Background: The health benefits linked to regular engagement in physical exercise are widely disseminated in the scientific literature. In this context, sport participation has been pointed out as an important factor for maintaining health and well-being, because it is one of the most important manifestations of physical exercise among children and adolescents. Although sport participation is capable to improve health in pediatric groups, the engagement in any sport exposes children and adolescents to a higher risk to sustain a sport injury. Therefore, as the regular engagement in sport participation increases in the population, the number of injuries trend to increase too. With this background, few data is available about sport injuries among pediatric groups and efforts are necessary to understand its burden on adolescents' health and performance. Moreover, gaps in the identification of the outcome constitute a relevant issue, because there are many methods used to identify sport injuries.Objective: I) Create a liable method to measure properly sport injuries in Brazilian adolescents, taking into account the most appropriate methods currently used in the scientific literature; II) Receive support to identify the main correlates of sport injuries that should be monitored during the follow-up period in order to created consistent multivariate models of analysis; III) Write one scientific papers about sport participation and musculoskeletal symptoms in collaboration with the colleagues from EMGO, based on the baseline measures of the ABCD - Growth Study recently collectedMethods: This longitudinal 12 month follow up, involving adolescents aged between 12 and 16 years of both sexes. Minimum sample for the study was estimated to be 231 subjects. Teenagers will be grouped according to their involvement in different sports (Swimming, Rhythmic Gymnastics, Track and field, Baseball, Basketball, Karate, Judo and Kung Fu) and the control groups. The musculoskeletal symptoms will be evaluated by previously validated questionnaire, whereas body composition estimates are made by bone densitometry unit (DXA). Physical activity will be measured by accelerometer and the inflammatory profile (C - reactive protein) by blood samples. Biological maturation is estimated by anthropometric measurements. Expected results: Identify patterns of musculoskeletal symptoms by different sports, as well as to identify the role of variables related to human growth and inflammation in this process.Keywords: Sport injury, sports, growth and adolescents.
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