Alimoradi Karamollah, Nikooyeh Bahareh, Ravasi Ali Asghar, Zahedirad Maliheh, Shariatzadeh Nastaran, Kalayi Ali, Neyestani Tirang Reza
Department of Nutrition Research, Faculty of Nutrition Science and Food Technology, Shahid Beheshti University of Medical Science, Tehran, Iran.
Department of Nutrition Research, Laboratory of Nutrition Research, National Nutrition and Food Technology Research Institute and Faculty of Nutrition Science and Food Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Int J Prev Med. 2019 Jun 7;10:100. doi: 10.4103/ijpvm.IJPVM_227_18. eCollection 2019.
There has been no report of the vitamin D status of the professional athletes from Iran to date. This study was performed to evaluate the efficacy of weekly vitamin D supplementation on athletic performance in Iranian athletes expedited to Asian competition in Taipei, China, 2015.
This study was a randomized controlled clinical trial. Seventy subjects were enrolled in the study. The athletes were randomly divided into two groups: vitamin D supplement (D; received 50,000 IU of vitamin D supplement weekly) and control (P, received a placebo weekly). Duration of the study was 8 weeks. Anthropometric, dietary, athletic performance, and biochemical evaluations were performed for all subjects in the beginning and in the end of the intervention period.
A significant rise in circulating 25(OH)D concentration was observed in D group (17.3 ± 16.9 ng/mL, < 0.001), whereas in group, there was a statistically significant decrement (-3.1 ± 8.4 ng/mL, = 0.040). There were no either within- or between-group significant differences in Ergo jump, vertical jump, and agility tests. In strength leg press tests, both groups showed a significant improvement. However, comparisons of changes revealed that the improvement in D group was significantly higher than in group ( = 0.034). Moreover, in sprint test (one repetition-Max, 1RM), only D group had a significant within-group improvement ( = 0.030).
Weekly supplementation with 50,000 IU vitamin D resulted in nearly 17 ng/mL increment in circulating calcidiol. This increase was associated with significant improvement of power leg press and sprint tests in D-supplemented group.
迄今为止，尚无关于伊朗职业运动员维生素D状况的报告。本研究旨在评估2015年在中国台北参加亚洲比赛的伊朗运动员每周补充维生素D对运动表现的影响。
本研究为随机对照临床试验。70名受试者参与了该研究。运动员被随机分为两组：维生素D补充组（D组，每周接受50,000 IU维生素D补充剂）和对照组（P组，每周接受安慰剂）。研究持续时间为8周。在干预期开始和结束时，对所有受试者进行人体测量、饮食、运动表现和生化评估。
D组循环25(OH)D浓度显著升高（17.3±16.9 ng/mL，P<0.001），而P组有统计学意义的下降（-3.1±8.4 ng/mL，P = 0.040）。在功率跳跃、垂直跳跃和敏捷性测试中，组内和组间均无显著差异。在腿部力量测试中，两组均有显著改善。然而，变化比较显示，D组的改善显著高于P组（P = 0.034）。此外，在短跑测试（一次重复最大值，1RM）中，只有D组有显著的组内改善（P = 0.030）。
每周补充50,000 IU维生素D可使循环骨化二醇增加近17 ng/mL。这种增加与补充维生素D组的腿部力量和短跑测试的显著改善有关。
