Increases in dietary PA decrease fat oxidation and daily energy expenditure, whereas decreases in PA and increases in OA had the opposite effect. Increases in dietary PA may increase the risk of obesity and insulin resistance.
Increases in dietary PA decrease fat oxidation and daily energy expenditure, whereas decreases in PA and increases in OA had the opposite effect. Increases in dietary PA may increase the risk of obesity and insulin resistance.
Background: During feeding trials, it is useful to predict daily energy expenditure (DEE) to estimate energy requirements and to assess subject compliance. Objective: We examined predictors of DEE during a feeding trial conducted in a clinical research center. Design: During a 28-d period, all food consumed by 26 healthy, nonobese, young adults was provided by the investigators. Energy intake was adjusted to maintain constant body weight. Before and after this period, fat-free mass (FFM) and fat mass were assessed by using dual-energy X-ray absorptiometry, and DEE was estimated from the change (after Ҁ before) in body energy (⌬BE) and in observed energy intake (EI): DEE ҃ EI Ҁ ⌬BE. We examined the relation of DEE to pretrial resting energy expenditure (REE), FFM, REE derived from the average of REE and calculated from FFM [REE ҃ (21.2 ҂ FFM) ѿ 415], and an estimate of DEE based on the Harris-Benedict equation (HB estimate) (DEE ҃ 1.6 REE). Results: DEE correlated (P 0.001) with FFM (r ҃ 0.78), REE (r ҃ 0.73), average REE (r ҃ 0.82), and the HB estimate (r ҃ 0.81). In a multiple regression model containing all these variables, R 2 was 0.70. The mean (ȀSEM) ratios of DEE to REE, to average REE, and to the HB estimate were 1.86 Ȁ 0.06, 1.79 Ȁ 0.04, and 1.02 Ȁ 0.02, respectively. Conclusions: Although a slightly improved prediction of DEE is possible with multiple measurements, each of these measurements suggests that DEE equals 1.60 -1.86 ҂ REE. The findings are similar to those of previous studies that describe the relation of REE to DEE measured directly.Am J Clin Nutr 2004;80:876 -80.
KEY WORDSDaily energy expenditure, resting energy expenditure, energy balance, dual-energy X-ray absorptiometry, feeding trials
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