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J Sci Med Sport. 2017 Nov;20(11):1024-1028. doi: 10.1016/j.jsams.2017.03.017. Epub 2017 Mar 31.

Effect of a moderate caffeine dose on endurance cycle performance and thermoregulation during prolonged exercise in the heat.

Author information

1
School of Sport, Exercise and Health Sciences, Loughborough University, UK. Electronic address: r.e.beaumont@lboro.ac.uk.
2
School of Sport, Exercise and Health Sciences, Loughborough University, UK.

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.

KEYWORDS:

Core temperature; Exercise; Fatigue; Stimulants; Substrate oxidation; Supplements

PMID:
28420550
DOI:
10.1016/j.jsams.2017.03.017
[Indexed for MEDLINE]

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