Journal
INTERNATIONAL JOURNAL OF SPORT NUTRITION AND EXERCISE METABOLISM
Volume 10, Issue 4, Pages 464-475Publisher
HUMAN KINETICS PUBL INC
DOI: 10.1123/ijsnem.10.4.464
Keywords
ergogenic; ergometer; dose-response
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Eight competitive oarswomen (age, 22 +/- 3 years; mass, 64.4 +/- 3.8 kg) performed three simulated 2,000-m time trials on a rowing ergometer. The trials, which were preceded by a 24-hour dietary and training control and 72 hours of caffeine abstinence, were conducted 1 hour after ingesting caffeine (6 or 9 mg.kg(-1) body mass) or placebo. Plasma free fatty acid concentrations before exercise were higher with caffeine than placebo (0.67 +/- 0.34 vs. 0.72 +/- 0.36 vs. 0.30 +/- 0.10 mM for 6 and 9 mg.kg(-1) caffeine and placebo,respectively; p<.05). Performance time improved 0.7% (95% confidence interval [CI] 0 to 1.5%) with 6 mg.kg(-1) caffeine and 1.3% (95% CI 0.5 to 2.0%) with 9 mg.kg(-1) caffeine. The first 500 m of the 2,000 m was faster with the higher caffeine dose compared with placebo or the lower dose (1.53 +/- 0.52 vs. 1.55 +/- 0.62 and 1.56 +/- 0.43 min; p=.02). We concluded that caffeine produces a worthwhile enhancement of performance in a controlled laboratory setting, primarily by improving the first 500 m of a 2,000-m row.
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