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Occupational Medicine 1998;48:523-528
© 1998 Society of Occupational Medicine

research-article

Alteration of circadian time structure of blood pressure caused by night shift schedule

Y. Motohashi*,, S. Higuchi*, A. Maeda*, Y. Liu*, T. Yuasa*, K. Motohashi* and K. Nakamura{dagger}

* Department of Public Health, Akita University School of Medicine Akita, Japan
{dagger} Department of Hygiene and Preventive Medicine, Niigata University School of Medicine Niigata, Japan

The effects of night shift schedules on circadian time structure of blood pressure were studied in seven healthy young subjects by continuous monitoring of blood pressure every 30 min for 72 h. In the control experiment, subjects were instructed to sleep at regular times with the light off at 00.00 h and the light on at 07.00 h. In the shift experiment, they were instructed to go to bed at 06.00 h and wake up at 11.00 h. The circadian rhythm of blood pressure rapidly phase delayed by 3.5 h in the second night shift day as a group phenomenon. Individual differences in changes in power spectral patterns of blood pressure were found in the night shift schedule. Ultradian rhythmicity of blood pressure was more pronounced in three subjects, whereas the circadian rhythmicity was maintained in four subjects. These findings held when the adaptation to shift work was taken into account.

Keywords      Blood pressure; circadian rhythm; ultradian rhythm

Received       17 December 1997
Accepted       11 May 1998

Correspondence and reprint requests to: Dr Y. Motohashi, Professor, Department of Public Health, Akita University School of Medicine, 1-1-1, Hondo, Akita 010, Japan. Tel: (+81) 188-33-1166; Fax: (+81) 188-36-2609; email: motohasi{at}med.akita-u.ac.jp


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