Effect of a moderate caffeine dose on endurance cycle performance and thermoregulation during prolonged exercise in the heat.
J Sci Med Sport
; 20(11): 1024-1028, 2017 Nov.
Article
em En
| MEDLINE
| ID: mdl-28420550
ABSTRACT
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.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Regulação da Temperatura Corporal
/
Cafeína
/
Tolerância ao Exercício
/
Desempenho Atlético
/
Estimulantes do Sistema Nervoso Central
Tipo de estudo:
Clinical_trials
/
Observational_studies
Limite:
Adult
/
Humans
/
Male
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article