title: Physical Activity-Related Injury Profile in Children and Adolescents According to Their Age, Maturation, and Level of Sports Participation.
abstract: BACKGROUND
  Physical activity (PA) is beneficial, enhancing healthy development. However, one-third of school-age children practicing sports regularly suffer from an injury. These injuries are associated with sex, chronological age, and PA level.
  
  
  OBJECTIVE
  To identify the importance of age, PA level, and maturity as predictors of injury in Portuguese youth.
  
  
  METHODS
  Descriptive epidemiological study.
  
  
  METHODS
  Level 3.
  
  
  METHODS
  Information about injury and PA level was assessed via 2 questionnaires (LESADO RAPIL II) from 647 subjects aged 10 to 17 years. Maturity offset according to Mirwald (time before or after peak height velocity) and Tanner-Whitehouse III bone age estimates were used to evaluate maturation. Binary logistic regression and gamma regression were used to determine significant predictors of injury and injury rate.
  
  
  RESULTS
  Injury occurrence was higher for both sexes in recreational, school, and federated athletes (athletes engaged in sports that are regulated by their respective federations, with formal competition). These injuries also increased with age in boys and in the higher maturity offset group in girls. Injury rate was higher for both sexes in the no sports participation group. Early-maturing girls, with higher bone age and lower maturity offset, showed higher injury rate.
  
  
  CONCLUSIONS
  Injuries in Portuguese youth were related to PA level, age, and biological maturation. Recreational, school, and federated athletes had more injury ocurrences while subjects with no sports participation had higher injury risk. Older subjects had more injuries. Early-maturing girls that had just passed peak height velocity may be particularly vulnerable to risk of sports injury because of the growing process.
  
  
  CONCLUSIONS
  Increased knowledge about injury with specific PA exposure data is important to an overall risk management strategy. This study has deepened the association between injury and biological maturation variables.
authors.affiliation: Faculty of Human Kinetics, University of Lisbon, Portugal.|CIPER, Faculty of Human Kinetics, University of Lisbon, Portugal.
authors.forename: Lara
authors.initials: L
authors.lastname: Costa E Silva
authors.affiliation: Faculty of Human Kinetics, University of Lisbon, Portugal.|CIPER, Faculty of Human Kinetics, University of Lisbon, Portugal.
authors.forename: Maria Isabel
authors.initials: MI
authors.lastname: Fragoso
authors.affiliation: Faculty of Human Kinetics, University of Lisbon, Portugal.|CIPER, Faculty of Human Kinetics, University of Lisbon, Portugal.
authors.forename: Júlia
authors.initials: J
authors.lastname: Teles
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001265:Athletic Injuries / Q000453:epidemiology*; D002648:Child; D016021:Epidemiologic Studies; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D011174:Portugal / Q000453:epidemiology; D012737:Sex Factors; D012741:Sexual Maturation
keywords: adolescents; bone age; children; injuries; peak height velocity; physical activity level