The Influence of Light at Night Exposure on Melatonin Levels among Canadian Rotating Shift Nurses

Sep 29, 2011Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology

Nighttime light exposure and melatonin levels in Canadian rotating shift nurses

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Abstract

Mean light exposure was significantly higher (P < 0.0001) during nighttime shifts.

  • Melatonin production patterns did not differ between day and night shifts.
  • Peak melatonin levels and daily changes in melatonin were similar across shifts.
  • No significant association was found between light exposure and melatonin levels when considering both shifts together.
  • An inverse relationship between light exposure and change in melatonin was observed during night shifts (P = 0.04).
  • Light exposure does not appear to be strongly related to reduced melatonin production among nurses on a rapidly rotating shift schedule.

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