Association between family violence and physical activity in Brazilian adolescents: a quantile regression analysis.

The study aims to assess the association between family physical violence and different domains of physical activity in students. Cross-sectional study with data from the National School Health Survey 2015. Physical activity was measured with a validated questionnaire and comprised the previous seven days.

Environment modification at school to promote physical activity among adolescents: a cluster randomized controlled trial.

Objective: To assess the effect of modifications of the school environment on physical activity in Brazilian adolescent students.

Methods: Seven public schools in Duque de Caxias (Brazil) were randomized into control and intervention groups. The intervention group underwent modifications in the school environment (painting of hopscotch and school courts) and the provision of sports equipment (balls, basketball table, soccer goalpost, volleyball nets, and others) to stimulate physical activity.

Effectiveness of a school-based randomized controlled trial aimed at increasing physical activity time in adolescents.

Background: This study aimed to evaluate the effectiveness of obesity prevention educational activities, isolated or combined with the modification of the school environment on total physical activity time.

Methods: This is a school-based randomized controlled trial, conducted with 2511 students from fifth and sixth-grade in Brazil, that employed a parallel, three-group experimental arms: control group (CG), PAAPPAS group (PG) and PAAPPAS-environment group (PEG). During the 2016 school year, the PG received educational activities in the classroom, providing a general basis for a healthy lifestyle.