Early, but Not Late Chronotypes, Are Up During Their Biological Night When Working the Night Shift

Details

• Personal Author:
  Schernhammer ES ; Vetter C
• Description:
  Bhatti et alrecently examined the impact of chronotype on melatonin levels in shift-workers and concluded that '(...) morning type shift-workers were better able to maintain normal patterns of melatonin secretion (...), suggesting that morning types may be protected against the negative effects of shift-work related melatonin disruption'. However, their data show that, compared to daytime workers sleeping at night, early chronotypes have lower melatonin levels than late chronotypes during daytime sleep after a nightshift. They also show a larger difference in melatonin secretion during their first regular night-time sleep after night shifts suggesting that early chronotypes are more affected by working night shifts than late chronotypes. ... Overall, the paper by Bhatti and colleagues remains difficult to interpret due to several limitations, such as the nonvalidated chronotyping approach with arbitrary cut-off values and a priori exclusion of night shift-workers who sleep during the day on days off (and who likely represent extreme late chronotypes). Future studies are needed to further elucidate the interplay between working times and the circadian system. Working times should be evaluated on an external (social) time-scale as well as an internal (biological) one. [Description provided by NIOSH]
• Subjects:
  Behavior Circadian Rhythm Endocrine System Occupational Health Risk Assessment Risk Factors Safety Shift Work Schedule Sleep Sleep Initiation And Maintenance Disorders
• Keywords:
  Behavior Patterns Circadian Rhythms Endocrine Disruptors Endocrine System Disorders Etiology Hormone Activity Hormones Humans Risk Factors Shift Work Sleep Disorders Statistical Analysis

  More +
• ISSN:
  1351-0711
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Massachusetts ; OSHA Region 1
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  72
• Issue:
  3
• NIOSHTIC Number:
  nn:20052969
• Citation:
  Occup Environ Med 2015 Mar; 72(3):235
• Contact Point Address:
  Dr. Céline Vetter, Channing Division of Network Medicine, Brigham and Women's Hospital, Harvard Medical School, Harvard University, 181 Longwood Ave, Boston, MA 02115 USA
• Email:
  celine.vetter@channing.harvard.edu
• CAS Registry Number:
  Melatonin (CAS RN 73-31-4)
• Federal Fiscal Year:
  2015
• NORA Priority Area:
  Healthcare and Social Assistance
• Performing Organization:
  Brigham and Women's Hospital, Inc., Boston, Massachusetts
• Peer Reviewed:
  False
• Start Date:
  20100801
• Source Full Name:
  Occupational and Environmental Medicine
• End Date:
  20190831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:bfb731f429490ce48b14b63b84c5649d5e29ebd78172f30d7f3a6b36a717766d849538c9721973b5f65ed93aea45e16772f9a4e865945b6b0f112f955e795b88
• Download URL:
  https://stacks.cdc.gov/view/cdc/215850/cdc_215850_DS1.pdf
• File Type:
  [PDF - 403.31 KB ]