O objetivo deste estudo foi analisar a associação entre diferentes tipos e fontes de apoio social com a prática de atividade física exercida de adolescentes de Curitiba, Paraná, Brasil. Um inquérito de base escolar foi realizado com amostra representativa de adolescentes da rede pública de ensino (n = 1.469). Modelos de regressão múltipla foram utilizados para testar a associação entre a frequência semanal de apoio social recebido da família e dos amigos com a prática de atividade física. Entre os meninos, a companhia frequente da família (RP: 2,88; IC95%: 2,00-4,13) e a dos amigos (RP: 5,46; IC95%: 2,33-12,78), além do reforço positivo destes (RP: 1,81; IC95%: 1,18-2,77), apresentaram associação positiva com a atividade física. O convite esporádico da família apresentou associação negativa (RP: 0,66; IC95%: 0,46-1,14). Para as meninas, a companhia frequente da família (RP: 3,39; IC95%: 1,49-7,69) e a dos amigos (RP: 4,06; IC95%: 2,22-7,45) aumentam a probabilidade da realização de atividade física. Conclui-se que a companhia dos amigos é o tipo de apoio social mais importante para a prática de atividade física de adolescentes.

The school represents an space with opportunities for physical activity (PA) practice in children and adolescents. However, there is still limited evidence on local strategies, structures and policies for PA in the school environment in Brazil. The aim of the study was to identify PA opportunities in public and private schools in Curitiba, Brazil. A total of one hundred sixty one schools were identified from a household survey conducted with adolescents from Curitiba, Brazil from which 107 (72.6% publics) participated in this study. One physical education teacher from each participant school was interviewed. Nearly all schools offered two weekly PE classes (97.1%), lengthing 45 to 50 minutes (95.7%). PE annual training was more frequent among public schools (92.9%). Most schools offered one recess interval (92.3%). However, recess interval of 16-30 minutes (75.0%), supervised (65.6%) and with PA equipment (65.6%) were more frequent among private schools. After school activities were offered in eight out of ten schools, and PA opportunities in other contexts were more frequent in private schools (40.0% vs. 14.3%, p = 0.003). However, more public schools participated in state sponsored programs (57.6% versus 31.2%, p = 0.011). Opportunities for PA in the investigated schools is offering by insufficient frequency and length for promoting PA at the recommended levels in this context.

ABSTRACT:Objective: To analyze the association between perceptions of neighborhood safety (PNS) and screen time among adolescents and to assess the moderating effects of sex, age and socioeconomic status. Methods: A cross-sectional study with school survey was conducted in Curitiba, Brazil. First, six schools (three public and three private) were intentionally selected. Next, one class within each educational level (from the sixth year of elementary school to the third year of high school) was randomly selected. PNS was assessed using a NEWS-Y scale, and daily screen time was defined as the time spent watching TV/videos/ DVDs, playing video games and using the Internet. Multinomial logistic regression models were used to test the association between PNS and screen time, adjusting for the confounding variables. Results: The sample included 776 adolescents (boys and girls), aged between 11 and 18 years old. Perceived crime was associated with time playing video games among older teenagers (p < 0.05). Pedestrian and traffic safety was inversely associated with time playing video games among adolescents with high socioeconomic status (p < 0.05). Conclusion:The association between PNS and screen time is complex among adolescents and varies according to sociodemographic variables and the screen time outcome (TV/videos/DVDs, video games and the Internet).