Preavoidance Blood Pressure Elevations Accompanied by Heart Rate Decreases in the Dog

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Science  07 May 1971:
Vol. 172, Issue 3983, pp. 595-597
DOI: 10.1126/science.172.3983.595


Blood pressure and heart rate were monitored continuously in five dogs for 1 hour before performance on a free-operant shock-avoidance task. Cardiovascular changes during the preavoidance hour were characterized by sustained and significant increases in blood pressure, and sustained and significant decreases in heart rate.