Journal of Biosciences

, Volume 22, Issue 4, pp 477–488 | Cite as

Pattern of shift rota modulates oral temperature circadian rhythm and sleep-wakefulness profiles in shift workers

  • Shobha Gupta
  • Atanu Kumar Pati
  • Francis Levi


Twenty four shift workers (8 from a steel industry and 16 from a Government hospital) participated in the study. The subjects were instructed to self-measure oral temperature, 4 6 times a day for about three weeks. Sleep quantity and quality for each subject were analysed with the help of an appropriate inventory. The data were analysed by cosinor and power spectrum methods. The frequency of circadian rhythm detection was in the order of 48% in senior nurses, 29% in steel plant workers and 14% in junior nurses. These were also complemented by the results of power spectrum analysis. Present results suggest that rhythms of subjective fatigue and subjective drowsiness are governed neither by oral temperature oscillator nor by the sleep/wake cycle oscillator. The results show that shift rotation pattern chiefly modulates the circadian time structure of shift workers. It is also suggested that the phenomenon of circadian rhythm desynchronization in oral temperature appears to be independent of per day total sleep length.


Circadian rhythm oral temperature rhythm desynchronization shift workers sleep length sleep quality 


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Copyright information

© Indian Academy of Sciences 1997

Authors and Affiliations

  • Shobha Gupta
    • 1
  • Atanu Kumar Pati
    • 1
  • Francis Levi
    • 1
    • 2
  1. 1.C’hronophysiologv Laboratory, School of Life SciencesPt. Ravishankar Shukla UniversityRaipurIndia
  2. 2.‘Laboratoire —Chronobiologie-Chronopharmacologie-Cancer’ SDI-CNRS 1-6212Höpital Paul BrousseVillejuifFrance

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