TY - JOUR
T1 - Seasonal variation in vitamin D status in elite athletes
T2 - a longitudinal study
AU - Backx, Evelien
AU - van der Avoort, Cindy
AU - Tieland, Michael
AU - Maase, Kamiel
AU - Kies, Arie
AU - van Loon, Luc
AU - de Groot, Lisette
AU - Mensink, Marco
PY - 2016
Y1 - 2016
N2 - 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 cur-rent study was to identify seasonal changes in total 25-hydroxyvitamin D (25(OH)D) concen-tration 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 concentra-tion was measured every three months (June, September, December, March, June). Addition-ally, 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.
AB - 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 cur-rent study was to identify seasonal changes in total 25-hydroxyvitamin D (25(OH)D) concen-tration 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 concentra-tion was measured every three months (June, September, December, March, June). Addition-ally, 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.
U2 - 10.1123/ijsnem.2016-0177
DO - 10.1123/ijsnem.2016-0177
M3 - Article
C2 - 27710147
SN - 1526-484X
VL - 27
SP - 6
EP - 10
JO - International journal of sport nutrition and exercise metabolism
JF - International journal of sport nutrition and exercise metabolism
IS - 1
ER -