Department of Work and Social Psychology, Faculty of Psychology and Neuroscience, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands.
Department of Human Biology, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands.
Sensors (Basel). 2018 Mar 15;18(3):877. doi: 10.3390/s18030877.
Sedentary behavior (SB) has detrimental consequences and cannot be compensated for through moderate-to-vigorous physical activity (PA). In order to understand and mitigate SB, tools for measuring and monitoring SB are essential. While current direct-to-customer wearables focus on PA, the VitaBit validated in this study was developed to focus on SB. It was tested in a laboratory and in a free-living condition, comparing it to direct observation and to a current best-practice device, the ActiGraph, on a minute-by-minute basis. In the laboratory, the VitaBit yielded specificity and negative predictive rates (NPR) of above 91.2% for sitting and standing, while sensitivity and precision ranged from 74.6% to 85.7%. For walking, all performance values exceeded 97.3%. In the free-living condition, the device revealed performance of over 72.6% for sitting with the ActiGraph as criterion. While sensitivity and precision for standing and walking ranged from 48.2% to 68.7%, specificity and NPR exceeded 83.9%. According to the laboratory findings, high performance for sitting, standing, and walking makes the VitaBit eligible for SB monitoring. As the results are not transferrable to daily life activities, a direct observation study in a free-living setting is recommended.
久坐行为（SB）会产生有害后果，且无法通过中等到剧烈的身体活动（PA）来弥补。为了理解和减轻 SB，测量和监测 SB 的工具是必不可少的。虽然目前面向消费者的可穿戴设备主要关注 PA，但本研究中验证的 VitaBit 是为专注于 SB 而开发的。它在实验室和自由生活条件下进行了测试，与直接观察和目前的最佳实践设备 ActiGraph 进行了每分钟的比较。在实验室中，VitaBit 在坐姿和站姿方面的特异性和阴性预测率（NPR）均高于 91.2%，而灵敏度和精度范围在 74.6%至 85.7%之间。对于步行，所有性能值均超过 97.3%。在自由生活条件下，该设备显示与 ActiGraph 作为标准相比，坐姿的性能超过 72.6%。虽然站立和行走的灵敏度和精度范围在 48.2%至 68.7%之间，但特异性和 NPR 超过 83.9%。根据实验室的研究结果，VitaBit 在坐姿、站姿和步行方面的高性能使其适合 SB 监测。由于结果不能转移到日常生活活动中，因此建议在自由生活环境中进行直接观察研究。
