title: Independent mobility and its relationship with moderate-to-vigorous physical activity in middle-school Portuguese boys and girls.
abstract: BACKGROUND
  The exact relation between objectively measured moderate-to-vigorous physical activity (MVPA) and independent mobility in children has yet to be fully defined. The objective of this study was to determine whether independent mobility is associated with level of MVPA.
  
  
  METHODS
  Data were collected from 9 middle schools in Porto (Portugal) area. A total of 636 children in the 6th grade (340 girls and 296 boys) with a mean age of 11.64 years old participated in the study. PA was measured in 636 participants using an accelerometer. Multinomial logistic regression was applied to assess the odds for belonging to quartiles of MVPA.
  
  
  RESULTS
  After controlling for age, gender, body mass index, meeting PA recommendations, and participation in structured exercise, the odds of having a higher level of MVPA when children have higher independent mobility increase through the MVPA quartiles.
  
  
  CONCLUSIONS
  A positive associations were found between independent mobility and quartiles of physical activity.
authors.affiliation: Research Centre in Physical Activity, Health and Leisure (CIAFEL), Faculty of Sport, University of Porto, Porto, Portugal.
authors.forename: Elisa A
authors.initials: EA
authors.lastname: Marques
authors.forename: Andreia Isabel
authors.initials: AI
authors.lastname: Pizarro
authors.forename: Jorge
authors.initials: J
authors.lastname: Mota
authors.forename: Maria Paula
authors.initials: MP
authors.lastname: Santos
mesh_terms: D061725:Accelerometry; D000203:Activities of Daily Living; D015992:Body Mass Index; D002648:Child; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000517:prevention & control*; D011174:Portugal; D012574:Schools