INACTIVE BEHAVIOR IN ADOLESCENT STUDENTS OF THE BRAZILIAN WESTERN AMAZON

ABSTRACT Objective: To identify the prevalence of physical inactivity in adolescent students in the city of Porto Velho, RO, Northern Brazil, and its associated factors. Methods: School-based study, conducted with 2,694 adolescents. The self-reported variable for outcome was physical inactivity. Factors associated with inactive behavior were verified by multiple logistic regression. The independent variables were inserted into the model in hierarchical blocks. Results: The overall prevalence of inactive behavior was 39.5%. Females showed a higher prevalence of physical inactivity (46.2%) than males (31.4%). Adolescents in private schools and with reports of negative health perception had a high prevalence of physical inactivity. Regarding associated factors, the female sex showed a magnitude of association of 1.84 with physical inactivity. Being in a private school was associated with a 2.54 times greater chance of physical inactivity compared to public school students. Going to school by bus, car or motorcycle was associated with a 1.29 and 1.63 higher chance of physical inactivity respectively. Adolescents who reported having a negative health perception had 1.29 higher chance of physical inactivity, while having excess body fat showed magnitude of association of 1.36 in adolescents. Conclusions: There was a high prevalence of physical inactivity in the studied adolescents. Considering that the behavior of physical inactivity adopted during adolescence may continue in adulthood, the promotion of actions that can change this behavior may improve health in the future as well as quality of life.摘要 目的：明确巴西北部朗多尼亚州韦柳港市青少年学生身体活动不足的流行率及其相关影响因素。 方法：本研究为基于学校的调查研究，共纳入2694名青少年。以自我报告的身体活动不足作为结局变量，采用将自变量按分层区块纳入模型的多因素logistic回归分析，验证与久坐行为相关的影响因素。 结果：研究对象总体的身体活动不足流行率为39.5%。女性身体活动不足流行率（46.2%）高于男性（31.4%）。就读私立学校以及自我报告健康状况不佳的青少年，其身体活动不足的流行率更高。在关联因素分析中，女性与身体活动不足的关联强度为1.84；就读私立学校的青少年，出现身体活动不足的风险是公立学校学生的2.54倍；乘坐公交、轿车或摩托车上学的青少年，出现身体活动不足的风险分别升高1.29倍和1.63倍；自我报告健康状况不佳的青少年，其身体活动不足风险升高1.29倍；而体脂过高的青少年，其关联强度为1.36。 结论：本研究纳入的青少年群体中，身体活动不足的流行率较高。鉴于青少年时期形成的久坐行为可能延续至成年期，推广可改善此类行为的干预措施，将有助于未来提升人群健康水平与生活质量。