Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/86405
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Type: Journal article
Title: Weight-loss induced changes in physical activity and activity energy expenditure in overweight and obese subjects before and after energy restriction
Author: Bonomi, A.
Soenen, S.
Goris, A.
Westerterp, K.
Citation: PLoS One, 2013; 8(3):e59641-1-e59641-8
Publisher: Public Library of Science
Issue Date: 2013
ISSN: 1932-6203
1932-6203
Editor: Johannsen, D.
Statement of
Responsibility: 
Alberto G. Bonomi, Stijn Soenen, Annelies H. C. Goris, Klaas R. Westerterp
Abstract: Activity energy expenditure (AEE) is the component of daily energy expenditure that is mainly influenced by the amount of physical activity (PA) and by the weight of the body displaced. This study aimed at analyzing the effect of weight loss on PA and AEE. The body weight and PA of 66 overweight and obese subjects were measured at baseline and after 12 weeks of 67% energy restriction. PA was measured using a tri-axial accelerometer for movement registration (Tracmor) and quantified in activity counts. Tracmor recordings were also processed using a classification algorithm to recognize 6 common activity types engaged in during the day. A doubly-labeled water validated equation based on Tracmor output was used to estimate AEE. After weight loss, body weight decreased by 13±4%, daily activity counts augmented by 9% (95% CI: +2%, +15%), and this increase was weakly associated with the decrease in body weight (R(2) = 7%; P<0.05). After weight loss subjects were significantly (P<0.05) less sedentary (-26 min/d), and increased the time spent walking (+11 min/d) and bicycling (+4 min/d). However, AEE decreased by 0.6±0.4 MJ/d after weight loss. On average, a 2-hour/day reduction of sedentary time by increasing ambulatory and generic activities was required to restore baseline levels of AEE. In conclusion, after weight loss PA increased but the related metabolic demand did not offset the reduction in AEE due to the lower body weight. Promoting physical activity according to the extent of weight loss might increase successfulness of weight maintenance.
Keywords: Humans
Obesity
Weight Loss
Caloric Restriction
Motor Activity
Energy Metabolism
Acceleration
Adult
Aged
Middle Aged
Female
Male
Rights: © 2013 Bonomi et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI: 10.1371/journal.pone.0059641
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