J Nurs Acad Soc.  1994 Jun;24(2):175-189.

The Changes of the Circadian Rhythm of Mood in Shift Worker

Abstract

This study examined the daily rhythmic patterns of mood in shift workers. Ten rotating shift nurses (shift worker group) were matched with ten non-rotating student nurses (non-shift worker group) working under the same conditions at CUniversity Hospital. The subjecs completed the Mood Adjective Checkist(MAC) every two or three hours from 6AM to 9-11 PM for six consecutive days. The MAC was constructed by Mansour and coversed the mood factors of Anger-Depression. Happiness, Mental, and Social. These data were analyzed by using Cosinor method. The results are summarized as follows; 1. There was no difference in mean scores for Anger-Depression, Happiness, Mental, and Social mood rhythm between the shift workers and the non-shift workers. 2. There was no difference in the amplitude of Anger-Depression, Happiness and Social mood between the two groups, but the shift workers had a higher amplitude of Mental mood. 3. The acrophases of the Anger -Depression mood were between 1:28 and 2:05, and those of Happiness, Social, and Mental mood were between 12:5 and 15:03 for both groups. There were no diffirences between the groups. 4. The number of the subjects with statistically significant mean cosinor rhythms for Anger-Depression and Mental moods were higher in the shift workers than in the non shift workers, but there were no differences between the shift workers and the non-shift workers in those of Happiness and Mental mood. This study showed that the mood manifested circadian periodicities, and a rapidly rotating shift system did not changed the circadian rhythm of mood. It is expected that this study will facilitate a better understanding of circadian rhythm in mood in the shift workers.

Keyword

Circadian Rhythm

MeSH Terms

Anger
Circadian Rhythm*
Happiness
Humans
Periodicity
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