title: Appetite, energy intake and resting metabolic responses to 60 min treadmill running performed in a fasted versus a postprandial state.
abstract: This study investigated the effect of fasted and postprandial exercise on appetite, energy intake and resting metabolic responses. Twelve healthy males (mean±SD: age 23±3 years, body mass index 22.9±2.1 kg m(-2), maximum oxygen uptake 57.5±9.7 mL kg(-1) min(-1)) performed three 10 h experimental trials (control, fasted exercise and postprandial exercise) in a Latin Square design. Trials commenced at 8 am after an overnight fast. Sixty min of treadmill running at ∼70% of maximum oxygen uptake was performed at 0-1 h in the fasted exercise trial and 4-5 h in the postprandial exercise trial. A standardised breakfast was provided at 1.5 h and ad libitum buffet meals at 5.5 and 9.5 h. Appetite ratings and resting expired air samples were collected throughout each trial. Postprandial exercise suppressed appetite to a greater extent than fasted exercise. Ad libitum energy intake was not different between trials, resulting in a negative energy balance in exercise trials relative to control after accounting for differences in energy expenditure (control: 9774±2694 kJ; fasted exercise: 6481±2318 kJ; postprandial exercise: 6017±3050 kJ). These findings suggest that 60 min treadmill running induces a negative daily energy balance relative to a sedentary day but is no more effective when performed before or after breakfast.
authors.affiliation: School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK.
authors.forename: Kevin
authors.initials: K
authors.lastname: Deighton
authors.forename: Jessica C
authors.initials: JC
authors.lastname: Zahra
authors.forename: David J
authors.initials: DJ
authors.lastname: Stensel
mesh_terms: D000328:Adult; D001069:Appetite Regulation / Q000502:physiology*; D001481:Basal Metabolism / Q000502:physiology*; D015992:Body Mass Index; D004032:Diet; D002149:Energy Intake / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D005080:Exercise Test; D005215:Fasting / Q000378:metabolism*; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D019518:Postprandial Period / Q000502:physiology*; D012420:Running / Q000502:physiology*; D055815:Young Adult