Moderate exercise, postprandial energy expenditure, and substrate use in varying meals in lean and obese men

Stiegler, P., Sparks, A. and Cunliffe, A. 2008. Moderate exercise, postprandial energy expenditure, and substrate use in varying meals in lean and obese men. International Journal of Sport Nutrition & Exercise Metabolism. 18 (1), pp. 66-78.

TitleModerate exercise, postprandial energy expenditure, and substrate use in varying meals in lean and obese men
AuthorsStiegler, P., Sparks, A. and Cunliffe, A.
Abstract

Maximizing postprandial energy expenditure and fat oxidation could be of clinical relevance for the treatment of obesity. This study investigated the effect of prior exercise on energy expenditure and substrate utilization after meals containing varying amounts of macronutrients. Eight lean (11.6% ± 4.0% body fat, M ± SD) and 12 obese (35.9% ± 5.3% body fat) men were randomly assigned to a protein (43% protein, 30% carbohydrate) or a carbohydrate (10% protein, 63% carbohydrate) meal. The metabolic responses to the meals were investigated during 2 trials, when meals were ingested after a resting period (D) or cycling exercise (Ex+D; 65% of oxygen consumption reserve, 200 kcal). Energy expenditure, substrate utilization, and glucose and insulin responses were measured for 4 hr during the postprandial phase. Although postprandial energy expenditure was not affected by prior exercise, the total amount of fat oxidized was higher during Ex+D than during D (170.8 ± 60.1 g vs. 137.8 ± 50.8 g, p < .05), and, accordingly, the use of carbohydrate as substrate was decreased (136.4 ± 45.2 g vs. 164.0 ± 42.9 g, p < .05).After the protein meal fat-oxidation rates were higher than after carbohydrate intake (p < .05), an effect independent of prior exercise. Plasma insulin tended to be lower during Ex+D (p = .072) and after the protein meal (p = .066). No statistically significant change in postprandial blood glucose was induced by prior exercise. Exercising before meal consumption can result in a marked increase in fat oxidation, which is independent of the type of meal consumed.

JournalInternational Journal of Sport Nutrition & Exercise Metabolism
Journal citation18 (1), pp. 66-78
ISSN1526-484X
YearFeb 2008
PublisherHuman Kinetics
Web address (URL)http://www.humankinetics.com/IJSNEM/viewarticle.cfm?jid=Xu8hK3mKXq8cA42yXh8pM6xPXu7bGJPuXc6hBA23Xv8qYguKXb&aid=15459&site=Xu8hK3mKXq8cA42yXh8pM6xPXu7bGJPuXc6hBA23Xv8qYguKXb
Publication dates
PublishedFeb 2008

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