Comparison of Wearable Activity Tracker with Actigraphy for Sleep Evaluation and Circadian Rest-Activity Rhythm Measurement in Healthy Young Adults

Hyun-Ah Lee, Heon-Jeong Lee, Joung-Ho Moon, Taek Lee, Min-Gwan Kim, Hoh In, Chul-Hyun Cho, Leen Kim, Hyun-Ah Lee, Heon-Jeong Lee, Joung-Ho Moon, Taek Lee, Min-Gwan Kim, Hoh In, Chul-Hyun Cho, Leen Kim

Abstract

Objective: The purpose of this study was to evaluate the applicability of data obtained from a wearable activity tracker (Fitbit Charge HR) to medical research. This was performed by comparing the wearable activity tracker (Fitbit Charge HR) with actigraphy (Actiwatch 2) for sleep evaluation and circadian rest-activity rhythm measurement.

Methods: Sixteen healthy young adults (female participants, 62.5%; mean age, 22.8 years) wore the Fitbit Charge HR and the Actiwatch 2 on the same wrist; a sleep log was recorded over a 14-day period. We compared the sleep variables and circadian rest-activity rhythm measures with Wilcoxon signed-rank tests and Spearman's correlations.

Results: The periods and acrophases of the circadian rest-activity rhythms and the sleep start times did not differ and correlated significantly between the Fitbit Charge HR and the Actiwatch 2. The Fitbit Charge HR tended to overestimate the sleep durations compared with the Actiwatch 2. However, the sleep durations showed high correlation between the two devices for all days.

Conclusion: We found that the Fitbit Charge HR showed high accuracy in sleep evaluation and circadian rest-activity rhythm measurement when compared with actigraphy for healthy young adults. The results suggest that the Fitbit Charge HR could be applicable on medical research as an alternative tool to actigraphy for sleep evaluation and measurement of the circadian rest-activity rhythm.

Keywords: Actigraphy; Circadian rest-activity rhythm; Comparison; Sleep; Wearable activity tracker.

Figures

Figure 1. Scatter plot of sleep start…
Figure 1. Scatter plot of sleep start time between Actiwatch 2 and Fitbit Charge HR. Sleep start time was compared between the two devices for all participants. Each of sleep start time was assessed from two different devices. For analysis, sleep start time was calculated by time had passed from 18:00, and converted to minutes. Each number of axis x and y indicate the sleep start time, that is total time (minutes) has passed from 18:00 to sleep start time. The black spots are all values of sleep start time between Actiwatch 2 and Fitbit Charge HR. The solid line indicates correlation coefficient of Spearman's correlation (r=0.869, p
Figure 2. Scatter plot of sleep duration…
Figure 2. Scatter plot of sleep duration between Actiwatch 2 and Fitbit Charge HR. Sleep duration was compared between the two devices for all participants. Each of sleep duration was assessed from two different devices. Each number of axis x and y indicate the sleep duration. The black spots are all values of sleep duration between Actiwatch 2 and Fitbit Charge HR. The solid line indicates correlation coefficient of Spearman's correlation (r=0.918, p

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