基于成分等时替代模型的高中生身体活动与焦虑症状相关性分析

目的 了解高中生在居家网课期间身体活动、焦虑症状状况及其相关性，为高中生的身心健康干预提供科学依据。方法 2020年4月，某校高中生以问卷星形式完成在线调查，内容包括:一般资料、生活作息、身体活动、焦虑自评量表。采用成分等时替代模型分析高中生24 h行为活动（包括身体活动、静坐行为和睡眠）与焦虑症状的相关性。结果 共调查1 324人，高中生焦虑症状患病率为23.34%。10 min中高强度身体活动（MVPA）替代久坐行为（SB）、低强度身体活动（LPA）与焦虑得分减少相关有统计学意义（平均变化量分别为 - 0.25（95%CI: - 0.47～ - 0.04）、 - 0.24（95%CI : - 0.46～ - 0.02））。随着 MVPA 替代 LPA、SB和睡眠（SLP）的时间增加，焦虑得分预测值减少量增加。结论 高中生居家网课期间焦虑情绪不容忽视，进行中高强度身体活动能有效预防焦虑症状发生。

Correlation analysis between physical activity and anxiety in high school students based on compositional isotemporal substitution model

To investigate the correlation between physical activity and anxiety of high school students during theCOVID-19 epidemic, and to provide scientific basis for the psychological intervention of high school students. Methods InApril 2020, high school students in a school completed an online survey using the Questionnaire Star. General information,daily routine, physical activity, and anxiety self-assessment scale were collected. A component isochronous substitution modelwas used to analyze the correlation between 24-hour behavioral activities including physical activity, sedentary behavior, andsleep and anxiety symptoms in high school students. Results A total of 1 324 individuals were investigated, and theprevalence of anxiety symptoms among high school students was 23.34%. Ten minutes medium- to high-intensity physicalactivity (MVPA) instead of sedentary behavior (SB) and low -intensity physical activity (LPA) were associated with thereduction in anxiety scores mean changes of -0.25 (95% CI: -0.47 to -0.04), -0.24 (95% CI: -0.46 to -0.02)]. The decreasein predicted anxiety scores increased as the duration of MVPA substitution for LPA, SB and (sleep) SLP increased.Conclusion High school students’ anxiety during home-based online classes should not be neglected, and doing moderateto-vigorous physical activity can effectively prevent anxiety symptoms