Isotemporal substitution analysis for sedentary behavior and body mass index

Huang, Wendy Yajun, Wong, Stephen Heung-Sang, He, Gang and Salmon, Jo 2016, Isotemporal substitution analysis for sedentary behavior and body mass index, Medicine and science in sports and exercise, vol. 48, no. 11, pp. 2135-2141, doi: 10.1249/MSS.0000000000001002.

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Title Isotemporal substitution analysis for sedentary behavior and body mass index
Author(s) Huang, Wendy Yajun
Wong, Stephen Heung-Sang
He, Gang
Salmon, JoORCID iD for Salmon, Jo
Journal name Medicine and science in sports and exercise
Volume number 48
Issue number 11
Start page 2135
End page 2141
Total pages 7
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-11
ISSN 0195-9131
Keyword(s) screen time
physical activity
Summary This study examined the prospective associations of reallocating time spent in different types of sedentary behavior, physical activity, and sleep with body mass index (BMI) in children using isotemporal substitution analysis. Methods Chinese children in grades 1-3 were recruited to a cohort study in 2009 and were followed up over a 2-yr period. Reports were gathered from the parents on children's sedentary behavior, sleep duration, and sociodemographic variables. The reported sedentary behavior types were then grouped into three categories: screen time (e.g., watching TV), academic-related activities (e.g., doing homework), and other sedentary behaviors (e.g., sitting and talking). Moderate-to-vigorous physical activity (MVPA) and light-intensity physical activity were assessed by ActiGraph accelerometry (ActiGraph, Pensacola, FL). Isotemporal substitution models were performed to examine the effects of time allocation on BMI. Results A total of 672 children (359 boys, mean age at recruitment = 7.6 yr) who had provided valid accelerometer data for at least one assessment time point were included in the analysis. Controlling for covariates and total behavior time, isotemporal substitution models indicated that the displacement of 30 min·d -1 of other sedentary behaviors with equal amounts of screen time (B = 0.12; 95% confidence interval, 0.04-0.20) or academic-related activities (B = 0.13; 95% confidence interval, 0.04-0.21) was associated with higher BMI. Reallocating 30 min·d -1 of MVPA with each of the sedentary behavior variables resulted in increased BMI. Conclusions The substitution of screen time or academic-related activities with other sedentary behaviors or MVPA was associated with lower BMI in Chinese children.
Language eng
DOI 10.1249/MSS.0000000000001002
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 920401 Behaviour and Health
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
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Document type: Journal Article
Collections: Faculty of Health
School of Exercise and Nutrition Sciences
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