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A longitudinal analysis of COVID-19 lockdown stringency on sleep and resting heart rate measures across 20 countries.
Ong, Ju Lynn; Lau, TeYang; Karsikas, Mari; Kinnunen, Hannu; Chee, Michael W L.
  • Ong JL; Centre for Sleep and Cognition, Human Potential Program, Yong Loo Lin School of Medicine, National University of Singapore, 12 Science Drive 2, Singapore, 117549, Singapore.
  • Lau T; Centre for Sleep and Cognition, Human Potential Program, Yong Loo Lin School of Medicine, National University of Singapore, 12 Science Drive 2, Singapore, 117549, Singapore.
  • Karsikas M; Oura Health, Oulu, Finland.
  • Kinnunen H; Centre for Life Course Health Research, University of Oulu, Oulu, Finland.
  • Chee MWL; Oura Health, Oulu, Finland.
Sci Rep ; 11(1): 14413, 2021 07 13.
Article in English | MEDLINE | ID: covidwho-1309468
Preprint
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ABSTRACT
Lockdowns imposed to stem the spread of COVID-19 massively disrupted the daily routines of many worldwide, but studies to date have been mostly confined to observations within a limited number of countries, based on subjective reports and surveys from specific time periods during the pandemic. We investigated associations between lockdown stringency and objective sleep and resting-heart rate measures in ~ 113,000 users of a consumer sleep tracker across 20 countries from Jan to Jul 2020, compared to an equivalent period in 2019. With stricter lockdown measures, midsleep times were universally delayed, particularly on weekdays, while midsleep variability and resting heart rate declined. These shifts (midsleep + 0.09 to + 0.58 h; midsleep variability - 0.12 to - 0.26 h; resting heart rate - 0.35 to - 2.08 bpm) correlated with the severity of lockdown across different countries (all Ps < 0.001) and highlight the graded influence of stringency lockdowns on human physiology.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Sleep / Communicable Disease Control / COVID-19 / Heart Rate Type of study: Cohort study / Observational study / Prognostic study Limits: Humans Language: English Journal: Sci Rep Year: 2021 Document Type: Article Affiliation country: S41598-021-93924-z

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Sleep / Communicable Disease Control / COVID-19 / Heart Rate Type of study: Cohort study / Observational study / Prognostic study Limits: Humans Language: English Journal: Sci Rep Year: 2021 Document Type: Article Affiliation country: S41598-021-93924-z