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Am J Physiol Endocrinol Metab 279: E539-E545, 2000;
0193-1849/00 $5.00
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Vol. 279, Issue 3, E539-E545, September 2000

Resting energy expenditure-fat-free mass relationship: new insights provided by body composition modeling

Zimian Wang, Stanley Heshka, Dympna Gallagher, Carol N. Boozer, Donald P. Kotler, and Steven B. Heymsfield

Obesity Research Center, St. Luke's-Roosevelt Hospital, College of Physicians and Surgeons, Columbia University, New York, New York 10025

The relationship between resting energy expenditure (REE) and metabolically active fat-free mass (FFM) is a cornerstone in the study of physiological aspects of body weight regulation and human energy requirements. Important questions, however, remain unanswered regarding the observed linear REE-FFM association in adult humans. This led us to develop a series of REE-body composition models that provide insights into the widely used simple linear REE-FFM prediction model derived experimentally in adult humans. The new models suggest that the REE-FFM relationship in mammals as a whole is curvilinear, that a segment of this function within a FFM range characteristic of adult humans can be fit with a linear equation almost identical to that observed from a composite review of earlier human studies, and that mammals as a whole exhibit a decrease in the proportion of FFM as high metabolic rate organs with greater FFM. The present study thus provides a new approach for examining REE-FFM relationships, advances in a quantitative manner previously observed albeit incompletely formulated REE-body composition associations, and identifies areas in need of additional research.

energy metabolism; body composition


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