Vitamin D status and its relation to exercise performance and iron status in young ice hockey players

Joanna Orysiak; Joanna Mazur-Rozycka; John Fitzgerald; Michal Starczewski; Jadwiga Malczewska-Lenczowska; Krzysztof Busko

doi:10.1371/journal.pone.0195284

Vitamin D status and its relation to exercise performance and iron status in young ice hockey players

PLoS One. 2018 Apr 9;13(4):e0195284. doi: 10.1371/journal.pone.0195284. eCollection 2018.

Authors

Joanna Orysiak¹, Joanna Mazur-Rozycka², John Fitzgerald³, Michal Starczewski⁴, Jadwiga Malczewska-Lenczowska¹, Krzysztof Busko⁵

Affiliations

¹ Department of Nutrition Physiology and Dietetics, Institute of Sport - National Research Institute, Warsaw, Poland.
² Central Institute For Labour Protection - National Research Institute (CIOP- PIB), Department of Ergonomics, Warsaw, Poland.
³ Department of Kinesiology and Public Health Education, University of North Dakota, Grand Forks, North Dakota, United States of America.
⁴ Department of Physiology, Institute of Sport - National Research Institute, Warsaw, Poland.
⁵ Department of Anatomy and Biomechanics, Kazimierz Wielki University, Bydgoszcz, Poland.

Abstract

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.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adolescent
Athletic Performance / physiology*
Cross-Sectional Studies
Exercise / physiology
Hockey / physiology*
Humans
Male
Muscle Strength / physiology
Physical Endurance / physiology
Physical Fitness / physiology
Vitamin D / analogs & derivatives*
Vitamin D / blood
Vitamin D Deficiency / blood
Vitamin D Deficiency / physiopathology

Substances

Vitamin D
25-hydroxyvitamin D

Grants and funding

This work was co-supported by the Fund for the Development of Physical Culture from the Ministry of Sport and Tourism, Republic of Poland (grant number 2016/0005/0223/SubB/DSW) and Institute of Sport – National Research Institute (grant number 102.05). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.