Altered Circadian Periodicities in Oral Temperature and Mood in Men on an 18-Hour Work-Rest Cycle During a Nuclear Submarine Patrol
Abstract
A group of nuclear submariners was studied to examine whether an 18-h routine imposed by a watch-standing schedule of 6-h on, 12-h off during a prolonged submerged patrol affected the 24-h circadian rhythm in oral temperature, Thayer's activation, Mood 'Activity' and Mood 'Happiness.' The submariners were observed during three sections of the patrol: Phase 1, the beginning 8-day period; Phase 2, the middle of the voyage; and Phase 3, the last 7-8 day period of the 10-week voyage. The group-synchronized 24-h rhythm in oral temperature disappeared during Phase 3. The group-synchronized 24-h rhythms in Thayer's activation and in Mood 'Activity' and 'Happiness' disappeared during Phases 2 and 3. A group synchronized 18-h rhythm was not produced in any of the variables in any Phase of this study, except MH during Phase 2. Periodicity analysis of individuals' data showed that a loss of 24-h rhythmicity in oral temperature was due not only to reduced circadian amplitude but also to a dispersion of TOPs. Loss of 24-h rhythm in 'Activation,' 'Happiness,' and 'Activity' was predominantly due to a wider dispersion of TOPs. The 18-h routine did appear to exert a small modulating effect on rhythmic activity in the variables examined in this study.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1981
- Accession Number
- ADA102590
Entities
People
- Arthur N. Beare
- Carl E. Englund
- Paul Naitoh
- Robert J. Biersner
Organizations
- Naval Health Research Center