A Blue-Enriched Light Intervention Counteracts the Alertness Decrement Among Mine Workers on Extended 12-Hour Night Shift Periods

J Occup Environ Med. 2023 Jul 1;65(7):584-589. doi: 10.1097/JOM.0000000000002849. Epub 2023 Mar 24.

Abstract

Objective: The aim of the study is to assess whether a blue-enriched light intervention improves nocturnal alertness and daytime sleep of night workers.

Methods: Thirteen miners performing 12-hour night shifts for 12 consecutive nights were exposed to a baseline and a blue-enriched light condition. All subjects wore an actigraph and completed a Psychomotor Vigilance Task at the beginning and at the end of each shift. Data were analyzed with linear mixed models.

Results: In the blue-enriched light condition, the daily increase in median reaction time (RT), mean RT, slowest 10% of RT, and fastest 10% of RT was lower than that observed in the baseline condition between day 1 and 12 ( P ≤ 0.05).

Conclusions: The addition of blue-enriched light during a long period of extended night shifts counteracts most of the daily decline in nocturnal alertness observed in the standard lighting condition, irrespectively of sleep duration and sleep efficiency.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Attention
  • Circadian Rhythm
  • Humans
  • Miners*
  • Sleep*
  • Work Schedule Tolerance