期刊
JOURNAL OF SPORTS SCIENCES
卷 24, 期 4, 页码 433-439出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02640410500231496
关键词
ergogenic aids; caffeine; endurance performance; field setting
The aim of this study was to assess the effect of caffeine ingestion on 8 km run performance using an ecologically valid test protocol. A randomized double-blind crossover study was conducted involving eight male distance runners. The participants ran an 8 km race 1 h after ingesting a placebo capsule, a caffeine capsule (3 mg . kg(-1) body mass) or no supplement. Heart rate was recorded at 5 s intervals throughout the race. Blood lactate concentration and ratings of perceived exertion were recorded after exercise. A repeated-measures analysis of variance ( ANOVA) identified a significant treatment effect for 8 km performance time (P<0.05); caffeine resulted in a mean improvement of 23.8 s (95% confidence interval [CI] 13.1 to 34.5 s) in 8 km performance time (1.2% improvement, 95% CI 0.7 to 1.8%). In addition, a two-way (time x condition) repeated-measures ANOVA identified a significantly higher blood lactate concentration 3 min after exercise during the caffeine trial ( P<0.05). We conclude that ingestion of 3 mg . kg(-1) body mass of caffeine can improve absolute 8 km run performance in an ecologically valid race setting.
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