@misc{10481/76525,
year = {2022},
month = {7},
url = {http://hdl.handle.net/10481/76525},
abstract = {Background: This study examined the strength, shape and direction of associations of accelerometer-assessed overall,
school- and non-school-based moderate-to-vigorous physical activity (MVPA) and sedentary time (ST) with BMI
among adolescents across the world. Second, we examined whether these associations differed by study site and sex.
Methods: Cross-sectional data from the IPEN Adolescent study, an observational multi-country study, were used.
Participants wore an accelerometer for seven days, reported height and weight, and completed a socio-demographic
survey. In total, 4852 adolescents (46.6% boys), aged 11–19 years (mean age = 14.6, SD = 1.7 years) were included in
the analyses, using generalized additive mixed models.
Results: Adolescents accumulated on average 41.3 (SD = 22.6) min/day of MVPA and 531.8 (SD = 81.1) min/day of
ST, and the prevalence of overweight and obesity was 17.2% (IOTF), but these mean values differed by country. Linear
negative associations of accelerometer-based MVPA and ST with standardized BMI scores and the likelihood of being
overweight/obese were found. School-based ST and non-school-based MVPA were more strongly negatively associated
to the outcomes than non-school based ST and school-based MVPA. Study site moderated the associations;
adolescent sex did not. No curvilinear associations were found.
Conclusions: This multi-country study confirmed the importance of MVPA as a potential protective factor against
overweight/obesity in adolescents. Non-school-based MVPA seemed to be the main driver of these associations.
Unexpected results were found for ST, calling for further examination in methodologically sound international studies
but using inclinometers or pressure sensors to provide more precise ST measures.},
organization = {United States Department of Health & Human Services},
organization = {National Institutes of Health (NIH) - USA	R01 HL111378	
FWO	FWO12/ASP/102},
organization = {Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ)	306836/2011-4},
organization = {Grant Agency of the Czech Republic	GA14-26896S	
GA17-24378S},
organization = {University of Southern Denmark},
organization = {Health and Medical Research Fund (Food and Health Bureau, Government of the Hong Kong SAR, PR of China)	10111501},
organization = {Madras Diabetes Research Foundation (MDRF), Chennai},
organization = {Israel Science Foundation	916/12},
organization = {Universiti Sains Malaysia International Research Collaboration Grant},
organization = {Health Research Council of New Zealand	HRC12/329},
organization = {Portuguese Foundation for Science and Technology},
organization = {Center for Forestry Research & Experimentation (CIEF)	GV-2013-087},
organization = {United States Department of Health & Human Services},
organization = {National Institutes of Health (NIH) - USA	R01 HL083454},
organization = {Future Leader Fellowship from the National Health Foundation of Australia	ID100046},
organization = {Australian Research Council	FT140100085},
organization = {National Health and Medical Research Council (NHMRC) of Australia	APP 1176885},
organization = {United States Department of Health & Human Services},
organization = {National Institutes of Health (NIH) - USA	R01 HL111378},
publisher = {BMC},
keywords = {Adolescents},
keywords = {Exercise},
keywords = {Body weight},
keywords = {Physical activity},
keywords = {Public health},
title = {Associations of accelerometer measured school‑ and non‑school based physical activity and sedentary time with body mass index: IPEN Adolescent study},
doi = {10.1186/s12966-022-01324-x},
author = {Van Dyck, Delfien and Esteban Cornejo, Irene},
}