This study investigated the association among loneliness, number of friends, and participation in physical education classes, leisure-time physical activities, and active commuting. Data from 102,072 adolescents participating in the National School–based Health Survey aged 11–19 years were analyzed. Information about the study variables was self-reported through a questionnaire. Adolescents more active in physical education classes and leisure were less likely of having social isolation. Those more active in commuting were more likely of having social isolation. Interventions aimed at addressing social isolation in adolescence can prioritize school and leisure-time physical activities.

The aim of this study was to identify evidence regarding associations between School Physical Activity (PA) and Mental Health (MH) in Brazilian school-aged adolescents. This is a systematic review study. Studies were selected in Portuguese and English and identified by a systematic search in six electronic databases: PubMed, Web of Science, SPORTDiscus / Ebsco, ScIELO, ERIC, and LILACS, which comprised publications until 2019. Inclusion criteria were: studies with cohort, descriptive, cross-sectional or qualitative design; performed with children and adolescents; studies that analyzed the relationship between PA and MH; studies that investigated adolescents who practiced PA in schools; studies carried out in Brazil; and studies that reached minimum of 60% of methodological quality criteria according to STROBE. Physical education, as curricular activity in basic education, has protective effect on MH in the school setting. In addition, more than 300 min/week of PA was positively associated with MH; while associations between PA and excessive TV time; social isolation; and body weight dissatisfaction were negatively associated. School PA is positively associated with MH as it promotes physical and psychological well-being, impacting on the reduction of insomnia rates, attenuating loneliness and improving physical appearance.

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O presente estudo tem como objetivo avaliar a associação entre o comportamento do bullying, variáveis sociodemográficas e a atividade física acumulada em adolescentes escolarizados brasileiros. Trata-se de um estudo com dados secundários, utilizando dados da Amostra 2, da PeNSE 2015 (n = 10926). Para a análise de dados foi utilizada a regressão logística binária para estimar a chance de ocorrência do fenômeno do bullying na forma de Odds Ratio (OR) bruta e ajustada. Para a verificação dos fatores associados ao bullying em adolescentes brasileiros a amostra foi estratificada em “ativos” e “insuficientemente ativos”, de forma a entender o comportamento do bullying entre cada estrato. Observou-se que o sexo masculino apresentou duas vezes mais chances (OR = 1,99; IC95% 1,80 – 2,19) de apresentar este comportamento de bullying quando comparado com o sexo feminino. Verificou-se para o estrato “ativos”, associação entre perpetrar bullying e o sexo masculino (OR = 2,21; IC95% 1,82 - 2,67) e sofrer bullying enquanto auto percepção (OR = 2,45; IC95% 2,05 - 2,93). Para os “insuficientemente ativos”, percebeu-se associação no modelo ajustado entre “perpetrar bullying” e sexo masculino (OR = 1,88; IC95% 1,65 - 2,13). Notou-se que os adolescentes do sexo masculino, que sofriam bullying, tinham mais chance de praticar bullying. Os resultados sugerem ainda que, tanto no grupo “ativo” quanto no grupo de “insuficientemente ativo”, quem perpetra bullying tem mais chance de ter sofrido bullying, sugerindo que o comportamento do bullying é anterior à prática de atividade física.