International study of objectively measured physical activity and sedentary time with body mass index and obesity: IPEN adult study Dyck,DV, Cerin,E, De Bourdeaudhuij,I, Hinckson,E, Reis,RS, Davey,R, Sarmiento,OL, Mitas,J, Troelsen,J, MacFarlane,D, Salvo,D, Aguinaga-Ontoso,I, Owen,N, Cain,KL and Sallis,JF 2014, International study of objectively measured physical activity and sedentary time with body mass index and obesity: IPEN adult study, International journal of obesity, vol. 39, no. 2, pp. 199-207, doi: 10.1038/ijo.2014.115. Attached Files Name Description MIMEType Size Downloads Title International study of objectively measured physical activity and sedentary time with body mass index and obesity: IPEN adult study Author(s) Dyck,DV Cerin,E De Bourdeaudhuij,I Hinckson,E Reis,RS Davey,R Sarmiento,OL Mitas,J Troelsen,J MacFarlane,D Salvo,D Aguinaga-Ontoso,I Owen,N Cain,KL Sallis,JF Journal name International journal of obesity Volume number 39 Issue number 2 Start page 199 End page 207 Total pages 9 Publisher Macmillan Publishers Place of publication London, Eng. Publication date 2014-07-02 ISSN 1476-5497 Summary BACKGROUND: Physical activity (PA) has been consistently implicated in the etiology of obesity, whereas recent evidence on the importance of sedentary time remains inconsistent. Understanding of dose-response associations of PA and sedentary time with overweight and obesity in adults can be improved with large-scale studies using objective measures of PA and sedentary time. The purpose of this study was to examine the strength, direction and shape of dose-response associations of accelerometer-based PA and sedentary time with body mass index (BMI) and weight status in 10 countries, and the moderating effects of study site and gender. METHODS: Data from the International Physical activity and the Environment Network (IPEN) Adult study were used. IPEN Adult is an observational multi-country cross-sectional study, and 12 sites in 10 countries are included. Participants wore an accelerometer for seven consecutive days, completed a socio-demographic questionnaire and reported height and weight. In total, 5712 adults (18-65 years) were included in the analyses. Generalized additive mixed models, conducted in R, were used to estimate the strength and shape of the associations. RESULTS: A curvilinear relationship of accelerometer-based moderate-to-vigorous PA and total counts per minute with BMI and the probability of being overweight/obese was identified. The associations were negative, but weakened at higher levels of moderate-to-vigorous PA (>50 min per day) and higher counts per minute. No associations between sedentary time and weight outcomes were found. Complex site- and gender-specific findings were revealed for BMI, but not for weight status. CONCLUSIONS: On the basis of these results, the current Institute of Medicine recommendation of 60 min per day of moderate-to-vigorous PA to prevent weight gain in normal-weight adults was supported. No relationship between sedentary time and the weight outcomes was present, calling for further examination. If moderator findings are confirmed, the relationship between PA and BMI may be country- and gender-dependent, which could have important implications for country-specific health guidelines. © 2015 Macmillan Publishers Limited All rights reserved. Language eng DOI 10.1038/ijo.2014.115 Field of Research 110699 Human Movement and Sports Science not elsewhere classified Socio Economic Objective 929999 Health not elsewhere classified HERDC Research category C1 Refereed article in a scholarly journal ERA Research output type C Journal article Copyright notice ©2014, Macmillan Publishers Persistent URL http://hdl.handle.net/10536/DRO/DU:30068985 Document type: Journal Article Collections: Faculty of Health School of Exercise and Nutrition Sciences Related Links Link Description Connect to published version Go to link with your DU access privileges   Author URL Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Tue, 13 Jan 2015, 13:40:19 EST Wed, 14 Jan 2015, 04:00:54 EST Wed, 14 Jan 2015, 05:06:13 EST Thu, 22 Jan 2015, 12:51:57 EST Thu, 22 Jan 2015, 13:08:58 EST Thu, 22 Jan 2015, 13:15:38 EST Thu, 22 Jan 2015, 13:22:13 EST Tue, 14 Apr 2015, 13:45:00 EST Tue, 14 Apr 2015, 13:46:16 EST Mon, 08 Jun 2015, 12:44:00 EST Wed, 14 Oct 2015, 14:09:17 EST Mon, 24 Apr 2017, 10:22:32 EST Filtered Full Citation counts:   Cited 50 times in TR Web of Science Cited 50 times in Scopus Search Google Scholar Access Statistics: 154 Abstract Views, 1 File Downloads  -  Detailed Statistics Created: Tue, 13 Jan 2015, 13:40:19 EST

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