• David Fecteau, Jocelyn Gravel, Antonio D'Angelo, Elise Martin, and Devendra Amre.
• Division of Pediatrics, Université de Montréal, Montréal, Québec, Canada.
• Clin J Sport Med. 2008 Sep 1; 18 (5): 410-4.

BackgroundThe trend in pediatric sport organizations is to regroup activities into tournaments. Sports-related injuries in children are a public concern.ObjectiveTo evaluate the association between sport injuries and consolidation of physical activity in children.DesignA case-crossover study.SettingThe emergency department of a tertiary care hospital for approximately 1 year in 2006.ParticipantsEligible participants had to be between 8 to 16 years of age, presenting to the emergency department for an acute injury that occurred during a timed organized sport event.Assessment Of Risk FactorsA standardized questionnaire was used to evaluate the number of hours of organized physical activity, which was defined as a supervised exercise leading to competitions. The number of hours of activity was compared between case periods (48 hours and 7 days) and control periods of same length.Main Outcome MeasurementsAn injury was defined as any acute problem with organic tissue that occurred during a sport.ResultsOn average, participants performed 136 minutes of organized sport activity in the 48 hours preceding the injury for a mean difference of 8 +/- 18 min. They also performed 356 minutes of organized sports in the 7 days prior the injury. This represented an increase of 40 +/- 31 minutes compared to the control periods.ConclusionsMore injuries were observed if the athletes had increased the concentration of activity in the 7 days prior. Although small, this difference reflected a minor clinical effect. In our study, we failed to disclose an association for the period of 48 hours.

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