How valid are wearable physical activity trackers for measuring steps?
How valid are wearable physical activity trackers for measuring steps?
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DOI：
10.1080/17461391.2016.1255261
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发表时间：
2017-04-01
影响因子：
3.2
通讯作者：
Lee, Jung-Min
中科院分区：
文献类型：
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作者：
An, Hyun-Sung;Jones, Gregory C.;Lee, Jung-Min
可穿戴活动追踪器在追踪个人日常身体活动方面已变得流行，但几乎没有信息可以证实这些设备在步数计数方面的有效性。 35 名健康个体完成了活动追踪器测量的三种条件：在跑步机上行走/慢跑、在室内跑道上行走以及 24 小时自由生活条件。参与者在跑步机和地面协议中同时佩戴 10 个活动追踪器。这 10 个活动追踪器中，有 3 个被随机分配为 24 小时自由生活状态。在跑步机和地面协议上，测量的步数与观察到的步数的相关性分别为 r=0.84 和 r=0.67。所有设备和跑步机速度的平均 MAPE（平均绝对百分比误差）得分与手动计算的步数相比为 8.2%。就步数而言，地面行走的 MAPE 值较高（9.9%），24 小时自由生活期间的 MAPE 值甚至更高（18.48%）。步数测量的等效性测试结果表明，Fitbit Zip、Withings Pulse 和 Jawbone UP24 的显着水平在 +/- 5% 之内，Basis B1 手环、Garmin VivoFit 和 SenseWear Armband Mini 的显着水平在 +/- 10% 之内。结果表明，Fitbit Zip 和 Withings Pulse 在所有三种不同条件（即跑步机、地上和 24 小时条件）下提供了最准确的步数测量结果，并且不同显示器以及速度和条件的准确度存在很大差异。
Wearable activity trackers have become popular for tracking individual's daily physical activity, but little information is available to substantiate the validity of these devices in step counts. Thirty-five healthy individuals completed three conditions of activity tracker measurement: walking/jogging on a treadmill, walking over-ground on an indoor track, and a 24-hour free-living condition. Participants wore 10 activity trackers at the same time for both treadmill and over-ground protocol. Of these 10 activity trackers three were randomly given for 24-hour free-living condition. Correlations of steps measured to steps observed were r=0.84 and r=0.67 on a treadmill and over-ground protocol, respectively. The mean MAPE (mean absolute percentage error) score for all devices and speeds on a treadmill was 8.2% against manually counted steps. The MAPE value was higher for over-ground walking (9.9%) and even higher for the 24-hour free-living period (18.48%) on step counts. Equivalence testing for step count measurement resulted in a significant level within +/- 5% for the Fitbit Zip, Withings Pulse, and Jawbone UP24 and within +/- 10% for the Basis B1 band, Garmin VivoFit, and SenseWear Armband Mini. The results show that the Fitbit Zip and Withings Pulse provided the most accurate measures of step count under all three different conditions (i.e. treadmill, over-ground, and 24-hour condition), and considerable variability in accuracy across monitors and also by speeds and conditions.