Appetite and Energy Intake Regulation in Response to Acute Exercise.

PURPOSE To determine if energy intake and appetite regulation differ in response to an acute bout of resistance exercise (REx) vs aerobic exercise (AEx). METHODS Physically inactive adults (n=24, 35±2% body fat, 50% female) completed 3 conditions: AEx (walking at 65-70% heart rate max for 45 minutes); REx (1-set to failure of 12 exercises); and sedentary control (SED). Each condition was initiated in the post-prandial state (35 minutes post breakfast). Appetite (visual analogue scale [VAS] for hunger, satiety, and prospective food consumption and hormones (ghrelin, PYY, and GLP-1) were measured before and 30, 90, 120, 150, and 180-minutes following a standardized breakfast. Area under the curve (AUC) was calculated using the trapezoid method. Ad libitum energy intake was evaluated at a lunch meal following the 180-minute measurements. RESULTS No differences in ad libitum energy intake (REx: 991±68; AEx: 937±65; SED: 944±76 kcals, p=0.50), nor appetite ratings (all p>0.05) were detected. AUC for ghrelin, PYY, and GLP-1 were all lower following REx vs. AEx (Ghrelin: REx: 130,737±4,928; AEx: 143,708±7,500, p=0.006; PYY: REx: 20,540±1,177; AEx: 23,812±1,592, p=0.001; and GLP-1: REx: 1,314±93; AEx: 1,615±110, p=0.013). Neither exercise condition significantly differed from SED. CONCLUSIONS Acute REx lowers both orexigenic (ghrelin) and anorectic (PYY and GLP-1) gut peptides compared to acute AEx. Ad libitum energy intake did not increase compared to SED in either exercise condition, indicating both exercise modalities have appetite and energy intake suppressing effects. Future work is needed to determine if exercise of differing modalities influences chronic appetite regulation.