Dept. of Sport and Exercise Science, University of Auckland, Auckland, New Zealand.
Int J Sport Nutr Exerc Metab. 2010 Jun;20(3):191-7. doi: 10.1123/ijsnem.20.3.191.
Carbohydrate and caffeine are known to independently improve certain aspects of athletic performance. However, less is understood about physiological and performance outcomes when these compounds are coingested in a rehydration and carbohydrate-replacement strategy. The aim of this study was to examine the influence of adding a moderate dose of caffeine to a carbohydrate solution during prolonged soccer activity. Fifteen male soccer players performed two 90-min intermittent shuttle-running trials. They ingested a carbohydrate-electrolyte solution (CON) providing a total of 1.8 g/kg body mass (BM) of carbohydrate or a similar solution with added caffeine (CAF; 3.7 mg/kg BM). Solutions were ingested 1 hr before exercise and every 15 min during the protocol. Soccer passing skill and countermovement-jump height (CMJ) were quantified before exercise and regularly during exercise. Sprinting performance, heart rate, blood lactate concentration (La) and the subjective experiences of participants were measured routinely. Mean 15-m sprint time was faster during CAF (p = .04); over the final 15 min of exercise mean sprint times were CAF 2.48 +/- 0.15 s vs. CON 2.59 +/- 0.2 s. Explosive leg power (CMJ) was improved during CAF (52.9 +/- 5.8 vs. CON 51.7 +/- 5.7 cm, p = .03). Heart rate was elevated throughout CAF, and ratings of pleasure were significantly enhanced. There were no significant differences in passing skill, rating of perceived exertion, La, or body-mass losses between trials. The addition of caffeine to the carbohydrate-electrolyte solution improved sprinting performance, countermovement jumping, and the subjective experiences of players. Caffeine appeared to offset the fatigue-induced decline in self-selected components of performance.
碳水化合物和咖啡因已被证实能分别提高运动员在某些特定项目中的运动表现。然而，当这两种物质以某种特定的形式（如在补液和碳水化合物补充策略中）共同摄入时，其对生理和运动表现的影响还知之甚少。本研究旨在探讨在长时间足球运动中，向碳水化合物溶液中添加中等剂量咖啡因对运动员的影响。15 名男性足球运动员参与了两次 90 分钟的间歇性折返跑测试。他们摄入了碳水化合物电解质溶液（CON）或添加了咖啡因（CAF）的类似溶液，两种溶液的摄入量均为 1.8 g/kg 体重（BM）。溶液在运动前 1 小时和运动期间每 15 分钟摄入一次。在运动前和运动过程中定期测量足球传球技术和纵跳高度（CMJ）。冲刺性能、心率、血乳酸浓度（La）和参与者的主观感受也进行了常规测量。在 CAF 中，平均 15 米冲刺时间更快（p =.04）；在运动的最后 15 分钟，平均冲刺时间 CAF 为 2.48 +/- 0.15 秒，CON 为 2.59 +/- 0.2 秒。CAF 中腿部爆发力（CMJ）得到提高（52.9 +/- 5.8 vs. CON 51.7 +/- 5.7 cm，p =.03）。CAF 期间心率一直升高，愉悦感评分显著提高。两次试验之间传球技能、感觉努力程度、La 或体重损失没有显著差异。在碳水化合物电解质溶液中添加咖啡因可提高冲刺速度、纵跳高度和运动员的主观感受。咖啡因似乎可以抵消疲劳导致的自我选择性能的下降。
