Abstract
 Background: Capoeira has been described as beneficial in several aspects, but one of the possible consequences of its growing popularity is the increased account of musculoskeletal injuries among practitioners. An understanding of Capoeira-related musculoskeletal injuries can help sports physical therapists and other health professionals implement preventive strategies.
 Background: Capoeira has been described as beneficial in several aspects, but one of the possible consequences of its growing popularity is the increased account of musculoskeletal injuries among practitioners. An understanding of Capoeira-related musculoskeletal injuries can help sports physical therapists and other health professionals implement preventive strategies. Objectives: To determine the prevalence of Capoeira-related musculoskeletal injuries and to identify possible associated factors. Methods: This was a cross-sectional study with 520 capoeira practitioners. Survey Web links were emailed to capoeira practitioners associated with specialized groups in Brazil. The Survey collected demographic information, training characteristics and history of Capoeira-related musculoskeletal injuries in the past 12 months. The prevalence of Capoeira-related musculoskeletal injuries was analyzed by descriptive statistics and associated factors by logistic regression models. Results: Most capoeira practitioners (n=411, 79.0%) were men, with a mean age of 29.6±7.6 years old and who trained 3 times a week, over 90 minutes per day, for an average of 13 years of practice. The variable that showed association with Capoeira-related musculoskeletal injuries was weekly training frequency (OR=2.26 95%CI 1.38–3.69). Conclusions: The prevalence of injury was 42.9% (n= 223), and the knee was the most affected joint. The training frequency above 3 times per week was associated with Capoeira-related musculoskeletal injuries.

Individual differences of personality are thought to influence motor performance. In terms of cortical arousal levels, because extraverts are infra-activated and introverts are hyper-activated, environment stimuli might enhance the impact of the extraversion trait on task performance. This study investigated the effect of light and sound noise on the swimming performance of extraverted and introverted children. 19 extraverts (12 boys, 7 girls) and 22 introverts (12 boys, 10 girls), ages 8.2 ± 0.9 years, adapted to water and swimming at intermediate levels. Participants performed two trials of the task (swimming 15 meters as fast as possible in crawl style) under two environment conditions: bright light/loud noise (A) and dim light/slight noise (B). Movements were filmed to allow calculation of time to complete the task and the stroke cycle. There was a significant effect for the group factor, with extraverts swimming faster than introverts. No effect was detected for the environment factor or the interaction group/environment. Regarding stroke cycle, no differences were found for group, environment or interaction. Although extraversion has not affected mechanical aspects of crawl style, compared to introverts, extraverts swan faster, showing a more effective process of reacting and executing movements in time-constraints tasks.