Title |
Effect of exercise intensity on 24-h energy expenditure and nutrient oxidation
|
---|---|
Published in |
Journal of Applied Physiology, March 2002
|
DOI | 10.1152/japplphysiol.00706.2001 |
Pubmed ID | |
Authors |
Edward L. Melanson, Teresa A. Sharp, Helen M. Seagle, Tracy J. Horton, William T. Donahoo, Gary K. Grunwald, Jere T. Hamilton, James O. Hill |
Abstract |
The aim of this study was to determine the effects of exercise at different intensities on 24-h energy expenditure (EE) and substrate oxidation. Sixteen adults (8 men and 8 women) were studied on three occasions [sedentary day (Con), a low-intensity exercise day (LI; 400 kcal at 40% of maximal oxygen consumption) and a high-intensity exercise day (HI; 400 kcal at 70% of maximal oxygen consumption)] by using whole room indirect calorimetry. Both 24-h EE and carbohydrate oxidation were significantly elevated on the exercise days (Con < LI = HI), but 24-h fat oxidation was not different across conditions. Muscle enzymatic profile was not consistently related to 24-h fat or carbohydrate oxidation. With further analysis, it was found that, compared with men, women sustained slightly higher rates of 24-h fat oxidation (mg x kg FFM(-1) x min(-1)) and had a muscle enzymatic profile favoring fat oxidation. It is concluded that exercise intensity has no effect on 24-h EE or nutrient oxidation. Additionally, it appears that women may sustain slightly greater 24-h fat oxidation rates during waking and active periods of the day. |
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