title: [Physical activity and sedentary behavior among adolescent high school students].
abstract: OBJECTIVE
  To identify the prevalence of factors associated with insufficient physical 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 Survey. 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. Analyses were carried out by using Chi-square tests and binary logistic regression.
  
  
  RESULTS
  The prevalence of insufficiently active subjects 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 identified 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 associated 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.
  
  
  CONCLUSIONS
  This study showed a high prevalence of insufficient physical activity levels and exposure to sedentary behaviors among adolescents.
authors.affiliation: Programa de Pós-graduação em Hebiatri, Universidade de Pernambuco. mariaceciliatenorio@gmail.com
authors.forename: Maria Cecília Marinho
authors.initials: MC
authors.lastname: Tenório
authors.forename: Mauro Virgilio Gomes de
authors.initials: MV
authors.lastname: Barros
authors.forename: Rafael Miranda
authors.initials: RM
authors.lastname: Tassitano
authors.forename: Jorge
authors.initials: J
authors.lastname: Bezerra
authors.forename: Juliana Marinho
authors.initials: JM
authors.lastname: Tenório
authors.forename: Pedro Curi
authors.initials: PC
authors.lastname: Hallal
mesh_terms: D000293:Adolescent; D003430:Cross-Sectional Studies; D005260:Female; D015438:Health Behavior; D006801:Humans; D008297:Male; D009043:Motor Activity; D057185:Sedentary Behavior; D055815:Young Adult