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The Influence of Ambient Light and Menstrual Status on the Moods of a Nonclinical Population of Young Women

Objective To study the influence of the daily variation in ambient light and menstrual status on mood fluctuation in a nonclinical population of young women. Methods Women kept mood diaries (two per day) over a period of 32 days that straddled the spring equinox. One group believed the purpose of the study was to investigate women's mood change during the menstrual cycle, the other to investigate whether their moods were influenced by the ambient light. Results Women's moods are significantly elevated by light, and this elevation occurs irrespective of the subjects knowledge of the experimental purpose. No evidence for a depression of women's mood in the premenstruum was found, although women who claimed to suffer from premenstrual syndrome (PMS) showed more reversals of their mood during the 32 days records were kept. Conclusions The results highlight the fact that an individual's mood may be influenced by the levels of ambient light as well as the photoperiod.