Liu Jiaxing, Wong Wing To, Zwetsloot Inez Maria, Hsu Yu Cheng, Tsui Kwok Leung
Department of Systems Engineering and Engineering Management, City University of Hong Kong, Kowloon, Hong Kong.
Telemed J E Health. 2019 Dec;25(12):1189-1197. doi: 10.1089/tmj.2018.0202. Epub 2019 Jan 2.
Background:Sleep is related to various kinds of health outcomes. Many studies traditionally collect data on sleep using questionnaires or sleep diaries. An increasing popular alternative is a wrist-worn device. The accuracy of these devices is uncertain, and assessment of this accuracy is important.
Introduction:The purpose of this study is to compare consensus sleep diary (CSD) and an actigraphy-based wrist-worn device (Fitbit Alta™ [Fitbit, San Francisco, CA]) measurements of total sleep time (TST), sleep onset latency, wake time after sleep onset, number of awakenings, and sleep efficiency.
Materials and Methods:Ten healthy young adults (50% female, 100% Asian) in the age range between 20 to 24 years old wore a Fitbit Alta around their nondominated hand during seven consecutive nights. The participants also filled in a CSD every day.
Results:On average, the wrist-worn device (Fitbit Alta) recorded a TST per night of 437.15 min, which is 5.46 min shorter on average than the CSD recorded (442.61 min). Bland-Altman plots indicate that there is large variance in the sleep recorded between Fitbit™ (Fitbit, San Francisco, CA) and CSD. For example, Fitbit recorded 2.15 more awakenings per night than CSD, which is equal to 13.09 min on average longer wake time after sleep onset.
Conclusion:Fitbit and CSD show significant differences in recording sleep. We find that for most sleep metrics, the level of disagreement is small enough for the devices to be interchangeably used except for recording wakes during the night.
睡眠与多种健康结果相关。传统上，许多研究使用问卷或睡眠日记来收集睡眠数据。一种越来越流行的替代方法是佩戴在手腕上的设备。这些设备的准确性尚不确定，因此评估其准确性很重要。
本研究的目的是比较共识睡眠日记（CSD）和基于活动记录仪的腕戴设备（Fitbit Alta™[Fitbit，旧金山，加利福尼亚州]）在总睡眠时间（TST）、入睡潜伏期、睡眠开始后的觉醒时间、觉醒次数和睡眠效率方面的测量结果。
10名年龄在20至24岁之间的健康年轻成年人（50%为女性，100%为亚洲人）连续七个晚上在非优势手上佩戴Fitbit Alta。参与者每天还填写一份CSD。
平均而言，腕戴设备（Fitbit Alta）记录的每晚TST为437.15分钟，平均比CSD记录的时间短5.46分钟（442.61分钟）。Bland-Altman图表明，Fitbit™（Fitbit，旧金山，加利福尼亚州）和CSD记录的睡眠存在很大差异。例如，Fitbit记录的每晚觉醒次数比CSD多2.15次，这相当于睡眠开始后的觉醒时间平均长13.09分钟。
Fitbit和CSD在记录睡眠方面存在显著差异。我们发现，对于大多数睡眠指标，除了记录夜间觉醒外，设备之间的差异程度足够小，可以互换使用。
