Enhancement of 2000-m rowing performance after caffeine ingestion


    loading  Checking for direct PDF access through Ovid

Abstract

BRUCE, C. R., M. E. ANDERSON, S. F. FRASER, N. K. STEPTO, R. KLEIN, W. G. HOPKINS, and J. A. HAWLEY. Enhancement of 2000-m rowing performance after caffeine ingestion. Med. Sci. Sports Exerc., Vol. 32, No. 11, pp. 1958–1963, 2000.PurposeTo investigate the effect of caffeine ingestion on short-term endurance performance in competitive rowers.MethodsIn this randomized double-blind crossover study, eight competitive oarsmen (peak oxygen uptake [V̇O2peak] 4.7 ± 0.4 L·min−1, mean ± SD) performed three familiarization trials of a 2000-m rowing test on an air-braked ergometer, followed by three experimental trials at 3- to 7-d intervals, each 1 h after ingesting caffeine (6 or 9 mg·kg−1 body mass) or placebo. Trials were preceded by a standardized warm-up (6 min at 225 ± 39 W; 75 ± 7.7% V̇O2peak).ResultsUrinary caffeine concentration was similar before ingestion (∼1 mg·L−1) but rose to 6.2 ± 3.6 and 14.5 ± 7.0 mg·L−1 for the low and high caffeine doses, respectively. Plasma free fatty acid concentration before exercise was higher after caffeine ingestion (0.29 ± 0.17 and 0.39 ± 0.20 mM for 6 and 9 mg·kg−1, respectively) than after placebo (0.13 ± 0.05 mM). Respiratory exchange ratio during the warm-up was also substantially lower with caffeine (0.94 ± 0.09 and 0.93 ± 0.06 for the low and high dose) than with placebo (0.98 ± 0.12). Subjects could not distinguish between treatments before or after the exercise test. Both doses of caffeine had a similar ergogenic effect relative to placebo: performance time decreased by a mean of 1.2% (95% likely range 0.4–1.9%); the corresponding increase in mean power was 2.7% (0.4–5.0%). Performance time showed some evidence of individual differences in the effect of caffeine (SD 0.9%; 95% likely range 1.5 to −0.9%).ConclusionsIngestion of 6 or 9 mg·kg−1 of caffeine produces a worthwhile enhancement of short-term endurance performance in a controlled laboratory setting.

    loading  Loading Related Articles