- Title
- Estimating the effects of energy imbalance on changes in body weight in children
- Creator
- Swinburn, Boyd; Jolley, Damien; Kremer, Peter; Salbe, Arline; Ravussin, Eric
- Date
- 2006
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/59035
- Identifier
- vital:867
- Identifier
- ISSN:0002-9165
- Abstract
- Background: Estimating changes in weight from changes in energy balance is important for predicting the effect of obesity prevention interventions. Objective: The objective was to develop and validate an equation for predicting the mean weight of a population of children in response to a change in total energy intake (TEI) or total energy expenditure (TEE). Design: In 963 children with a mean (+/- SD) age of 8.1 +/- 2.8 y (range: 4-18 y) and weight of 31.5 +/- 17.6 kg, TEE was measured by using doubly labeled water. Log weight (dependent variable) and log TEE (independent variable) were analyzed in a linear regression model with height, age, and sex as covariates. It was assumed that points of dynamic balance, called "settling points," occur for populations wherein energy is in balance (TEE = TEI), weight is stable (ignoring growth), and energy flux (EnFlux) equals TEE. Results: TEE (or EnFlux) explained 74% of the variance in weight. The unstandardized regression coefficient was 0.45 (95% CI: 0.38, 0.51; R-2 = 0.86) after including covariates. Conversion into proportional chances (time, to time,) gave the equation (weight(2)/weight(1)) = (EnFlux(2)/EnFlux(1))(0-45). In 3 longitudinal studies (n = 212; mean follow-up of 3.4 y), the equation predicted the mean follow-up measured weight to within 0.5%. Conclusions: The relation of EnFlux with weight was positive, which implied that a high TEI (rather than low physical activity and low TEE) was the main determinant of high body weight. Two populations of children with a 10% difference in mean EnFlux Would have a 4.5% difference in mean weight.; C1
- Publisher
- American Society for Nutrition
- Relation
- American Journal of Clinical Nutrition Vol. 83, no. 4 (2006), p. 859-863
- Rights
- Copyright American Society for Nutrition
- Rights
- This metadata is freely available under a CCO license
- Subject
- 1111 Nutrition and Dietetics; Physical activity; Longitudinal changes; Metabolic rate; Obesity; Expenditure; Girls; Childhood; Requirements; Boys
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