UNASSIGNED: The study was conducted using a randomized, crossover, and counterbalanced design, with a beverage containing guarana or placebo administered in a double-blind manner. Twenty-seven under-17 soccer players of a professional soccer club performed a battery of tests 60 min after the ingestion of guarana (3 g of the fruit seed powder) or placebo. Trials were performed with a 7-day washout period. The battery of tests included a countermovement jump test, sprints of 10 and 20 m, an Illinois agility test, and a Yo-Yo Intermittent Recovery Test level 1 (YYIR1).
UNASSIGNED: Guarana ingestion did not improve countermovement jump, sprints, or agility (p > 0.05). However, guarana ingestion increased the distance covered in the YYIR1, compared with placebo ingestion (p = 0.01).
UNASSIGNED: Acute ingestion of guarana improves the capacity to perform intermittent exercise in soccer players but seems to be ineffective to improve lower limb power, sprint, and agility.
■这项研究是使用随机,交叉,和平衡设计,以双盲方式服用含有瓜拉那或安慰剂的饮料。在摄入瓜拉那(3克水果种子粉)或安慰剂后60分钟,职业足球俱乐部的27名17岁以下足球运动员进行了一系列测试。进行试验的时间为7天。一系列测试包括反运动跳跃测试,10米和20米的冲刺,伊利诺伊州的敏捷性测试,和Yo-Yo间歇恢复测试1级(YYIR1)。
■瓜拉那摄入并没有改善反动跳跃,冲刺,或敏捷性(p>0.05)。然而,与安慰剂摄入相比,瓜拉那摄入增加了YYIR1覆盖的距离(p=0.01)。
■急性摄入瓜拉那提高了足球运动员进行间歇性锻炼的能力,但似乎对提高下肢力量无效,sprint,和敏捷性。