American Journal of Clinical Nutrition, Vol 66, 531-538, Copyright © 1997 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Resting metabolic rate in obese, premenopausal black women

J Albu, M Shur, M Curi, L Murphy, SB Heymsfield and FX Pi-Sunyer
Department of Medicine, Obesity Research Center, St Luke's-Roosevelt Hospital Center and Columbia University College of Physicians and Surgeons, New York, NY 10025, USA. JBA1@columbia.edu

In the United States, obesity is more prevalent in black than in non- Hispanic white women. Because low resting metabolic rate (RMR) has been suggested as a risk factor for weight gain, we compared RMR in 22 black and 20 white obese [body mass index (BMI; in kg/m2) range: 28.9-48.6 and 26.9-44.1, respectively], weight-stable, premenopausal, nondiabetic women. RMR was measured on two or three different occasions within a 1- wk period. The black and white groups did not differ significantly in age, degree of fitness, BMI, fat mass, or fat-free mass (FFM). In each group, RMR was predicted independently by FFM but not by age, degree of fitness, body fat mass, or body fat distribution. The slopes of the equations predicting RMR from FFM in black and white groups were not significantly different. However, the black women had significantly lower RMRs than the white women after adjustment for FFM measured by five body-composition models: dual-photon X-ray absorptiometry (DXA), hydrodensitometry, total body water, a three-compartment model, a four- compartment model, as well as for the absolute total-body potassium content as a measure of metabolically active FFM. By each analysis, the black women had significantly lower (P < 0.01) FFM-adjusted RMR than the white women; this difference ranged from 671 to 889 kJ/d depending on the body-composition method used to estimate FFM. This could contribute to the difference in the prevalence of obesity in the populations represented by these groups.

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