In:
American Journal of Physiology-Endocrinology and Metabolism, American Physiological Society, Vol. 278, No. 2 ( 2000-02-01), p. E308-E315
Abstract:
Resting energy expenditure (REE) and components of fat-free mass (FFM) were assessed in 26 healthy nonobese adults (13 males, 13 females). Detailed body composition analyses were performed by the combined use of dual-energy X-ray absorptiometry (DEXA), magnetic resonance imaging (MRI), bioelectrical impedance analysis (BIA), and anthropometrics. We found close correlations between REE and FFM BIA ( r = 0.92), muscle mass DEXA ( r = 0.89), and sum of internal organs MRI ( r = 0.90). In a multiple stepwise regression analysis, FFM BIA alone explained 85% of the variance in REE (standard error of the estimate 423 kJ/day). Including the sum of internal organs MRI into the model increased the r 2 to 0.89 with a standard error of 381 kJ/day. With respect to individual organs, only skeletal muscle DEXA and liver mass MRI significantly contributed to REE. Prediction of REE based on 1) individual organ masses and 2) a constant metabolic rate per kilogram organ mass was very close to the measured REE, with a mean prediction error of 96 kJ/day. The very close agreement between measured and predicted REE argues against significant variations in specific REEs of individual organs. In conclusion, the mass of internal organs contributes significantly to the variance in REE.
Type of Medium:
Online Resource
ISSN:
0193-1849
,
1522-1555
DOI:
10.1152/ajpendo.2000.278.2.E308
Language:
English
Publisher:
American Physiological Society
Publication Date:
2000
detail.hit.zdb_id:
1477331-4
SSG:
12
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