Validity of the Fitbit activity tracker for measuring steps in community-dwelling older adults.
Validity of the Fitbit activity tracker for measuring steps in community-dwelling older adults.
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DOI：
10.1136/bmjsem-2015-000013
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发表时间：
2015
影响因子：
4.8
通讯作者：
Sherrington C
中科院分区：
文献类型：
--
作者：
Paul SS;Tiedemann A;Hassett LM;Ramsay E;Kirkham C;Chagpar S;Sherrington C
市场上可以买到的活动监测器，如Fitbit，可能会鼓励体力活动。然而，Fitbit在老年人中的准确性仍然不得而知。本研究的目的是在社区老年人中确定(1)Fitbit步数与视觉计数和Actigraph加速度计步数的标准效度，以及(2)Actigraph步数与视觉计数的准确性。32名60岁以上居住在社区的成年人在2 分钟步行测试(2MWT)中同时佩戴Fitbit和Actigraph设备，然后在7天的清醒时间内进行测试。一位理疗师计算了在2MWT期间所走的步数。Fitbit与2MWT的目测步数(组内相关系数ICC2，1=0.88，95%可信区间0.76~0.94)有较好的一致性，Fitbit与Actigraph的一致性好(ICC2，1=0.66，95%CI 0.41~0.82)，Actigraph与目测步数的一致性(ICC2，1=0.60，95%CI 0.33~0.79)。在7个 天数中，Fitbit与Actigraph的平均步数/天有很好的一致性(ICC2，1=0.94，95%CI 0.88~0.97)。与目测计数相比，Fitbit步数的符合率最接近(平均为0%，SD 4%)，而与肌动图相比，Fitbit平均步数/天的符合率最低(平均为13%，SD为25%)。Fitbit准确地跟踪了2MWT期间的步数，但活动图似乎低估了步数。Fitbit和Actigraph Counted Steps之间有很强的一致性。Fitbit跟踪器足够准确，可以在社区老年人中使用，以监测步数并提供反馈。
Commercially available activity monitors, such as the Fitbit, may encourage physical activity. However, the accuracy of the Fitbit in older adults remains unknown. This study aimed to determine (1) the criterion validity of Fitbit step counts compared to visual count and ActiGraph accelerometer step counts and (2) the accuracy of ActiGraph step counts compared to visual count in community-dwelling older people. Thirty-two community-dwelling adults aged over 60 wore Fitbit and ActiGraph devices simultaneously during a 2 min walk test (2MWT) and then during waking hours over a 7-day period. A physiotherapist counted the steps taken during the 2MWT. There was excellent agreement between Fitbit and visually counted steps (intraclass correlation coefficient (ICC2,1)=0.88, 95% CI 0.76 to 0.94) from the 2MWT, and good agreement between Fitbit and ActiGraph (ICC2,1=0.66, 95% CI 0.41 to 0.82), and between ActiGraph and visually counted steps (ICC2,1=0.60, 95% CI 0.33 to 0.79). There was excellent agreement between the Fitbit and ActiGraph in average steps/day over 7 days (ICC2,1=0.94, 95% CI 0.88 to 0.97). Percentage agreement was closest for Fitbit steps compared to visual count (mean 0%, SD 4%) and least for Fitbit average steps/day compared to the ActiGraph (mean 13%, SD 25%). The Fitbit accurately tracked steps during the 2MWT, but the ActiGraph appeared to underestimate steps. There was strong agreement between Fitbit and ActiGraph counted steps. The Fitbit tracker is sufficiently accurate to be used among community-dwelling older adults to monitor and give feedback on step counts.