Abstract
This study investigated the acute circulating gut hormone, appetite and gastric emptying rate responses to a semi-solid meal following exercise at different intensities. Twelve men completed three trials in a randomised-crossover design, consisting of continuous cycling at 70% O2Peak (HIGH), 40% O2Peak (LOW) or rest (CONTROL). Baseline samples were collected after an overnight fast before undertaking the 60 min exercise or rest period, followed by 30 min rest before consumption of a standardised semi-solid meal (~242 kcal). During the 2 h postprandial period, gastric emptying rate of the meal was examined using the 13C-breath test method, appetite was measured using visual analogue scales, and serum concentrations of acylated ghrelin, pancreatic polypeptide, peptide YY, glucagon-like peptide-1, insulin, glucose, triglycerides, total cholesterol and non-esterified fatty acids were assessed. Subjective appetite response was not different between trials (p > 0.05). Half emptying time of the meal was 89 ± 13, 82 ± 8 and 94 ± 31 min on CONTROL, LOW and HIGH, respectively (p = 0.247). In healthy un-trained adult males, responses to exercise at intensities of 70% and 40% O2Peak did not differ to a non-exercise control for measurements of subsequent gastric emptying, circulating gut hormone response or appetite. These results suggest that exercise intensity has little effect on post-exercise appetite response to a semi-solid meal.
Highlights
As the prevalence of obesity increases, caused by a chronic energy excess, investigations have focused on reducing energy intake and/or increasing exercise energy expenditure as an effective weight loss strategy
Average heart rate was significantly higher during the HIGH trial than LOW and CONTROL
This suggests gastrointestinal hormone response despite some minor deviations at some time points. This suggests that exercise unlikely to have a significant effecteffect on energy intakeintake in the period exercise that exerciseintensity intensityisis unlikely to have a significant on energy in the after period after despite the increased energy expenditure that occurs at higher exercise intensities
Summary
As the prevalence of obesity increases, caused by a chronic energy excess, investigations have focused on reducing energy intake and/or increasing exercise energy expenditure as an effective weight loss strategy. It has been suggested that exercise may stimulate compensatory increases in appetite and food intake that attenuates weight loss; this evidence is limited [2,3]. Previous investigations have demonstrated that high-intensity [4,5,6,7,8], but not low intensity [1,9,10,11] aerobic exercise suppresses appetite immediately after exercise. Ueda et al [12] observed that 60 min cycling at 50% maximum oxygen uptake (VO2max ) did not stimulate appetite. Strenuous exercise >60% of VO2max has been consistently shown to suppress appetite for up to 30 min after an exercise bout [13,14,15]
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