Background: Vitamin D concentrations corresponding to 75 nmol/L of 25(OH)D or more have been related to maintained muscle function, growth and regeneration, to optimal bone health and immunology in athletes. The objective of this study was to investigate prevalence and predictors of insufficient 25(OH)D concentrations in athletes and to come up with recommendations for our Swiss athletes. Methods: 603 competitive Swiss athletes were assessed during their annual pre-participation examination. A standardized questionnaire was used to gather information about potential predictors for 25(OH)D concentrations.
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