title: Circadian Activity Rhythms and Sleep in Nurses Working Fixed 8-hr Shifts.
abstract: Shift work is associated with adverse health outcomes. The aim of this study was to explore the effects of shift work on circadian activity rhythms (CARs) and objective and subjective sleep quality in nurses. Female day-shift (n = 16), evening-shift (n = 6), and night-shift (n = 13) nurses wore a wrist actigraph to monitor the activity. We used cosinor analysis and time-frequency analysis to study CARs. Night-shift nurses exhibited the lowest values of circadian rhythm amplitude, acrophase, autocorrelation, and mean of the circadian relative power (CRP), whereas evening-shift workers exhibited the greatest standard deviation of the CRP among the three shift groups. That is, night-shift nurses had less robust CARs and evening-shift nurses had greater variations in CARs compared with nurses who worked other shifts. Our results highlight the importance of assessing CARs to prevent the adverse effects of shift work on nurses' health.
authors.affiliation: Department of Physical Medicine and Rehabilitation, Taipei Medical University Hospital, Taipei, Taiwan Department of Physical Medicine and Rehabilitation, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
authors.forename: Jiunn-Horng
authors.initials: JH
authors.lastname: Kang
authors.affiliation: School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan, Republic of China.
authors.forename: Nae-Fang
authors.initials: NF
authors.lastname: Miao
authors.affiliation: School of Gerontology Health Management, College of Nursing, Taipei Medical University, Taipei, Taiwan, Republic of China.
authors.forename: Ing-Jy
authors.initials: IJ
authors.lastname: Tseng
authors.affiliation: Maternity Department and Customer Care Officer, Emkhuzweni Health Center, Swaziland.
authors.forename: Trevor
authors.initials: T
authors.lastname: Sithole
authors.affiliation: Graduate Institute of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan, Republic of China minhuey300@tmu.edu.tw.
authors.forename: Min-Huey
authors.initials: MH
authors.lastname: Chung
mesh_terms: D056044:Actigraphy; D000328:Adult; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D006801:Humans; D009726:Nurses; D012890:Sleep / Q000502:physiology*; D014940:Work Schedule Tolerance / Q000502:physiology*
keywords: circadian activity power; frequency–time analysis; shift workers; sleep