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Science 7 May 1971:
Vol. 172. no. 3983, pp. 595 - 597
DOI: 10.1126/science.172.3983.595
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Articles

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

David E. Anderson 1 and Joseph V. Brady 1

1 Department of Psychiatry and Behavioral Science, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205

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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)