Organ-tissue mass measurement allows modeling of REE and metabolically active tissue mass

作者：Dympna Gallagher, Daniel García Belmonte, Paul Deurenberg, ZiMian Wang, Norman Krasnow, F. Xavier Pi‐Sunyer, Steven B. Heymsfield · 发表于：American Journal of Physiology-Endocrinology and Metabolism · 年份：1998 · DOI：10.1152/ajpendo.1998.275.2.e249 · 被引用次数：475 · 研究领域：Diet and metabolism studies、Body Composition Measurement Techniques、Adipose Tissue and Metabolism

Investigators have expressed interest in the associations between resting energy expenditure (REE) and body mass for over a century. Traditionally, descriptive models using regression analysis are applied, linking REE with metabolically active compartments such as body cell mass (BCM) and fat-free body mass (FFM). Recently developed whole body magnetic resonance imaging (MRI) and echocardiography methods now allow estimation of all major organs and tissue volumes in vivo. Because measured values are available for REE, BCM, and FFM content of individual organs and tissues, it should now be possible to develop energy expenditure-body composition estimation models based on MRI-measured organ-tissue volumes. Specifically, the present investigation tested the hypothesis that in vivo estimation of whole body REE, BCM, and FFM is possible using MRI- and echocardiography-derived organ volumes combined with previously reported organ-tissue metabolic rates and chemical composition. Thirteen subjects (5 females, 8 males) had REE, BCM, and FFM measured by indirect calorimetry, whole body 40K counting, and dual-energy X-ray absorptiometry, respectively. Models developed from estimated and measured variables were highly correlated, with no significant differences between those estimated and measured [e.g., calculated vs. measured REE: r = 0.92, P < 0. 001; (mean +/- SD) 6,962 +/- 1,455 and 7,045 +/- 1,450 kJ/day, respectively (P = not significant)]. Strong associations were observed betwee...