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Shift Work and Heart Rate Variability Coherence: Pilot Study Among Nurses.

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Night shift nurses showed autonomic dysregulation during sleep, unlike day shift nurses. A novel heart rate variability (HRV) coherence ratio may indicate shift work-related autonomic imbalance.

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Area of Science:

  • Occupational Health
  • Cardiovascular Physiology
  • Chronobiology

Background:

  • Shift work is prevalent in healthcare, potentially impacting worker health.
  • Autonomic nervous system (ANS) function and circadian rhythms are crucial for health.
  • Heart rate variability (HRV) is a non-invasive measure of ANS activity.

Purpose of the Study:

  • To investigate differences in HRV, sleep, fatigue, and cognitive performance between night and day shift nurses.
  • To explore the utility of a novel HRV measure, the coherence ratio, in shift workers.
  • To assess autonomic regulation patterns in a real-world shift work setting.

Main Methods:

  • Continuous ambulatory HRV monitoring over 36 hours for 11 night shift and 7 day shift nurses.
  • Assessment of symptoms and psychomotor vigilance at the end of the monitoring period.
  • Analysis of HRV coherence ratios and high-frequency HRV power during sleep and work periods.

Main Results:

  • No significant differences in reported symptoms or cognitive performance between groups.
  • Day nurses showed increased HRV coherence ratios during sleep, indicating circadian cardiorespiratory coupling.
  • Night nurses lacked this increase in HRV coherence ratios during sleep, suggesting autonomic dysregulation.

Conclusions:

  • The HRV coherence ratio may serve as a novel indicator of autonomic dysregulation in shift workers.
  • Night shift work, compared to permanent day shifts, appears to disrupt normal autonomic regulation patterns during sleep.
  • This study provides novel insights into the physiological impact of shift work in a non-experimental setting.