A decrease in physical activity affects appetite, energy and nutrient balance in lean men feeding ad libitum

Stubbs, R. James, Hughes, Darren A., Johnstone, Alexandra M., Horgan, Graham W., King, Neil A., & Blundell, John E. (2004) A decrease in physical activity affects appetite, energy and nutrient balance in lean men feeding ad libitum. American Journal of Clinical Nutrition, 79(1), pp. 62-69.

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Background: It is not clear how decreased activity quantitatively affects energy balance (EB) in subjects feeding ad libitum.

Objective: We assessed the effect of an imposed sedentary routine on appetite, energy intake (EI), EB, and nutrient balance in lean men for 7 d.

Design: Six men with a mean (±SD) age of 23.0 ± 2.3 y, weight of 69.2 ± 11.4 kg, and height of 1.76 ± 0.07 m were each studied twice during a sedentary [1.4 x resting metabolic rate (RMR)] and a moderately active (1.8 x RMR) regimen. During each treatment, they resided in the whole-body indirect calorimeter for the 7 d and had ad libitum access to a medium-fat diet of constant, measurable composition. Meal size, frequency, and composition were continually monitored. Motivation to eat was recorded during waking hours. Subjects were weighed in light clothing each morning, and their weight was corrected to nude.

Results: Energy expenditure was 9.7 and 12.8 MJ/d [P < 0.01; SE of the difference between means (SED) = 0.41] during the sedentary and active regimens, respectively. EI was 13.5 and 14.4 MJ/d (P = 0.463, SED = 1.06), respectively. There was no regimen effect on hunger, appetite, or body weight. By day 7, cumulative EB was 26.3 and 11.1 MJ, respectively.

Conclusions: Reducing a level of physical activity from 1.8 to 1.4 x RMR can markedly affect EB. A sedentary routine does not induce a compensatory reduction of EI and leads to a significantly positive EB, most of which is stored as fat.

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ID Code: 8501
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal’s website (see hypertext link) or contact the author.
Author contact details: n.king@qut.edu.au
Additional URLs:
Keywords: Key Words, Exercise • sedentariness • calorimetry • humans • energy balance • appetite
ISSN: 0002-9165
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > NUTRITION AND DIETETICS (111100) > Nutrition and Dietetics not elsewhere classified (111199)
Divisions: Past > Research Centres > Centre for Health Research
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2004 American Society for Clinical Nutrition
Deposited On: 09 Jul 2007 00:00
Last Modified: 18 Mar 2015 02:40

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