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首页> 外文期刊>Medicine and science in sports and exercise >Detecting indoor and outdoor environments using the actigraph GT3X+ light sensor in children
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Detecting indoor and outdoor environments using the actigraph GT3X+ light sensor in children

机译：使用Actigraph GT3X +光传感器检测儿童的室内和室外环境

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INTRODUCTION: Experts recommend children spend more time playing outdoors. The ambient light sensor of the ActiGraph GT3X+ provides lux measurements. A lux is the International System's unit of illumination, equivalent to 1 lm·m. Few studies have established a lux threshold for determining whether a child is indoors or outdoors. PURPOSE: This study aimed 1) to assess the reliability of the ActiGraph GT3X+ ambient light sensor, 2) to identify a lux threshold to accurately discriminate between indoor and outdoor activities in children, and 3) to test the accuracy of the lux threshold in a free-living environment. METHODS: In part 1, a series of reliability tests were performed using 20 ActiGraph GT3X+ monitors under different environmental conditions. Cronbach's alpha was used to determine interinstrument reliability. In part 2, 18 children performed 11 different activities (five indoors and six outdoors) for 6 min each. The optimal threshold for detecting indoor/outdoor activity was determined using a receiver operator characteristic curve analysis. In part 3, 18 children at a preschool wore the monitor during a school day. Percent accuracy was determined for all conditions. RESULTS: In part 1, the devices had Cronbach's alpha values of 0.992 and 1.000 for indoor and outdoor conditions, respectively, indicating high interinstrument reliability. In part 2, the optimal lux threshold was determined to be 240 lux (sensitivity = 0.92, specificity = 0.88, area under the curve = 0.96, 95% CI = 0.951-0.970). In part 3, results of the school-day validation demonstrated the monitor was 97.0% accurate for overall detection of indoor and outdoor conditions (outdoor = 88.9%, indoor = 99.1%). CONCLUSIONS: The results demonstrate that an ActiGraph GT3X+ lux threshold of 240 can accurately assess indoor and outdoor conditions of preschool children in a free-living environment.
机译：简介：专家建议孩子们花更多的时间在户外玩。 ActiGraph GT3X +的环境光传感器可提供照度测量。照度是国际系统的照度单位，等于1 lm·m。很少有研究确定照度阈值来确定儿童是在室内还是室外。目的：本研究旨在1）评估ActiGraph GT3X +环境光传感器的可靠性，2）识别照度阈值以准确地区分儿童的室内和室外活动，以及3）在儿童中测试照度阈值的准确性。自由生活的环境。方法：在第1部分中，使用了20台ActiGraph GT3X +显示器在不同的环境条件下进行了一系列可靠性测试。 Cronbach's alpha用于确定仪器间的可靠性。在第2部分中，有18个孩子分别进行了11种不同的活动（五个室内活动和六个室外活动），每次活动6分钟。使用接收器操作员特征曲线分析确定检测室内/室外活动的最佳阈值。在第3部分中，学龄前18名学龄前儿童戴着监视器。确定所有条件下的准确度百分比。结果：在第1部分中，设备在室内和室外条件下的Cronbachα值分别为0.992和1.000，表明仪器间的可靠性很高。在第2部分中，最佳勒克斯阈值确定为240勒克斯（灵敏度= 0.92，特异性= 0.88，曲线下面积= 0.96，95％CI = 0.951-0.970）。在第3部分中，上学日验证的结果表明，该监视器对于室内和室外条件的整体检测准确率为97.0％（室外= 88.9％，室内= 99.1％）。结论：结果表明，ActiGraph GT3X + lux阈值为240可以准确评估自由生活环境中学龄前儿童的室内和室外条件。

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