Controlled Exposure to Light and Darkness Realigns the Salivary Cortisol Rhythm in Night Shift Workers

Jan 14, 2005Chronobiology international

Timed light and dark exposure resets daily stress hormone cycle in night shift workers

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Abstract

Night shift workers receiving a light/darkness intervention showed significant shifts in cortisol expression timing.

  • Intervention included bright light exposure and shielding from morning light.
  • Treatment group exhibited realignment of their physiological rhythms with night-oriented schedules.
  • Control group demonstrated only smaller phase shifts, indicating incomplete adaptation.
  • Findings suggest that managing light and darkness exposure may aid in adjusting physiological responses to night shift work.

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