Journal
APPLIED PHYSIOLOGY NUTRITION AND METABOLISM-PHYSIOLOGIE APPLIQUEE NUTRITION ET METABOLISME
Volume 38, Issue 1, Pages 66-72Publisher
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/apnm-2012-0104
Keywords
physical activity; relative energy intake; food intake; sex differences; appetite
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Funding
- Cal Poly San Luis Obispo Extramural Funding Initiative
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Acute exercise suppresses relative energy intake; however, it remains unclear whether this occurs in both men and women exposed to the same relative exercise treatment. Eleven healthy men (22 +/- 2 years; 16% +/- 6% body fat (BF); 26 +/- 4 body mass index (BMI); 42.9 +/- 6.5 mL.kg(-1).min(-1) peak oxygen consumption ((V) over dotO(2peak))) and 10 healthy women (21 +/- 2 years; 24 +/- 2 BMI; 23% +/- 3% BF; 39.9 +/- 5.5 mL.kg(-1).min(-1) (V) over dotO(2peak)) rested for 60 min or exercised on a cycle ergometer at 70% (V) over dotO(2peak) until 30% of total daily energy expenditure was expended (men, expenditure = 975 +/- 195 kcal in 82 +/- 13 min; women, expenditure = 713 +/- 86 kcal in 84 +/- 17 min) in a counterbalanced, crossover fashion. Appetite hormones and appetite ratings were assessed in response to each condition. Forty minutes after both conditions, ad libitum total and relative energy intake (energy intake minus energy cost of exercise) were assessed at a buffet meal. There was no significant sex or condition effect in appetite hormones (PYY3-36, acylated ghrelin, insulin) and appetite ratings (hunger, satisfaction, fullness). Total energy intake in men was significantly higher (P < 0.05) in exercise and rest conditions (1648 +/- 950, 1216 +/- 633 kcal, respectively) compared with women (591 +/- 183, 590 +/- 231 kcal, respectively). Relative energy intake was significantly lower (P < 0.05) after exercise compared with rest in men (672 +/- 827, 1133 +/- 619 kcal, respectively) and women (-121 +/- 243, 530 +/- 233 kcal, respectively). These data highlight the effectiveness of acute exercise to suppress relative energy intake regardless of sex.
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