Determinants of Free‐Living Energy Expenditure in Normal Weight and Obese Women Measured by Doubly Labeled Water

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Abstract
Total free‐living energy expenditure (TEE) was measured in 9 normal weight controls and 5 obese women using the doubly labeled water (DLW) method. Resting energy expenditure (REE) and the thermic effect of food (TEF) were measured by indirect calorimetry and the energy cost of physical activity (PA) calculated by deduction, in order to quantify the components and identify determinants of free‐living TEE. Although REE was quantitatively the major component of TEE in both groups, PA best explained the variability, contributing 76% to the variance in free‐living TEE. The obese women had elevated values for TEE (12397+/‐2565 vs. 8339+/‐1787 kJ/d, mean+/‐SD; p.