Multiple effects of caffeine on simulated high-intensity team-sport performance
Stuart GR, Hopkins WG, Cook C, Cairns SP
Medicine and science in sports and exercise · 121 citas
Etiquetas de revisión
Financiación no declaradaDatos neutrales que nuestra revisión registró sobre cómo se hizo este estudio. Describen el método, nunca si nos gusta el resultado.
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
- 2005-11-01 · Med Sci Sports Exerc · vol. 37 · número 11 · págs. 1998–2005
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 219 citas · más que el 92% de estudios similares · 3.4× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 32 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Thermoregulation and physiological responses
- Palabras clave
- caffeine, team sports performance, rugby union, high-intensity exercise, repeated bouts, sprint performance, agility, passing accuracy, epinephrine, fatigue, interstitial fluid
- MeSH
- humans, fatigue, epinephrine, caffeine, central nervous system stimulants, placebos, cross-over studies, double-blind method, task performance and analysis, running, football, physical fitness, adult, male
4 autores
- GENE R. STUART🇳🇿Auckland University of Technology
- Will G. Hopkins🇳🇿Auckland University of Technology
- Christian John Cook
- Simeon P. Cairns🇳🇿Auckland University of Technology
Resumen
El texto original del estudio, en el idioma en que se publicó.
Introduction
Caffeine enhances performance of single bouts of endurance exercise, but its effects on repeated bouts typical of those in high-intensity team sports are unclear.
Purpose
To investigate effects of caffeine in a performance test simulating physical and skill demands of a rugby union game.
Methods
The study was a double-blind, randomized, crossover design in which nine competitive male rugby players ingested either caffeine (6 mg.kg(-1) body mass) or placebo (dextrose) 70 min before performing a rugby test. Each test consisted of seven circuits in each of two 40-min halves with a 10-min half-time rest. Each circuit included stations for measurement of sprint time (two straight-line and three agility sprints), power generation in two consecutive drives, and accuracy for passing balls rapidly. Interstitial fluid was sampled transdermally by electrosonophoresis before ingestion of caffeine or placebo and then before testing, at half-time, and immediately after testing; samples were assayed chromatographically for caffeine and epinephrine concentrations.
Results
The effects of caffeine on mean performance (+/-90% confidence limits) over all 14 circuits were: sprint speeds, 0.5% (+/-1.7%) through 2.9% (+/-1.3%); first-drive power, 5.0% (+/-2.5%); second-drive power, -1.2% (+/-6.8%); and passing accuracy, 9.6% (+/-6.1%). The enhancements were mediated partly through a reduction of fatigue that developed throughout the test and partly by enhanced performance for some measures from the first circuit. Caffeine produced a 51% (+/-11%) increase in mean epinephrine concentration; correlations between individual changes in epinephrine concentration and changes in performance were mostly unclear, but there were some strong positive correlations with sprint speeds and a strong negative correlation with passing accuracy.
Conclusion
Caffeine is likely to produce substantial enhancement of several aspects of high-intensity team-sport performance.
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