title: Are overweight and obese youth at increased risk for physical activity injuries?
abstract: OBJECTIVE
  To determine whether relationships between physical activity and physical activity injuries are modified by BMI status in youth.
  
  
  METHODS
  Data were obtained from the 2006 Canadian Health Behaviour in School-Aged Children survey; a representative study of 7,714 grade 6-10 youth. A sub-sample of 1,814 were re-administered the survey in 2007. Analyses considered relationships among the major variables in theory-driven cross-sectional and longitudinal analyses.
  
  
  RESULTS
  Among normal weight youth, cross-sectional analyses indicated that those who reported high levels of physical activity outside of school experienced 2.28 (95% confidence interval 1.95-2.68) the relative odds for physical activity injury in comparison to those with low levels of physical activity outside of school. Analogous odds ratios for overweight and obese youth were 1.89 (1.31-2.72) and 3.72 (1.89-7.33), respectively. BMI status was not an effect modifier of the relationship between physical activity and physical activity injury. Similar observations were made in the confirmatory longitudinal analyses.
  
  
  CONCLUSIONS
  Concerns surrounding the design of physical activity programmes include side-effects such as injury risk. This study provides some re-assurance that physical activity participation relates to injury in a consistent manner across BMI groups.
authors.affiliation: Department of Community Health and Epidemiology, Queen's University, Kingston, ON, Canada.
authors.forename: Joel
authors.initials: J
authors.lastname: Warsh
authors.forename: William
authors.initials: W
authors.lastname: Pickett
authors.forename: Ian
authors.initials: I
authors.lastname: Janssen
mesh_terms: D000293:Adolescent; D001265:Athletic Injuries / Q000453:epidemiology*; D015992:Body Mass Index; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D009043:Motor Activity; D009765:Obesity / Q000453:epidemiology*; D050177:Overweight / Q000453:epidemiology*; D012307:Risk Factors; D012309:Risk-Taking; D012574:Schools / Q000706:statistics & numerical data
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