Can Supplementation of Vitamin D Improve Aerobic Capacity in Well Trained Youth Soccer Players?

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Maria Jastrzebska, Mariusz Kaczmarczyk, Malgorzata Michalczyk, Lukasz Radziminski, Piotr Stepien, Joanna Jastrzebska, Dorota Wakuluk, Arturo Diaz Suarez, Guillermo Felipe Lopez Sanchez, Pawel Cieszczyk, Piotr Godlewski, Pawel Krol, Zbigniew Jastrzebski

There is no clear evidence that vitamin D effectively improves physical capacity in high-level athletes. The aim of this study was to confirm that vitamin D supplementation of soccer players during eight-week high-intensity training would have a significant effect on their aerobic capacity. The subjects were divided into two groups: the experimental one that was supplemented with vitamin D (SG, n = 20), and the placebo group (PG, n = 16), 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 level, PWC170, lactate threshold (LT) were collected just before and after the intervention. A significant increase in vitamin D concentration (119%) was observed in the supplemented group, while the non-supplemented group showed a decrease of 8.4%. The studied subjects improved VO2max results by 20% in the SG, and by 13% in the PG. The improvement in velocity at the LT was similar in both groups. Results of this study show that vitamin D can have a positive, though moderate, effect on aerobic performance in players subjected to high-intensity training in the form of small-sided games for 8 weeks.
DOI: 10.2478/hukin-2018-0033
Key words
soccer, training load, nutrition, youth athletes

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