Department of Pediatrics, Diabetology and Endocrinology, University Clinical Centre in Gdansk, 80-210 Gdansk, Poland.
Laboratory of Exercise Testing, Hellenic Air Force Academy, 13671 Dekelia, Greece.
Nutrients. 2019 Feb 6;11(2):349. doi: 10.3390/nu11020349.
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.
本研究旨在证实，在 8 周高强度训练期间为年轻足球运动员补充维生素 D 会对他们的运动活动产生显著影响。受试者分为两组：实验组（SG，n=20）补充维生素 D，安慰剂组（PG，n=16）不补充维生素 D。所有运动员都接受了相同的足球训练，即高强度间歇训练（HIIT）。在干预前后收集了维生素 D 状态、时间运动参数和心率数据。补充组的 25(OH)D 浓度显著增加（119%），而未补充组则下降 8.4%。根据所得结果，发现运动员在实验最后阶段的小型比赛中，其身体活动指标明显提高。然而，考虑到维生素 D 补充的效果，安慰剂组和补充组之间没有统计学上的显著差异；因此，进行的实验的效应量很小。
