This study investigated the effect of acute bouts of high-intensity aerobic exercise of differing durations on subjective appetite, food intake and appetite-associated hormones in endurance-trained males. Twelve endurance-trained males (age=21±2 years; BMI=21.0±1.6 kg•m-2; VO2max=61.6±6.0 mL• kg-1• min-1) completed four trials, within a maximum 28-day period, in a counterbalanced order: resting (REST); 15-minutes exercise bout (15-MIN); 30-minute exercise bout (30-MIN) and 45-minute exercise bout (45-MIN). All exercise was completed on a cycle ergometer at an intensity of ~76% VO2max. Sixty minutes post-exercise, participants consumed an ad libitum meal. Measures of subjective appetite and blood samples were obtained throughout the morning, with plasma analysed for acylated ghrelin, total polypeptide tyrosine-tyrosine (PYY) and total glucagon-like peptide 1 (GLP-1) concentrations. We found that neither subjective appetite nor absolute food intake differed between trials. Relative energy intake (intake - expenditure) was significantly greater after REST (2641±1616 kJ) compared with both 30-MIN (1039±1520 kJ) and 45-MIN (260±1731 kJ), and significantly greater after 15-MIN (2699±1239 kJ) compared with 45-MIN (condition main effect, p<0.001). GLP-1 concentration increased immediately post-exercise in 30-MIN and 45-MIN, respectively (condition-x-time interaction, p<0.001). Acylated ghrelin was transiently suppressed in all exercise trials (condition-x-time interaction, p=0.011); the greatest, most enduring suppression was observed in 45-MIN. PYY concentration was unchanged with exercise. High-intensity aerobic cycling lasting up to 45 minutes did not suppress subjective appetite or affect absolute food intake, but did reduce relative energy intake, in well-trained endurance athletes. Findings question the role of appetite hormones in regulating subjective appetite in the acute post-exercise period.
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