Vitamin D Supplementation and Physical Activity of Young Soccer Players during High-Intensity Training.

Maria Skalska, Pantelis Theo Nikolaidis, Beat Knechtle, Thomas Johannes Rosemann, Łukasz Radzimiński, Joanna Jastrzębska, Mariusz Kaczmarczyk, Artur Myśliwiec, Paul Dragos, Guillermo F López-Sánchez, Zbigniew Jastrzębski

Journal: Nutrients 2019;11(2):349

PMID: 30736376

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Plain Language Summary

It has been shown that the vitamin D levels in athletes has a significant impact on their neuro-muscular system. The aim of this study was to determine the effect of vitamin D supplementation on physical activity measures among soccer players during small-sided games after an 8-week high-intensity training programme. In this placebo-controlled, double blind study, 36 participants were randomised to receive either placebo or vitamin D (5000 IU) supplementation for 8 weeks. Average distance and intensity was calculated based on four small-sided games. While the supplemented group increased vitamin D levels significantly, improvements in various physical activity measures were not statistically significant. Though the effect size of this trial is low the authors recommend supplementing vitamin D to young soccer players, especially with vitamin D levels are deficient.

Abstract

The aim of this study was to confirm that vitamin D supplementation of young soccer players during eight-week high-intensity training would have a significant effect on their motion activity. The subjects were divided into two groups: the experimental one, which was supplemented with vitamin D (SG, = 20), and the placebo group (PG, = 16), which was not supplemented with vitamin D. All the players were subjected to the same soccer training, described as High-Intensity Interval Training (HIIT). The data of the vitamin D status, time motion parameters and heart rate were collected just before and after the intervention. A significant increase in 25(OH)D concentration (119%) was observed in the supplemented group, while the non-supplemented group showed a decrease of 8.4%. Based on the obtained results, it was found that physical activity indicators in the players were significantly improved during small-sided games at the last stage of the experiment. However, taking into account the effect of supplementation with vitamin D, there were no statistically significant differences between the placebo and the supplemented groups; thus, the effect size of the conducted experiment was trivial.

Address: Department of Pediatrics, Diabetology and Endocrinology, University Clinical Centre in Gdansk, 80-210 Gdansk, Poland. [email protected].; Laboratory of Exercise Testing, Hellenic Air Force Academy, 13671 Dekelia, Greece. [email protected].; Institute of General Practice and for Health Services Research, University of Zurich, 8091 Zurich, Switzerland. [email protected].; Institute of General Practice and for Health Services Research, University of Zurich, 8091 Zurich, Switzerland. [email protected].; Department of Health Promotion, Gdansk University of Physical Education and Sport, 80-336 Gdańsk, Poland. [email protected].; Department of Pediatrics, Diabetology and Endocrinology, Gdansk Medical University, 80-210 Gdansk, Poland. [email protected].; Department of Health Promotion, Gdansk University of Physical Education and Sport, 80-336 Gdańsk, Poland. [email protected].; Department of Health Promotion, Gdansk University of Physical Education and Sport, 80-336 Gdańsk, Poland. [email protected].; Department of Physical Education, Sport and Physical Therapy, University of Oradea, 410087 Oradea, Romania. [email protected].; Faculty of Sport Sciences, University of Murcia, 30720 Murcia, Spain. [email protected].; Department of Health Promotion, Gdansk University of Physical Education and Sport, 80-336 Gdańsk, Poland. [email protected].

DOI: 10.3390/nu11020349

Patient Centred Factor

Mediators: Vitamin D

Clinical Imbalances

Neurological Structural Integrity and Musculoskeletal

Laboratory Testing

Blood

Modifiable Lifestyle Factors

Exercise and movement

Jadad Score

Nutrition Evidence Keywords

HIIT

Bioactive Substances

25(OH)D

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MeSH Terms: Adolescent, Dietary Supplements, Double-Blind Method, Exercise, Female, Heart Rate, High-Intensity Interval Training, Humans, Male, Soccer, Time and Motion Studies, Vitamin D, Vitamins