Associations between energy demands, physical activity, and body composition in adult humans between 18 and 96 y of age

BACKGROUND: Associations between body composition and the energy expended on basal metabolism and activity are complex and age dependent. OBJECTIVE: The objective was to examine associations between body composition and daily (DEE), basal (BEE), and activity energy expenditure (AEE) throughout the a...

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Bibliographic Details
Published in:The American journal of clinical nutrition 2010-10, Vol.92 (4), p.826-834
Main Authors: Speakman, John R, Westerterp, Klaas R
Format: Article
Language:English
Subjects:
activity energy expenditure
Adipose Tissue - anatomy & histology
Adolescent
Adult
Adults
age
Aged
Aged, 80 and over
basal energy expenditure
Biological and medical sciences
Body Composition
body fat
Correlation analysis
daily energy expenditure
Diet
elderly
energy expenditure
Energy Metabolism
Exercise
fat free mass
Feeding. Feeding behavior
Female
Fundamental and applied biological sciences. Psychology
gender differences
human nutrition
Humans
Male
men
Metabolism
Middle Aged
Motor Activity
Nutrition
nutritional status
physical activity
Regression Analysis
Sex Characteristics
Vertebrates: anatomy and physiology, studies on body, several organs or systems
women
Young Adult
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Summary:BACKGROUND: Associations between body composition and the energy expended on basal metabolism and activity are complex and age dependent. OBJECTIVE: The objective was to examine associations between body composition and daily (DEE), basal (BEE), and activity energy expenditure (AEE) throughout the adult life span. DESIGN: A cross-sectional study was conducted in 529 adults aged 18-96 y. DEE was measured by using doubly labeled water, BEE by using respirometry, and body composition by isotope dilution. AEE was calculated as DEE - BEE, and physical activity level (PAL) was calculated as DEE/BEE. RESULTS: Up to age 52 y, fat-free mass (FFM) and fat mass (FM) were positively associated with age in men, but no significant effect was observed in women. No effects of age on DEE and AEE were observed. The average DEE in men (14.1 MJ/d) was 27% greater than that in women (10.7 MJ/d). PAL averaged 1.84 in men and 1.75 in women. Above and including the age of 52 y, FFM, FM, DEE, BEE, and AEE were all negatively associated with greater age. The effect of age on AEE was greater than on BEE; consequently, PAL by the age of 95 y was only 1.36. PAL and AEE were both unrelated to FFM (both age adjusted). CONCLUSIONS: PAL and AEE were not associated with age in subjects aged
ISSN:0002-9165
1938-3207
DOI:10.3945/ajcn.2009.28540