Please use this identifier to cite or link to this item: https://doi.org/10.1093/sleep/zsaa179
Title: COVID-19-related mobility reduction: heterogenous effects on sleep and physical activity rhythms
Authors: Ong, Ju Lynn 
Lau, Teyang 
Massar, Stijn A. A. 
Chong, Zhi Ting
Ng, Ben K. L.
Koek, Daphne
Zhao, Wanting 
Thomas Yeo, B.T. 
Cheong, Karen
Chee, Michael W. L. 
Keywords: COVID-19
Machine learning
Mobility restrictions
Rest-activity rhythms
Sleep
Wearables
Issue Date: 11-Sep-2020
Publisher: Oxford University Press
Citation: Ong, Ju Lynn, Lau, Teyang, Massar, Stijn A. A., Chong, Zhi Ting, Ng, Ben K. L., Koek, Daphne, Zhao, Wanting, Thomas Yeo, B.T., Cheong, Karen, Chee, Michael W. L. (2020-09-11). COVID-19-related mobility reduction: heterogenous effects on sleep and physical activity rhythms. Sleep 44 (2) : zsaa179. ScholarBank@NUS Repository. https://doi.org/10.1093/sleep/zsaa179
Rights: Attribution 4.0 International
Abstract: Study Objectives: Mobility restrictions imposed to suppress transmission of COVID-19 can alter physical activity (PA) and sleep patterns that are important for health and well-being. Characterization of response heterogeneity and their underlying associations may assist in stratifying the health impact of the pandemic. Methods: We obtained wearable data covering baseline, incremental mobility restriction, and lockdown periods from 1,824 city-dwelling, working adults aged 21–40 years, incorporating 206,381 nights of sleep and 334,038 days of PA. Distinct rest-activity rhythm (RAR) profiles were identified using k-means clustering, indicating participants’ temporal distribution of step counts over the day. Hierarchical clustering of the proportion of days spent in each of these RAR profiles revealed four groups who expressed different mixtures of RAR profiles before and during the lockdown. Results: Time in bed increased by 20 min during the lockdown without loss of sleep efficiency, while social jetlag measures decreased by 15 min. Resting heart rate declined by ~2 bpm. PA dropped an average of 42%. Four groups with different compositions of RAR profiles were found. Three were better able to maintain PA and weekday/weekend differentiation during lockdown. The least active group comprising ~51% of the sample, were younger and predominantly singles. Habitually less active already, this group showed the greatest reduction in PA during lockdown with little weekday/weekend differences. Conclusion: In the early aftermath of COVID-19 mobility restriction, PA appears to be more severely affected than sleep. RAR evaluation uncovered heterogeneity of responses to lockdown that could associate with different outcomes should the resolution of COVID-19 be protracted. © Sleep Research Society 2020. Published by Oxford University Press on behalf of the Sleep Research Society.
Source Title: Sleep
URI: https://scholarbank.nus.edu.sg/handle/10635/232958
ISSN: 0161-8105
DOI: 10.1093/sleep/zsaa179
Rights: Attribution 4.0 International
Appears in Collections:Staff Publications

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