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首页> 外文期刊>International journal of sport nutrition and exercise metabolism >Vitamin D Supplementation and Physical Performance in Adolescent Swimmers
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Vitamin D Supplementation and Physical Performance in Adolescent Swimmers

机译：青少年游泳者补充维生素D和体能表现

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It is hypothesized that vitamin D insufficiency in athletes might negatively affect sport performance. The objective of this study was to examine the effect of vitamin D-3 supplementation on physical performance of adolescent swimmers with vitamin D insufficiency. Fifty-three adolescent competitive swimmers with vitamin D insufficiency (serum 25-hydroxyvitamin-D concentrations (25(OH)D)<30ng/ml, mean 24.2 +/- 4.8ng/ml) were randomized to receive 2,000IU/day of vitamin D-3 or placebo for 12 weeks. Swimming performance at several speeds, arm-grip strength, and one-legged balance, were measured before and after supplementation. The age-adjusted changes in performance variables during the study were compared between groups. 25(OH) D concentrations at study end were significantly higher in the vitamin group compared with the placebo group (29.6 +/- 6.5ng/ml vs. 20.3 +/- 4.2ng/ml, p < .001), yet only 48% of the vitamin group became vitamin D sufficient with this dosing. No between-group differences were found in the changes of the performance variables tested. No significant differences in performance were found between participants that became vitamin D sufficient, and those who did not. No significant correlation was found between the change in serum 25(OH)D and age-adjusted balance, strength or swimming performance at study end. Vitamin D-3 supplementation that raised serum 25(OH)D concentrations by a mean of 9.3ng/ml above placebo in adolescent swimmers with vitamin D insufficiency, did not improve physical performance more than placebo.
机译：据推测，运动员体内维生素D不足可能会对运动表现产生负面影响。这项研究的目的是研究补充维生素D-3对维生素D功能不足的青少年游泳者身体机能的影响。 53名维生素D功能不全的青少年竞技游泳者（血清25-羟基维生素D浓度（25（OH）D）<30ng / ml，平均24.2 +/- 4.8ng / ml）被随机分配为接受2,000IU /天的维生素D-3或安慰剂治疗12周。在补充之前和之后测量几种速度下的游泳表现，手臂握力和单腿平衡。在研究期间比较了年龄调整后的性能变量变化。与安慰剂组相比，维生素组在研究结束时的25（OH）D浓度显着更高（29.6 +/- 6.5ng / ml与20.3 +/- 4.2ng / ml，p <.001），但只有48通过该剂量，维生素组的％变为足够的维生素D。在测试的性能变量的变化中未发现组间差异。在足够补充维生素D的参与者和没有补充维生素D的参与者之间，没有发现表现上的显着差异。在研究结束时，血清25（OH）D的变化与年龄调整后的平衡，力量或游泳成绩之间无显着相关性。在维生素D功能不全的青少年游泳运动员中，补充维生素D-3可使血清25（OH）D浓度比安慰剂平均提高9.3ng / ml，但与安慰剂相比，其身体机能的改善并不明显。

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