Comparison of wrist-worn Fitbit Flex and waist-worn ActiGraph for measuring steps in free-living adults.
Comparison of wrist-worn Fitbit Flex and waist-worn ActiGraph for measuring steps in free-living adults.
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DOI：
10.1371/journal.pone.0172535
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Müller-Riemenschneider F
中科院分区：
文献类型：
--
作者：
Chu AH;Ng SH;Paknezhad M;Gauterin A;Koh D;Brown MS;Müller-Riemenschneider F
加速度计通常用于评估身体活动。消费者活动跟踪器如今越来越受欢迎，例如Fitbit。本研究旨在比较自由生活条件下使用腕戴式Fitbit Flex和腰戴式ActiGraph（wGT 3X-BT）的平均每日步数。要求104名成人参与者（n = 35名男性; n = 69名女性）同时佩戴Fitbit Flex和ActiGraph 7天。每日步数用于分类非活动（<10，000步）和活动（≥ 10，000步）日，这是维持健康的常用体力活动指南之一。评估了ActiGraph和Fitbit Flex的体力活动分类之间的一致性比例。统计分析包括斯皮尔曼rho、组内相关性（ICC）、中位绝对百分比误差（MAPE）、Kappa统计和Bland-Altman图。对所有参与者进行分析，按每个步骤定义的日常体力活动类别和性别进行。Fitbit Flex和ActiGraph记录的中位平均步数/天分别为10193和8812。所有参与者，无论男女，以及日常体力活动类别（斯皮尔曼的rho：0.76-0.91; ICC：0.73-0.87）发现强正相关和协议。MAPE是：总体步数为15.5%（95%置信区间[CI]：5.8-28.1%），男性和女性分别为16.9%（6.8-30.3%）和15.1%（4.5-27.3%），非活动日和活动日分别为20.4%（8.7-35.9%）和9.6%（1.0-18.4%）。Bland-Altman图显示，Fitbit Flex对所有参与者的平均高估为1300步/天。Fitbit Flex和ActiGraph分别将51.5%和37.5%的天数归类为活动天数（Kappa：0.66）。Fitbit Flex和ActiGraph之间的步长具有高度相关性和一致性。然而，研究结果表明器械之间的步骤存在差异。这带来了一个挑战，在研究和健康促进计划中使用Fibit Flex时需要考虑。
Accelerometers are commonly used to assess physical activity. Consumer activity trackers have become increasingly popular today, such as the Fitbit. This study aimed to compare the average number of steps per day using the wrist-worn Fitbit Flex and waist-worn ActiGraph (wGT3X-BT) in free-living conditions. 104 adult participants (n = 35 males; n = 69 females) were asked to wear a Fitbit Flex and an ActiGraph concurrently for 7 days. Daily step counts were used to classify inactive (<10,000 steps) and active (≥10,000 steps) days, which is one of the commonly used physical activity guidelines to maintain health. Proportion of agreement between physical activity categorizations from ActiGraph and Fitbit Flex was assessed. Statistical analyses included Spearman’s rho, intraclass correlation (ICC), median absolute percentage error (MAPE), Kappa statistics, and Bland-Altman plots. Analyses were performed among all participants, by each step-defined daily physical activity category and gender. The median average steps/day recorded by Fitbit Flex and ActiGraph were 10193 and 8812, respectively. Strong positive correlations and agreement were found for all participants, both genders, as well as daily physical activity categories (Spearman's rho: 0.76–0.91; ICC: 0.73–0.87). The MAPE was: 15.5% (95% confidence interval [CI]: 5.8–28.1%) for overall steps, 16.9% (6.8–30.3%) vs. 15.1% (4.5–27.3%) in males and females, and 20.4% (8.7–35.9%) vs. 9.6% (1.0–18.4%) during inactive days and active days. Bland-Altman plot indicated a median overestimation of 1300 steps/day by the Fitbit Flex in all participants. Fitbit Flex and ActiGraph respectively classified 51.5% and 37.5% of the days as active (Kappa: 0.66). There were high correlations and agreement in steps between Fitbit Flex and ActiGraph. However, findings suggested discrepancies in steps between devices. This imposed a challenge that needs to be considered when using Fibit Flex in research and health promotion programs.