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Occupational Medicine 1998;48:75-79
© 1998 Society of Occupational Medicine

research-article

Effect of forward rapidly rotating shift work on circadian rhythms of arterial pressure, heart rate and oral temperature in air traffic controllers

A. G. Stoynev and N. K. Minkova

Laboratory of Work Physiology, Section of Occupational Medicine, Transport Medical Institute 110, Boul. Marie-Louise, Sofia 1233, Bulgaria

Twenty-four-hour records of arterial pressure (AP), heart rate (HR), oral temperature (OT) and physical and mental performance were obtained in air traffic controllers during morning (n=16), afternoon (n=17) and night (n=19) shifts. Data were analyzed by the cosinor method. The results obtained during the morning shift were as follows (mesor/amplitude/;acrophase): systolic AP (mm Hg)—113.6/10.0/16:03 h; diastolic AP—71.1/8.2—15:19 h; mean AP—85.6/8.8/15:41 h; HR (beats/min)—77.5/8.9/16:00 h; OT (dg C)—36.71/0.21/15:49 h; right-hand grip strength (kg)—49.8/2.0/17:43 h; left-hand grip strength—46.1/2.0/16.08 h; mental performance (calculations/min)—14.9/1.1/16:39 h. During the night shift either no change of the circadian acrophases (HR, right-hand grip strength) or acrophase delays ranging from about 2 h (systolic AP, OT, mental performance) up to 3 h (diastolic and mean AP, left-hand grip strength) were observed. Our data suggest that the shift system studied does not significantly alter the circadian rhythms, and does not induce a desynchronization, particularly as concerns arterial pressure and oral temperature.

Keywords      Arithmetic task; grip strength; performance; sleep; transport

Received       15 May 1997
Accepted        4 August 1997

Correspondence and reprint requests to: A. G. Stoynev, Laboratory of Work Physiology, Section of Occupational Medicine, Transport Medical Institute, 110, Boul. Marie-Louise, Sofia 1233, Bulgaria


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