title: Objectively measured physical activity, sedentary time and sleep duration: independent and combined associations with adiposity in canadian children.
abstract: OBJECTIVE
  To examine independent and combined associations among objectively measured movement/non-movement behaviors (moderate-to-vigorous-intensity physical activity (MVPA), total sedentary time and sleep duration) and adiposity indicators in a sample of Canadian children.
  
  
  METHODS
  A cross-sectional study was conducted on 507 children aged 9-11 years from Ottawa, Canada. Movement/non-movement behaviors were assessed using an Actigraph GT3X+ accelerometer over 7 days (24-h protocol). Outcomes included percentage body fat (bioelectrical impedance) and waist-to-height ratio.
  
  
  RESULTS
  After adjustment for age, sex, ethnicity, maturity offset, fast food consumption, annual household income and highest level of parental education, MVPA was inversely and sedentary time positively associated with adiposity indicators, whereas sleep duration was not. However, only MVPA remained significantly associated with adiposity indicators after additional adjustment for the other movement/non-movement behaviors. Combined associations using tertiles of the three movement/non-movement behaviors showed that higher levels of MVPA were associated with lower adiposity indicators, irrespective of total sedentary time and sleep duration.
  
  
  CONCLUSIONS
  Higher levels of MVPA were associated with lower adiposity in this sample of children regardless of sedentary time and sleep duration. Although correlational in nature, these findings suggest that future efforts of obesity reduction should focus more on increasing MVPA than on reducing sedentary time or increasing sleep duration to maximize the effectiveness of interventions.
authors.affiliation: 1] Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada [2] Department of Pediatrics, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: J-P
authors.initials: JP
authors.lastname: Chaput
authors.affiliation: Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Leduc
authors.affiliation: Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.
authors.forename: C
authors.initials: C
authors.lastname: Boyer
authors.affiliation: Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.
authors.forename: P
authors.initials: P
authors.lastname: Bélanger
authors.affiliation: 1] Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada [2] Population Health, Faculty of Graduate and Postdoctoral Studies, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: A G
authors.initials: AG
authors.lastname: LeBlanc
authors.affiliation: 1] Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada [2] School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: M M
authors.initials: MM
authors.lastname: Borghese
authors.affiliation: 1] Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada [2] Department of Pediatrics, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: M S
authors.initials: MS
authors.lastname: Tremblay