HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Citation Map Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Stubbs, R J. Articles by Blundell, J. E Search for Related Content PubMed PubMed Citation Articles by Stubbs, R J. Articles by Blundell, J. E Agricola Articles by Stubbs, R J. Articles by Blundell, J. E

A decrease in physical activity affects appetite, energy, and nutrient balance in lean men feeding ad libitum^1,2,3,4

¹ From Biomathematics and Statistics Scotland, Aberdeen, United Kingdom (GWH); the Rowett Research Institute, Aberdeen, United Kingdom (RJS, DAH, and AMJ); and the BioPsychology Group, Psychology Department, Leeds University, Leeds, United Kingdom (NK and JEB).

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.

Key Words: Exercise • sedentariness • calorimetry • humans • energy balance • appetite

This article has been cited by other articles:

				H. Hare-Bruun, A. Flint, and B. L Heitmann Glycemic index and glycemic load in relation to changes in body weight, body fat distribution, and body composition in adult Danes. Am. J. Clinical Nutrition, October 1, 2006; 84(4): 871 - 879. [Abstract] [Full Text] [PDF]