Open AccessVitamin D status and its relation to exercise performance and iron status in young ice hockey players
Author(s) -
Joanna Orysiak,
Joanna Mazur–Różycka,
John S. Fitzgerald,
Michał Starczewski,
Jadwiga Malczewska-Lenczowska,
Krzysztof Buśko
Publication year - 2018
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0195284
Subject(s) - sprint , isometric exercise , ice hockey , vitamin d and neurology , vertical jump , medicine , athletes , vitamin , physical therapy , vitamin d deficiency , endocrinology , physiology , zoology , chemistry , jump , physical medicine and rehabilitation , biology , physics , quantum mechanics
Objectives The aim was to examine the association between serum vitamin D concentration and isometric strength of various muscle groups, vertical jump performance, and repeated sprint ability in young ice hockey players. The secondary aim was to determine the association between vitamin D deficiency and indices of iron status. Methods Fifty male ice hockey players (17.2±0.9 years) participated in this cross-sectional study. Exercise performance was evaluated using isometric strength measures of upper and lower extremities, vertical jump performance and repeated sprint ability (RSA). Blood samples were collected for the determination of serum 25-hydroxyvitamin D (25(OH)D) and multiple indicies of iron status. Results The mean serum 25(OH)D concentration was 30.4 ng·ml -1 and ranged from 12.5 to 91.4 ng·ml -1 . Eleven participants (22%) had vitamin D deficiency and 20 athletes (40%) had vitamin D insufficiency. Serum 25(OH)D concentration was not positively correlated with isometric muscle strength, vertical jump performance, or RSA after adjusting for age, training experience, fat mass, fat free mass and height. Serum 25(OH)D concentration was not associated with indices of iron status. Conclusion Vitamin D insufficiency is highly prevalent in ice hockey players, but 25(OH)D concentration but it is not associated with exercise performance or indices of iron status.