Walk this way: validity evidence of iphone health application step count in laboratory and free-living conditions
Walk this way: validity evidence of iphone health application step count in laboratory and free-living conditions
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DOI：
10.1080/02640414.2017.1409855
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发表时间：
2018-01-01
影响因子：
3.4
通讯作者：
Faulkner, Guy
中科院分区：
文献类型：
--
作者：
Duncan, Markus J.;Wunderlich, Kelly;Faulkner, Guy
已经进行了几次尝试，以证明iPhone计步器功能在实验室测试条件下的准确性。然而，没有研究试图评估iPhone步骤计数作为该领域监督工具的收敛有效性的证据。这项研究采取了一种务实的方法来评估健康应用程序导出的iPhone步数，方法是在实验室条件下测量标准化标准iPhone SE和参与者拥有的iPhone（6或更新版本）的异质样本的准确性，以及在自由生活测试中将个人iPhone与加速计导出的步数进行比较。在实验室测试中，当在跑步机上以5 km/h、7.5km/h和10 km/h的速度行走时，标准和个人iPhone与手动计数的步数的平均偏差小于+/- 5%，这通常被认为是计步器可以接受的。在自由生活条件下，当在观察日之间取平均值时，步数差异的平均偏倚为21.5%或1340步/天。研究人员在考虑使用iPhone型号作为研究级计步器进行身体活动监测或评估时应谨慎，这可能是由于参与者不经常携带iPhone;如果合规性可以最大化，那么iPhone可能是合适的。
Several attempts have been made to demonstrate the accuracy of the iPhone pedometer function in laboratory test conditions. However, no studies have attempted to evaluate evidence of convergent validity of the iPhone step counts as a surveillance tool in the field. This study takes a pragmatic approach to evaluating Health application derived iPhone step counts by measuring accuracy of a standardized criterion iPhone SE and a heterogeneous sample of participant owned iPhones (6 or newer) in a laboratory condition, as well as comparing personal iPhones to accelerometer derived steps in a free-living test. During lab tests, criterion and personal iPhones differed from manually counted steps by a mean bias of less than +/- 5% when walking at 5km/h, 7.5km/h and 10km/h on a treadmill, which is generally considered acceptable for pedometers. In the free-living condition steps differed by a mean bias of 21.5% or 1340 steps/day when averaged across observation days. Researchers should be cautioned in considering the use of iPhone models as a research grade pedometer for physical activity surveillance or evaluation, likely due to the iPhone not being continually carried by participants; if compliance can be maximized then the iPhone might be suitable.