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Total peripheral resistance changes in dogs during aversive classical conditioning

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Abstract

The arterial pressure, heart rate, stroke volume, cardiac output and total peripheral resistance of laboratory dogs were monitored continuously before and during a 30 min period in which aversive classical conditioning procedures were applied. The experimental stimulation generated inhibition of behavioral activity (“freezing”) together with sustained increases in arterial pressure averaging 30%, and increases in heart rate and cardiac output of 60–70%. The calculated total peripheral resistance decreased by an average of 20%. The behavioral and cardiovascular responses were sustained during the aversive conditioning period. The results suggest that significant peripheral vasodilation occurred under these conditions which was probably not due to metabolic byproducts of behavioral activity, but probably reflected sympathetic cholinergic effects upon blood vessels in the skeletal muscles. These data document the significance of the skeletal muscle circulation in the total peripheral resistance to blood flow in unanesthetized animals.

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Authors and Affiliations

  1. Division of Behavioral Biology, Department of Psychiatry and Behavioral Sciences, The Johns Hopkins University School of Medicine, Baltimore, Maryland

    D. E. Anderson & J. E. Yingling

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  1. D. E. Anderson
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  2. J. E. Yingling
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Anderson, D.E., Yingling, J.E. Total peripheral resistance changes in dogs during aversive classical conditioning. Pay. J. Biol. Sci. 13, 241–245 (1978). https://doi.org/10.1007/BF03002260

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  • DOI: https://doi.org/10.1007/BF03002260

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