No effect of caffeine on exercise performance in high ambient temperature
Roelands B, Buyse L, Pauwels F, Delbeke F, Deventer K, Meeusen R
European journal of applied physiology · 43 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
- 2011-04-01 · Eur J Appl Physiol · vol. 111 · número 12 · págs. 3089–3095
- Editorial
- Springer Science+Business Media
- Citado
- 70 citas · más que el 90% de estudios similares · 2.9× el promedio de su campo
- Referencias
- 51 trabajos
- Acceso
- De pago
- Áreas de investigación
- Thermoregulation and physiological responses · Coffee research and impacts · Sports Performance and Training
- Palabras clave
- caffeine, exercise performance, heat stress, thermoregulation, core body temperature, beta-endorphin, ergogenic aids, cyclists, adenosine receptor antagonism, dopamine signaling
- MeSH
- humans, caffeine, beta-endorphin, body temperature, exercise, cross-over studies, double-blind method, body temperature regulation, heart rate, bicycling, adult, male, hot temperature, young adult
6 autores
- Bart Roelands🇧🇪Vrije Universiteit Brussel
- Luk Buyse🇧🇪Vrije Universiteit Brussel
- Frank Pauwels🇧🇪Vrije Universiteit Brussel
- Frans T. Delbeke🇧🇪Ghent University
- Koen Deventer🇧🇪Ghent University
- ROMAIN R. MEEUSEN🇧🇪 · autor de correspondenciaVrije Universiteit Brussel
Resumen
El texto original del estudio, en el idioma en que se publicó.
Caffeine, an adenosine receptor antagonist, has shown to improve performance in normal ambient temperature, presumably via an effect on dopaminergic neurotransmission through the antagonism of adenosine receptors. However, there is very limited evidence from studies that administered caffeine and examined its effects on exercise in the heat. Therefore, we wanted to study the effects of caffeine on performance and thermoregulation in high ambient temperature. Eight healthy trained male cyclists completed two experimental trials (in 30°C) in a double-blind-randomized crossover design. Subjects ingested either placebo (6 mg/kg) or caffeine (6 mg/kg) 1 h prior to exercise. Subjects cycled for 60 min at 55% W (max), immediately followed by a time trial to measure performance. The significance level was set at p < 0.05. Caffeine did not change performance (p = 0.462). Rectal temperature was significantly elevated after caffeine administration (p < 0.036). Caffeine significantly increased B-endorphin plasma concentrations at the end of the time trial (p = 0.032). The present study showed no ergogenic effect of caffeine when administered 1 h before exercise in 30°C. This confirms results from a previous study that examined the effects of caffeine administration on a short (15 min) time trial in 40°C. However, caffeine increased core temperature during exercise. Presumably, the rate of increase in core temperature may have counteracted the ergogenic effects of caffeine. However, other factors such as interindividual differences in response to caffeine and changes in neurotransmitter concentrations might also be responsible for the lack of performance improvement of caffeine in high ambient temperature.
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