Department of Physical Education, São Paulo State University (UNESP), Presidente Prudente, Brazil.
Bradford Institute for Health Research, Bradford Teaching Hospitals Foundation Trust, Bradford, UK; Department of Health Sciences, University of York, UK.
Gen Hosp Psychiatry. 2019 Jul-Aug;59:7-13. doi: 10.1016/j.genhosppsych.2019.04.010. Epub 2019 May 1.
To examine the relationship between physical activity, sedentary behaviors, and social isolation in a representative sample of Brazilian adolescents.
Cross sectional analyses using data from the Brazilian Scholar Health Survey conducted in 2015. The sample included 100,839 adolescents (mean age: 14.3 y, 51.4% Female) from 3040 schools. Information about social isolation (number of close friends and perceived loneliness), physical activity (International Physical Activity Questionnaire) and sedentary behaviors (total sitting time and TV viewing) were self-reported. Chronological age, race and type of city (state capital or other) were co-variables. Logistic regression models were used to analyze the data (results are presented as odds ratios (OR) with 95% confidence intervals).
Physical activity was associated with lower odds of both social isolation indicators in boys, and with lower likelihood of having few friends in girls. Greater sitting time was associated with higher likelihood of social isolation, as was low (<1 h/d) [boys: OR: 1.54 (95% CI: 1.33 to 1.77); girls: OR: 1.31 (95% CI: 1.17 to 1.48] and high TV viewing (≥8 h/d) [boys: OR: 1.75 (95% CI: 1.47 to 2.09)]; girls: OR: 1.58 (95% CI: 1.37 to 1.82)]. More than 300 min/week of physical activity was sufficient to eliminate the association of high TV viewing and high sitting time with markers of social isolation in boys.
Physical activity is associated with a lower prevalence of social isolation, especially among boys. Both high and low amounts of TV viewing increase the likelihood of social isolation. Physical activity reduced the association between TV viewing and sitting with social isolation among boys.
在巴西青少年的代表性样本中研究身体活动、久坐行为和社会隔离之间的关系。
使用 2015 年巴西学者健康调查的数据进行横断面分析。该样本包括来自 3040 所学校的 100839 名青少年（平均年龄：14.3 岁，51.4%为女性）。社会隔离（亲密朋友的数量和感知孤独感）、身体活动（国际体力活动问卷）和久坐行为（总坐姿时间和看电视时间）的信息均为自我报告。年龄、种族和城市类型（州首府或其他）为协变量。使用逻辑回归模型对数据进行分析（结果表示为 95%置信区间的比值比（OR））。
在男孩中，身体活动与两个社会隔离指标的较低几率相关，与女孩中较少朋友的可能性较低相关。久坐时间较长与社会隔离的可能性增加相关，低（<1 小时/天）[男孩：OR：1.54（95%CI：1.33 至 1.77）；女孩：OR：1.31（95%CI：1.17 至 1.48）]和高（≥8 小时/天）[男孩：OR：1.75（95%CI：1.47 至 2.09）]；女孩：OR：1.58（95%CI：1.37 至 1.82）]和高（≥8 小时/天）[男孩：OR：1.75（95%CI：1.47 至 2.09）]；女孩：OR：1.58（95%CI：1.37 至 1.82）]）观看电视时间较多；每周进行超过 300 分钟的身体活动足以消除男孩中高观看电视时间和高坐姿时间与社会隔离标志物之间的关联。
身体活动与社会隔离的发生率较低相关，尤其是在男孩中。高和低的观看电视时间都增加了社会隔离的可能性。身体活动减少了男孩中观看电视时间和坐姿与社会隔离之间的关联。
