Atividade física e comportamento sedentário em adolescentes estudantes do ensino médio
Objective: To identify the prevalence of factors associated with insufficient physi- cal activity levels and sedentary behavior among adolescents.Methods: In this cross- sectional study 4,210 students (14-19 years old) attending public high-schools were selected using random two-stage cluster sampling. Data were collected by using the Global School-based Student Health Sur- vey. Subjects who reported performing 60 minutes or more of moderate to vigorous physical activity five days a week or more were classified as physically active, while the remainder was classified as insufficiently active. Subjects who reported watching TV three or more hours a day were considered to be exposed to sedentary behavior. Analy- ses were carried out by using Chi-square tests and binary logistic regression.Results: The prevalence of insufficiently active sub- jects was 65.1% (CI95% 63.7-66.6). Gender, place of residence (rural/urban), time of day attending school, occupational status, and enrollment in physical education were iden- tified as factors significantly associated with exposure to insufficient levels of physical activity. Prevalence of exposure to sedentary behavior was 40.9% (CI95% 39.4-42.4) on week days and 49.9% (CI95% 48.4-51.4) on weekend days. Place of residence, time of day attending school, occupational status and enrollment in physical education were identified as factors significantly associa- ted with exposure to sedentary behavior on week days, whereas on weekend days exposure to sedentary behavior was related to gender, age and time of day attending school. Conclusion: This study showed a high prevalence of insufficient physical activity levels and exposure to sedentary behaviors among adolescents.