 (
ISSN:1526-484X
1543-2742
DOI:10.1123/ijsnem.2016-0177