Abstract no. 470: Energy intake, expenditure and appetite following exercise of different intensity in non-obese men. Ghalia Shamlan, M.D.Robertson & A.L.Collins. Department of Nutrition and Metabolism, University of Surrey Appetite control (i.e. control of energy intake) is important for weight maintenance. Exercise is the most variable component of energy expenditure but its impact is beyond the energy cost of exercise including physiological, behavioural, and appetite effects. Exercise is known to acutely influence effect appetite but there is a lack of evidence as to the independent effect of intensity. This study investigated the role exercise intensity on appetite and gut derived hormones, energy intake (EI) and subjective measures of appetite. One hour after a standardised breakfast, 14 healthy normal- weight volunteers subjects undertook either 8 repeated 60 second bouts of cycling at 95% VO2 max (high intensity) or 30 minutes of continuous cycling, at a fixed cadence, equivalent to 50% of the participant‘s VO2 max (low intensity) in randomised crossover design. Ghrelin, polypeptide YY (PYY), glucagon-like peptide-1 (GLP-1) and pancreatic polypeptide (PP) were measured in the fasting state, Pre- exercise and post-exercise. Subjective satiety were assessed throughout the study using visual analogue scales and subsequent ad libitum intake of a pasta meal was measured at the end (3-h post-breakfast). No significant effect of exercise was observed on the average of ad libitum meal or 24 hour energy intake postexercise. Hunger scores were significantly decreased for exercise for high intensity (HIE). HIE significantly increased fat oxidation compared to low intensity (LIE) at 15 minutes post-exercise. Despite no significant difference in energy intake for 2 days post-exercise between two intensities, dietary carbohydrate intake was higher after LIE, not noted until the second day after exercise. In conclusion, currently, there are mechanisms and consequences of exercise in short and long-term appetite control; however, these mechanisms warrant further explanation. These results support the need for future research in to the role of in regulation energy balance, especially for obese people
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