Journal of Applied Physiology
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J Appl Physiol 80: 1743-1748, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology, Vol 80, Issue 5 1743-1748, Copyright © 1996 by American Physiological Society

ARTICLES

Determinants of basal fat oxidation in healthy Caucasians

T. R. Nagy, M. I. Goran, R. L. Weinsier, M. J. Toth, Y. Schutz and E. T. Poehlman
Department of Medicine, University of Vermont, Burlington 05405, USA.

In a retrospective study, we examined several determinants of basal fat oxidation in 720 healthy Caucasian volunteers. Adult men (n = 427) and women (n = 293) were characterized for resting energy expenditure and substrate oxidation by indirect calorimetry (after a 12-h overnight fast), peak O2 consumption by a treadmill test to exhaustion, body composition by hydrodensitometry, food intake from a 3-day food diary, and hormonal status by fasting hormone concentrations. Fat oxidation was negatively correlated with fat mass in men (r = -0.11; P < 0.05), but no statistical relationship was found in women. In a stepwise multiple regression analysis, fat oxidation was best predicted by peak O2 consumption and fat-free mass in men (model R2 = 0.142) and by free thyroxine, fat-free mass, and fasting insulin in women (model R2 = 0.153). Relative rates of fat oxidation (fat oxidation adjusted for differences in resting energy expenditure) were not correlated with fat mass in either gender. Women showed a lower rate of basal fat oxidation (both absolute and adjusted) than did men. Our results show that fat oxidation is not greater in individuals with a greater fat mass. Furthermore, our results support a sexual dimorphism in basal rates of fat oxidation.


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