Association between vitamin D status and testosterone and cortisol in ice hockey players
Deutscher übersetzter Titel: | Zusammenhang zwischen Vitamin-D-Status, Testosteron und Cortisol bei Eishockeyspielern |
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Autor: | Fitzgerald, John S.; Orysiak, Joanna; Wilson, Patrick B.; Mazur-Rózycka, Joanna; Obminski, Zbigniew |
Erschienen in: | Biology of sport |
Veröffentlicht: | 35 (2018), 3, S. 207-213, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0860-021X, 2083-1862 |
DOI: | 10.5114/biolsport.2018.74631 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201810007115 |
Quelle: | BISp |
Abstract des Autors
The identification of the vitamin D receptor in tissues related to testosterone and cortisol production, in conjunction with the observed correlations between vitamin D levels and these hormones in the general population, suggest vitamin D may influence testosterone and cortisol concentrations in athletes. A cross sectional study design was used to evaluate the association between 25(OH)D and testosterone and cortisol concentrations in young male ice hockey players (n = 50). All athletes were recruited during October from the Sosnowiec area, Poland (50° N). Commercially available ELISA kits were used to determine total serum 25(OH)D, testosterone and cortisol concentrations. Serum 25(OH)D concentration was analyzed as both a continuous and dichotomous variable, binned at the criteria for deficiency (< 20 ng/ml), to investigate a threshold effect. Neither continuous (r = 0.18, p = 0.20) nor dichotomous (r = 0.16, p = 0.27) 25(OH)D concentration was significantly correlated with testosterone concentration. A small, inverse correlation (r = -0.30, p = 0.04) was detected between 25(OH)D and cortisol concentrations when analyzed as a dichotomous variable only. Serum 25(OH)D concentration was neither associated with testosterone (p = 0.09) nor cortisol concentrations (p = 0.11) after adjusting for age, fat free mass and fat mass in sequential linear regression. The inability of vitamin D status to independently predict testosterone and cortisol concentrations suggests that any performance enhancing effects of vitamin D in athletes are unlikely to be mediated primarily through these hormones, at least amongst young male ice-hockey players.