Nan Li1, Pei Zhao1, Chengming Diao1, Yijuan Qiao1, Peter T Katzmarzyk2, Jean-Philippe Chaput3, Mikael Fogelholm4, Rebecca Kuriyan5, Anura Kurpad5, Estelle V Lambert6, Carol Maher7, Jose Maia8, Victor Matsudo9, Timothy Olds7, Vincent Onywera10, Olga L Sarmiento11, Martyn Standage12, Mark S Tremblay3, Catrine Tudor-Locke13, Gang Hu14. 1. Tianjin Women's and Children's Health Center, Tianjin, China. 2. Pennington Biomedical Research Center, Baton Rouge, LA, USA. 3. Children's Hospital of Eastern Ontario Research Institute, Ottawa, ON, Canada. 4. Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland. 5. St. Johns Research Institute, Bangalore, India. 6. Division of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Cape Town, South Africa. 7. Alliance for Research In Exercise Nutrition and Activity (ARENA), School of Health Sciences, University of South Australia, Adelaide, SA, Australia. 8. CIFI2D, Faculdade de Desporto, University of Porto, Porto, Portugal. 9. Center of Studies from the Physical Fitness Research Laboratory, de São Caetano do Sul, Sao Paulo, Brazil. 10. Department of Recreation Management and Exercise Science, Kenyatta University, Nairobi, Kenya. 11. School of Medicine Universidad de los Andes, Bogota, Colombia. 12. Department for Health, University of Bath, Bath, UK. 13. Department of Kinesiology, University of Massachusetts Amherst, Amherst, MA, USA. 14. Pennington Biomedical Research Center, Baton Rouge, LA, USA. gang.hu@pbrc.edu.
Abstract
OBJECTIVE: To evaluate the single and joint associations of objectively measured moderate-to-vigorous physical activity (MVPA) and sedentary time on week and weekend days with obesity in children from 12 countries across all inhabited continents. METHODS: A multinational, 12-country cross-sectional study of 5779 children aged 9-11 years was conducted. Time spent in MVPA and sedentary behaviors was assessed by waist-worn accelerometry. Logistic regression was used to examine the independent and joint associations of MVPA and sedentary time on weekdays and weekend with the odds of obesity. RESULTS: After adjustment for all confounding factors, the odds ratios (ORs) of childhood obesity were the highest among children with a low level of MVPA on both weekdays and weekend (OR 4.67), high among children with a high level of MVPA on weekdays and a low level of MVPA on weekend (OR 1.99) and high among children with a low level of MVPA on weekdays and a high levels of MVPA on weekend (OR 2.20), compared to those with a high level of MVPA on both weekdays and weekend. Similarly, the ORs of childhood obesity were significantly higher among children with a high level of sedentary time on both weekdays and weekend (OR 1.87) compared with those with low levels of sedentary time on both weekdays and weekend. CONCLUSIONS: Lower levels of MVPA or higher levels of sedentary time on either weekdays or weekend were associated with increased odds of obesity in 9-11 year old children in 12 countries.
OBJECTIVE: To evaluate the single and joint associations of objectively measured moderate-to-vigorous physical activity (MVPA) and sedentary time on week and weekend days with obesity in children from 12 countries across all inhabited continents. METHODS: A multinational, 12-country cross-sectional study of 5779 children aged 9-11 years was conducted. Time spent in MVPA and sedentary behaviors was assessed by waist-worn accelerometry. Logistic regression was used to examine the independent and joint associations of MVPA and sedentary time on weekdays and weekend with the odds of obesity. RESULTS: After adjustment for all confounding factors, the odds ratios (ORs) of childhood obesity were the highest among children with a low level of MVPA on both weekdays and weekend (OR 4.67), high among children with a high level of MVPA on weekdays and a low level of MVPA on weekend (OR 1.99) and high among children with a low level of MVPA on weekdays and a high levels of MVPA on weekend (OR 2.20), compared to those with a high level of MVPA on both weekdays and weekend. Similarly, the ORs of childhood obesity were significantly higher among children with a high level of sedentary time on both weekdays and weekend (OR 1.87) compared with those with low levels of sedentary time on both weekdays and weekend. CONCLUSIONS: Lower levels of MVPA or higher levels of sedentary time on either weekdays or weekend were associated with increased odds of obesity in 9-11 year old children in 12 countries.
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