American Journal of Clinical Nutrition, Vol 46, 875-885, Copyright © 1987 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

A reappraisal of the caloric requirements of men

OE Owen, JL Holup, DA D'Alessio, ES Craig, M Polansky, KJ Smalley, EC Kavle, MC Bushman, LR Owen and MA Mozzoli
Department of Medicine, Temple University School of Medicine, Philadelphia, PA 19140.

The resting metabolic rates (RMR) of 60 lean and obese men, aged 18-82 y and weighing 60-171 kg, were measured and body compositions were determined. Body compositional variables reflecting active protoplasmic tissue were all highly interrelated. Body weight alone gave prediction values for RMR that were comparable to those of other variables of active protoplasmic tissue mass. Regional distribution of fat had no influence on the RMR and the influence of age on RMR was trivial. The classic prediction equations and tables overestimate RMR of men. The 95%-confidence limits for both lean and obese men were broad. This conclusively demonstrates that metabolic efficiency is not necessarily or exclusively related to obesity. New regression equations for predicting the RMR based on weight and fat-free mass were developed: RMR = 879 + 10.2 WT kg and RMR = 290 + 22.3 FFMD kg, where FFMD is fat- free mass from densitometry measurements.

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