PDF(Pubmed)
Abstract：
The purposes were to examine the criterion-related validity of the steps estimated by consumer-wearable activity trackers (wrist-worn activity trackers: Fitbit Ace 2, Garmin Vivofit Jr, and Xiomi Mi Band 5; smartphone applications: Pedometer, Pedometer Pacer Health, and Google Fit/Apple Health) and their comparability in primary schoolchildren under controlled conditions. An initial sample of 66 primary schoolchildren (final sample = 56; 46.4% females), aged 9-12 years old (mean = 10.4 ± 1.0 years), wore three wrist-worn activity trackers (Fitbit Ace 2, Garmin Vivofit Jr 2, and Xiaomi Mi Band 5) on their non-dominant wrist and had three applications in two smartphones (Pedometer, Pedometer Pacer Health, and Google Fit/Apple Health for Android/iOS installed in Samsung Galaxy S20+/iPhone 11 Pro Max) in simulated front trouser pockets. Primary schoolchildren\'s steps estimated by the consumer-wearable activity trackers and the video-based counting independently by two researchers (gold standard) were recorded while they performed a 200-meter course in slow, normal and brisk pace walking, and running conditions. Results showed that the criterion-related validity of the step scores estimated by the three Samsung applications and the Garmin Vivofit Jr 2 were good-excellent in the four walking/running conditions (e.g., MAPE = 0.6-2.3%; lower 95% CI of the ICC = 0.81-0.99), as well as being comparable. However, the Apple applications, Fitbit Ace 2, and Xiaomi Mi Band 5 showed poor criterion-related validity and comparability on some walking/running conditions (e.g., lower 95% CI of the ICC < 0.70). Although, as in real life primary schoolchildren also place their smartphones in other parts (e.g., schoolbags, hands or even somewhere away from the body), the criterion-related validity of the Garmin Vivofit Jr 2 potentially would be considerably higher than that of the Samsung applications. The findings of the present study highlight the potential of the Garmin Vivofit Jr 2 for monitoring primary schoolchildren\'s steps under controlled conditions.
摘要：
目的是检查由消费者可穿戴活动跟踪器估计的步骤的标准相关有效性（手腕穿戴活动跟踪器：FitbitAce2，GarminVivofitJr，和XiomiMiBand5；智能手机应用程序：计步器，计步器起搏器健康，和GoogleFit/AppleHealth）及其在受控条件下的小学生中的可比性。最初的样本为66名小学生（最终样本=56；46.4％的女性），9-12岁（平均=10.4±1.0岁），在他们的非主要手腕上佩戴了三个手腕佩戴的活动跟踪器（FitbitAce2，GarminVivofitJr2和小米MiBand5），并且在两款智能手机中具有三个应用程序（计步器，计步器起搏器健康，和GoogleFit/AppleHealthforAndroid/iOS安装在三星GalaxyS20+/iPhone11ProMax）中的模拟前裤袋中。小学生通过消费者可穿戴活动跟踪器估计的步数和两名研究人员（黄金标准）独立进行的基于视频的计数被记录下来，同时他们缓慢地进行了200米的课程，正常而轻快的步行，和运行条件。结果表明，由三个三星应用程序和GarminVivofitJr2估计的步数与标准相关的有效性在四个步行/跑步条件下都很好（例如，MAPE=0.6-2.3%；ICC的95%CI较低=0.81-0.99），以及具有可比性。然而,苹果的应用程序，FitbitAce2和小米MiBand5在某些步行/跑步条件下显示出与标准相关的有效性和可比性较差（例如，降低ICC的95%CI<0.70)。虽然,就像现实生活中的小学生一样，他们也把智能手机放在其他地方(例如，书包,手甚至远离身体的地方)，GarminVivofitJr2的标准相关有效性可能会比三星应用程序高得多。本研究的发现强调了GarminVivofitJr2在受控条件下监测小学生步骤的潜力。
