Validity of Fitbit's active minutes as compared with a research-grade accelerometer and self-reported measures.
Validity of Fitbit's active minutes as compared with a research-grade accelerometer and self-reported measures.
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DOI：
10.1136/bmjsem-2017-000254
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发表时间：
2017
影响因子：
4.8
通讯作者：
Ortiz A
中科院分区：
文献类型：
--
作者：
Brewer W;Swanson BT;Ortiz A
该研究的主要目的是评估 Fitbit 和 ActiGraph GT3X+ 加速度计之间的有效性。具体目标是确定：(1) Fitbit 和 GTX3+ 加速计的各种型号之间的并发有效性作为标准测量：单日和 7 天内的平均步数和活跃分钟数； (2) 两台设备与国际体能活动问卷 (IPAQ) 的每日活跃分钟数的有效性。 53 名受试者同时佩戴 Fitbit 和 ActiGraph 7 天。使用相关系数、t 检验来分析数据以评估平均值比较，并使用 Bland-Altman 图来确定 Fitbit 和 ActiGraph 之间的一致性。 Fitbit 和 ActiGraph 每天步数和每 7 天步数之间的相关性分别为 r=0.862 和 0.820，两种设备之间的平均差异显着。 Bland-Altman 分析显示，Fitbit 和 ActiGraph 之间仅在 7 天活跃分钟数方面存在一致性。 Fitbit 和 ActiGraph 每天和每 7 天的活跃分钟数之间的相关性分别为 r=0.695 和 r=0.658，两种设备之间没有显着的平均差异。 IPAQ 和其他两个设备之间没有发现显着的相关性。当比较每个设备在 1 天和 7 天时间段内的平均值时，Fitbit 生成的数据与 ActiGraph 一致。然而，Bland-Altman 分析显示，当仅用于测量 7 天内的身体活动水平时，Fitbit 与 ActiGraph 一致。
The main purpose of the study was to assess the validity between the Fitbit and ActiGraph GT3X+ accelerometer. The specific aims were to determine the: (1) concurrent validity between the various models of the Fitbit and the GTX3+ accelerometer as the criterion measure for: number of steps and active minutes averaged over a single-day and 7-day period; (2) validity of the two devices with the International Physical Activity Questionnaire (IPAQ) for the number of daily active minutes performed. Fifty-three subjects wore a Fitbit and ActiGraph concurrently for 7 days. Data were analysed using correlation coefficients, t-tests to assess mean comparisons and Bland-Altman plots to determine agreement between the Fitbit and the ActiGraph. The correlations between the Fitbit and ActiGraph for steps per day and per 7 days were r=0.862 and 0.820, respectively with significant mean differences between both devices. Bland-Altman analyses revealed agreement between the Fitbit and the ActiGraph for 7-day active minutes only. The correlations between the Fitbit and ActiGraph for active minutes per day and per 7 days were r=0.695 and r=0.658, respectively, with no significant mean differences between both devices. No significant correlations were found between the IPAQ and the other two devices. The data produced by the Fitbit were consistent with the ActiGraph when the means of each device were compared over the 1-day and 7-day time periods. However, Bland-Altman analyses revealed that the Fitbit agreed with the ActiGraph when used to measure physical activity levels over a 7-day span only.