Effect of a moderate caffeine dose on endurance cycle performance and thermoregulation during prolonged exercise in the heat
Beaumont RE, James LJ
Journal of science and medicine in sport · 28 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
- 2017-03-31 · J Sci Med Sport · vol. 20 · número 11 · págs. 1024–1028
- Editorial
- Elsevier BV
- Citado
- 29 citas · más que el 81% de estudios similares · 1.5× el promedio de su campo
- Referencias
- 34 trabajos
- Acceso
- Acceso abierto (copia en repositorio) · CC-BY-NC-ND
- Áreas de investigación
- Thermoregulation and physiological responses · Coffee research and impacts · Sports Performance and Training
- Palabras clave
- caffeine supplementation, endurance cycling, thermoregulation, heat stress, prolonged exercise, core body temperature, perceived exertion, cortisol, prolactin, fat oxidation, carbohydrate oxidation, exercise performance
- MeSH
- humans, caffeine, hydrocortisone, prolactin, blood glucose, central nervous system stimulants, exercise test, exercise, case-control studies, cross-over studies, double-blind method, oxygen consumption, body temperature regulation, heart rate, exercise tolerance, bicycling, adult, male, athletic performance, hot temperature, young adult
2 autores
- Ross Eric Beaumont🇬🇧 · autor de correspondenciaLoughborough University
- Lewis John James🇬🇧Loughborough University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Objectives
This study investigated the influence of a moderate caffeine dose on endurance cycle performance and thermoregulation during prolonged exercise in high ambient temperature.
Design
Double-blind cross-over study.
Methods
Eight healthy, recreationally active males (mean±SD; age: 22±1 years; body mass: 71.1±8.5kg; VO2peak: 55.9±5.8mLkg-1min-1; Wmax: 318±37W) completed one VO2peak test, one familiarisation trial and two experimental trials. After an overnight fast, participants ingested a placebo or a 6mgkg-1 caffeine dose 60min before exercise. The exercise protocol consisted of 60min of cycle exercise at 55% Wmax, followed by a 30min performance task (total kJ produced) in 30°C and 50% RH.
Results
Performance was enhanced (Cohen's d effect size=0.22) in the caffeine trial (363.8±47.6kJ) compared with placebo (353.0±49.0kJ; p=0.004). Caffeine did not influence core (p=0.188) or skin temperature (p=0.577) during exercise. Circulating prolactin (p=0.572), cortisol (p=0.842) and the estimated rates of fat (p=0.722) and carbohydrate oxidation (p=0.454) were also similar between trial conditions. Caffeine attenuated perceived exertion during the initial 60min of exercise (p=0.033), with no difference in thermal stress across trials (p=0.911).
Conclusions
Supplementation with 6mgkg-1 caffeine improved endurance cycle performance in a warm environment, without differentially influencing thermoregulation during prolonged exercise at a fixed work-rate versus placebo. Therefore, moderate caffeine doses which typically enhance performance in temperate environmental conditions also appear to benefit endurance performance in the heat.
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