Abstract：
UNASSIGNED: To investigate the acute effects of ingesting a beverage containing guarana (Paullinia cupana) seed powder on performance during field tests related to physical capacities that are determinants of soccer performance, such as lower limb power, sprint, agility, and the capacity to carry out intermittent exercise.
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.
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.
摘要：
■为了研究摄入含有瓜拉那（Paulliniacupana）种子粉的饮料对表现的急性影响，在与足球表现的决定因素的身体能力相关的现场测试中，比如下肢力量，sprint,敏捷性,以及进行间歇锻炼的能力。
■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。
■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。
