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Associations between energy demands, physical activity, and body composition in adult humans between 18 and 96 y of age.
Am J Clin Nutr 2010; 92(4):826-34AJ

Abstract

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 <52 y. AEE, BEE, and PAL were all negatively associated with age in subjects aged ≥52 y. An absence of a relation between age-adjusted PAL and FFM suggested that greater physical activity was not associated with higher FFM in the elderly.

Authors+Show Affiliations

Aberdeen Centre for Energy Regulation and Obesity, Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, Scotland. j.speakman@abdn.ac.ukNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20810973

Citation

Speakman, John R., and Klaas R. Westerterp. "Associations Between Energy Demands, Physical Activity, and Body Composition in Adult Humans Between 18 and 96 Y of Age." The American Journal of Clinical Nutrition, vol. 92, no. 4, 2010, pp. 826-34.
Speakman JR, Westerterp KR. Associations between energy demands, physical activity, and body composition in adult humans between 18 and 96 y of age. Am J Clin Nutr. 2010;92(4):826-34.
Speakman, J. R., & Westerterp, K. R. (2010). Associations between energy demands, physical activity, and body composition in adult humans between 18 and 96 y of age. The American Journal of Clinical Nutrition, 92(4), pp. 826-34. doi:10.3945/ajcn.2009.28540.
Speakman JR, Westerterp KR. Associations Between Energy Demands, Physical Activity, and Body Composition in Adult Humans Between 18 and 96 Y of Age. Am J Clin Nutr. 2010;92(4):826-34. PubMed PMID: 20810973.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Associations between energy demands, physical activity, and body composition in adult humans between 18 and 96 y of age. AU - Speakman,John R, AU - Westerterp,Klaas R, Y1 - 2010/09/01/ PY - 2010/9/3/entrez PY - 2010/9/3/pubmed PY - 2010/10/28/medline SP - 826 EP - 34 JF - The American journal of clinical nutrition JO - Am. J. Clin. Nutr. VL - 92 IS - 4 N2 - 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 <52 y. AEE, BEE, and PAL were all negatively associated with age in subjects aged ≥52 y. An absence of a relation between age-adjusted PAL and FFM suggested that greater physical activity was not associated with higher FFM in the elderly. SN - 1938-3207 UR - https://www.unboundmedicine.com/medline/citation/20810973/Associations_between_energy_demands_physical_activity_and_body_composition_in_adult_humans_between_18_and_96_y_of_age_ L2 - https://academic.oup.com/ajcn/article-lookup/doi/10.3945/ajcn.2009.28540 DB - PRIME DP - Unbound Medicine ER -