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目的本研究使用加速度计对儿童的日常体力活动进行评估,建立北京市5~6岁儿童不同体力活动强度的分界值。方法在北京市幼儿园及小学选取5~6岁儿童60名(男30名,女30名)。受试儿童依次完成看动画、慢走、快走、跑步以及自由活动等项目,使用Actigraph GT9X加速度计以及Polar H6心率带记录儿童测试过程中的加速度值以及心率,通过ROC曲线对分界值进行校准,并使用儿童活动评级量表(CARS)对自由活动进行编码,对结果进行验证。结果1)共60名受试儿童参加测试,最终得到56例有效数据。平均年龄为(6.1±0.6)岁,BMI的中位数(四分位数)为15.2(14.4,16.0)kg/m2。2)体力活动静态、轻、中、剧烈强度分界值分别为0~116、117~780、781~1 005和≥1 006次/15s;3)使用ROC曲线分析在强度水平的灵敏度分别为100.0%、85.4%、和98.2%,特异度分别为100.0%、86.5%和98.0%;4)与CARS观察法的编码结果进行一致性检验,κ值=0.71。结论本研究建立的5~6岁儿童体力活动强度加速度分界值,操作简单易行,为5~6岁儿童的日常体力活动进行检测和评估提供了一种新的手段。
OBJECTIVE: This study used the accelerometer to evaluate children’s daily physical activity and established the cut-off value of physical activity intensity of children aged 5 ~ 6 years in Beijing. Methods Sixty children aged 5-6 years old (30 males and 30 females) were selected from kindergartens and elementary schools in Beijing. The children under test completed the animation, walking, walking, running and free-running activities. The Actigraph GT9X accelerometer and the Polar H6 heart rate zone were used to record the acceleration values and heart rate during child testing. The demarcation value was calibrated by ROC curve. The free activity was coded using the Children’s Activity Rating Scale (CARS) to validate the results. Results 1) A total of 60 children participated in the test, and finally got 56 valid data. The average age was (6.1 ± 0.6) years old and the median (quartile) of BMI was 15.2 (14.4,16.0) kg / m2.2) The static, light, moderate and severe intensity of physical activity were 0 ~ 116,117 ~ 780,781 ~ 1,005 and ≥1,006 times / 15s; 3) The sensitivity at intensity level using ROC curve analysis was 100.0%, 85.4%, and 98.2% respectively, and the specificity was 100.0%, 86.5% And 98.0%, respectively; 4) Consistency test was carried out with the result of CARS observation, κ value = 0.71. Conclusion This study establishes a cut-off value of acceleration of physical activity for children aged 5 ~ 6 years. It is easy to operate and provides a new measure for the detection and assessment of daily physical activity of children aged 5 ~ 6 years.