School of Physical Education and Sport - Laboratory of Biomechanics, University of Sao Paulo, Av Mello de Moraes, 65, Sao Paulo, SP 05508-030, Brazil.
Department of Health and Performance, Red Bull Brazil Football, João Lúcio do Prado street, Km 10, Jarinu, SP 13240-000, Brazil.
J Int Soc Sports Nutr. 2014 Jun 18;11:32. doi: 10.1186/1550-2783-11-32. eCollection 2014.
Studies involving chronic creatine supplementation in elite soccer players are scarce. Therefore, the aim of this study was to examine the effects of creatine monohydrate supplementation on lower-limb muscle power in Brazilian elite soccer players (n = 14 males) during pre-season training.
This was a randomized, double-blind, placebo-controlled parallel-group study. Brazilian professional elite soccer players participated in this study. During the pre-season (7 weeks), all the subjects underwent a standardized physical and specific soccer training. Prior to and after either creatine monohydrate or placebo supplementation, the lower-limb muscle power was measured by countermovement jump performance. The Jumping performance was compared between groups at baseline (p = 0.99). After the intervention, jumping performance was lower in the placebo group (percent change = - 0.7%; ES = - 0.3) than in the creatine group (percent change = + 2.4%; ES = + 0.1), but it did not reach statistical significance (p = 0.23 for time x group interaction). Fisher's exact test revealed that the proportion of subjects that experienced a reduction in jumping performance was significantly greater in the placebo group than in the creatine group (5 and 1, respectively; p = 0.05) after the training. The magnitude-based inferences demonstrated that placebo resulted in a possible negative effect (50%) in jumping performance, whereas creatine supplementation led to a very likely trivial effect (96%) in jumping performance in the creatine group.
Creatine monohydrate supplementation prevented the decrement in lower-limb muscle power in elite soccer players during a pre-season progressive training.
涉及精英足球运动员长期补充肌酸的研究很少。因此，本研究旨在检查肌酸一水合物补充剂对巴西精英足球运动员（n = 14 名男性）在赛季前训练期间下肢肌肉力量的影响。
这是一项随机、双盲、安慰剂对照的平行组研究。巴西职业精英足球运动员参加了这项研究。在赛季前（7 周），所有受试者都接受了标准化的体能和专项足球训练。在补充肌酸一水合物或安慰剂之前和之后，通过反跳式跳跃表现来测量下肢肌肉力量。在基线时比较两组的跳跃表现（p = 0.99）。干预后，安慰剂组的跳跃性能下降（百分比变化=-0.7%；ES=-0.3），而肌酸组的跳跃性能上升（百分比变化=+2.4%；ES=+0.1），但差异无统计学意义（时间×组间交互作用的 p = 0.23）。Fisher 确切检验显示，与肌酸组相比，安慰剂组中经历跳跃性能下降的受试者比例显著更高（分别为 5 和 1；p = 0.05）。基于效应量的推断表明，安慰剂可能对跳跃性能产生负面影响（50%），而肌酸补充剂可能对肌酸组的跳跃性能产生非常微小的影响（96%）。
肌酸一水合物补充剂可防止精英足球运动员在赛季前渐进训练中下肢肌肉力量下降。
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