Dose effect of caffeine on testosterone and cortisol responses to resistance exercise
Beaven CM, Hopkins WG, Hansen KT, Wood MR, Cronin JB, Lowe TE
International journal of sport nutrition and exercise metabolism · 36 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
- 2008-04-01 · Int J Sport Nutr Exerc Metab · vol. 18 · número 2 · págs. 131–141
- Editorial
- Human Kinetics
- Citado
- 70 citas · más que el 85% de estudios similares · 2.1× el promedio de su campo
- Referencias
- 38 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Exercise and Physiological Responses
- Palabras clave
- caffeine, testosterone, cortisol, resistance training, dose-response relationship, testosterone/cortisol ratio, ergogenic aids, rugby league players, acute exercise response
- MeSH
- saliva, humans, caffeine, testosterone, hydrocortisone, central nervous system stimulants, cross-over studies, double-blind method, task performance and analysis, dose-response relationship, drug, weight lifting, adult, male
6 autores
- C. Martyn Beaven
- Will G. Hopkins
- Keir T. Hansen
- Matthew R. Wood
- John Barry Cronin
- Timothy E. Lowe
Resumen
El texto original del estudio, en el idioma en que se publicó.
Introduction
Interest in the use of caffeine as an ergogenic aid has increased since the International Olympic Committee lifted the partial ban on its use. Caffeine has beneficial effects on various aspects of athletic performance, but its effects on training have been neglected.
Purpose
To investigate the acute effect of caffeine on the exercise-associated increases in testosterone and cortisol in a double-blind crossover study.
Methods
Twenty-four professional rugby-league players ingested caffeine doses of 0, 200, 400, and 800 mg in random order 1 hr before a resistance-exercise session. Saliva was sampled at the time of caffeine ingestion, at 15-min intervals throughout each session, and 15 and 30 min after the session. Data were log-transformed to estimate percent effects with mixed modeling, and effects were standardized to assess magnitudes.
Results
Testosterone concentration showed a small increase of 15% (90% confidence limits, +/- 19%) during exercise. Caffeine raised this concentration in a dose-dependent manner by a further small 21% (+/- 24%) at the highest dose. The 800-mg dose also produced a moderate 52% (+/- 44%) increase in cortisol. The effect of caffeine on the testosterone:cortisol ratio was a small decline (14%; +/- 21%).
Conclusion
Caffeine has some potential to benefit training outcomes via the anabolic effects of the increase in testosterone concentration, but this benefit might be counteracted by the opposing catabolic effects of the increase in cortisol and resultant decline in the testosterone:cortisol ratio.
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