Physiological and cognitive responses to caffeine during repeated, high-intensity exercise
Physiological and cognitive responses to caffeine during repeated, high-intensity exercise
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DOI：
10.1123/ijsnem.16.5.528
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发表时间：
2006-10-01
影响因子：
2.5
通讯作者：
Spinks, Warwick L.
中科院分区：
文献类型：
--
作者：
Crowe, Melissa J.;Leicht, Anthony S.;Spinks, Warwick L.
本研究采用双盲、随机、交叉设计研究了咖啡因对重复无氧运动的影响。17名受试者（5名女性）在摄入咖啡因（6 mg/kg）、安慰剂或不摄入（对照）之前和之后进行认知（反应时间、数字回忆）和血液（葡萄糖、钾、儿茶酚胺、乳酸）测试。在咖啡因/安慰剂消耗后90分钟进行运动试验（两次60 s最大自行车比赛）。血浆咖啡因浓度显着增加后，咖啡因摄入，但是，有没有积极的影响，认知或血液参数，除了在休息时血浆钾浓度显着下降。与对照组相比，咖啡因的潜在负面影响包括血乳酸显着升高，与对照组和安慰剂相比，运动第2回合达到峰值功率的时间显着减慢。咖啡因对峰值功率、工作输出、RPE或峰值心率没有显著影响。总之，咖啡因对重复的、最大的自行车比赛没有致能作用，并且可能对无氧性能有害。
This study investigated the effects of caffeine on repeated, anaerobic exercise using a double-blind, randomized, crossover design. Seventeen subjects (five female) underwent cognitive (reaction time, number recall) and blood (glucose, potassium, catecholamines, lactate) testing before and after consuming caffeine (6 mg/kg), placebo, or nothing (control). An exercise test (two 60 s maximal cycling bouts) was conducted 90 min after caffeine/placebo consumption. Plasma caffeine concentrations significantly increased after caffeine ingestion, however, there were no positive effects on cognitive or blood parameters except a significant decrease in plasma potassium concentrations at rest. Potentially negative effects of caffeine included significantly higher blood lactate compared to control and significantly slower time to peak power in exercise bout 2 compared to control and placebo. Caffeine had no significant effect on peak power, work output, RPE, or peak heart rate. In conclusion, caffeine had no ergogenic effect on repeated, maximal cycling bouts and may be detrimental to anaerobic performance.