Influence of fat-free mass and functional status on resting energy expenditure in underweight elders

In underweight elders, resting energy expenditure (REE) and its relationship with fat-free mass (FFM) could be modified by sarcopenia, physical activity, and functional limitation. The aims of this study were to investigate REE and its relationship with quantity and metabolic activity of FFM and to...

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Published in:The journals of gerontology. Series A, Biological sciences and medical sciences Biological sciences and medical sciences, 2002-05, Vol.57 (5), p.M302-M307
Main Authors: Sergi, Giuseppe, Coin, Alessandra, Bussolotto, Mauro, Benincà, Paolo, Tomasi, Giovanna, Pisent, Claudia, Peruzza, Silvia, Inelmen, Emine M, Enzi, Giuliano
Format: Article
Language:English
Subjects:
Activities of Daily Living
Adipose Tissue - pathology
Aged
Aged, 80 and over
Aging - physiology
Body Composition
Body Weight
Energy Metabolism
Female
Humans
Male
Metabolism
Older people
Reference Values
Rest
Thinness - pathology
Thinness - physiopathology
Weight
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Summary:In underweight elders, resting energy expenditure (REE) and its relationship with fat-free mass (FFM) could be modified by sarcopenia, physical activity, and functional limitation. The aims of this study were to investigate REE and its relationship with quantity and metabolic activity of FFM and to evaluate the influence of functional status on REE in underweight elderly subjects. Forty-eight underweight elders (BMI < 20) and 54 normal weight elderly subjects (BMI 20-30) as a control group were selected. Body composition was determined by dual energy x-ray absorptiometry (DEXA). REE was measured by indirect calorimetry. Ability in activities of daily living (ADLs) was assessed by the Katz index. Underweight elders had significantly lower FFM, FFM index (FFM/height(2)), and REE than healthy subjects. REE adjusted for FFM with analysis of covariance remained significantly lower in the underweight group (1287 +/- 85 vs 1715 +/- 139 kcal/day in men, and 1124 +/- 63 vs 1366 +/- 91 kcal/day in women). Katz index in the underweight group was inversely correlated with REE (r = -0.68; p
ISSN:1079-5006
1758-535X
DOI:10.1093/gerona/57.5.m302