Enhancement of 2000-m rowing performance after caffeine ingestion
Bruce CR, Anderson ME, Fraser SF, Stepto NK, Klein R, Hopkins WG, Hawley JA
Medicine and science in sports and exercise · 106 citas
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Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2000-11-01 · Med Sci Sports Exerc · vol. 32 · número 11 · págs. 1958–1963
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 217 citas · más que el 88% de estudios similares · 2.3× el promedio de su campo
- Referencias
- 33 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle metabolism and nutrition
- Palabras clave
- caffeine ingestion, rowing performance, endurance performance, ergogenic aids, plasma free fatty acids, respiratory exchange ratio
- MeSH
- humans, caffeine, fatty acids, nonesterified, cross-over studies, double-blind method, ergometry, physical endurance, sports, male
7 autores
- Clinton R. Bruce🇦🇺RMIT University
- MEGAN E. ANDERSON🇳🇿🇦🇺University of Otago; RMIT University
- Steve F. Fraser🇳🇿🇦🇺University of Otago; RMIT University
- Nigel K. Stepto🇳🇿🇦🇺University of Otago; RMIT University
- Rudi Klein🇳🇿🇦🇺University of Otago; RMIT University
- Will G. Hopkins🇳🇿🇦🇺University of Otago; RMIT University
- John Alan Hawley🇳🇿🇦🇺University of Otago; RMIT University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
To investigate the effect of caffeine ingestion on short-term endurance performance in competitive rowers.
Methods
In this randomized double-blind crossover study, eight competitive oarsmen (peak oxygen uptake [VO2peak] 4.7+/-0.4 L x 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 x kg(-1) body mass) or placebo. Trials were preceded by a standardized warm-up (6 min at 225+/-39 W; 75+/-7.7% VO2peak).
Results
Urinary caffeine concentration was similar before ingestion (approximately 1 mg x L(-1)) but rose to 6.2+/-3.6 and 14.5+/-7.0 mg x 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 x 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%).
Conclusions
Ingestion of 6 or 9 mg x kg(-1) of caffeine produces a worthwhile enhancement of short-term endurance performance in a controlled laboratory setting.
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