title: Physical inactivity is a risk factor for physical activity-related injuries in children.
abstract: OBJECTIVE
  To describe the risk factors associated with injuries resulting from physical education (PE), leisure time physical activity (leisure time PA) and sports in 9-12-year-old children.
  
  
  METHODS
  Prospective cohort study.
  
  
  METHODS
  Primary schools.
  
  
  METHODS
  Nine hundred and ninety-five children aged 9-12 years.
  
  
  METHODS
  Injuries occurring during either PE class, leisure time PA or sports, and caused the child to at least stop the current activity were recorded prospectively. Individual weekly exposure was estimated from baseline and follow-up questionnaires. Potential risk factors were gender, age, socioeconomic status, ethnicity, habitual level of PA, body mass index and a motor fitness. A multivariate Cox proportional hazard regression model was developed, accounting for clustering within schools.
  
  
  RESULTS
  Gender, age and level of PA were independent significant risk factors for injury. Different modalities of PA had different injury risk factors. Most importantly, the low levels of habitual PA significantly increased injury risk.
  
  
  CONCLUSIONS
  The children at highest injury risk are the target audience of the contemporary PA promotion efforts. PA promotion should also focus on injury prevention.
authors.affiliation: Department of Traumasurgery, VU University Medical Center, Amsterdam, The Netherlands.
authors.forename: Frank
authors.initials: F
authors.lastname: Bloemers
authors.forename: Dorine
authors.initials: D
authors.lastname: Collard
authors.forename: Mai Chin A
authors.initials: MC
authors.lastname: Paw
authors.forename: Willem
authors.initials: W
authors.lastname: Van Mechelen
authors.forename: Jos
authors.initials: J
authors.lastname: Twisk
authors.forename: Evert
authors.initials: E
authors.lastname: Verhagen
mesh_terms: D001265:Athletic Injuries / Q000453:epidemiology / Q000209:etiology*; D002648:Child; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D007899:Leisure Activities; D008297:Male; D009426:Netherlands / Q000453:epidemiology; D010806:Physical Education and Training / Q000706:statistics & numerical data*; D011446:Prospective Studies; D012307:Risk Factors; D057185:Sedentary Behavior; D013223:Statistics as Topic