Journal of Applied Physiology AJP: Heart and Circulatory Physiology
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J Appl Physiol 57: 1417-1421, 1984;
8750-7587/84 $5.00
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Journal of Applied Physiology, Vol 57, Issue 5 1417-1421, Copyright © 1984 by American Physiological Society

ARTICLES

Cardiopulmonary reflexes and blood pressure in exercising sinoaortic-denervated dogs

D. A. Daskalopoulos, J. T. Shepherd and S. C. Walgenbach

To examine the role of cardiopulmonary receptors in arterial blood pressure regulation during and after exercise, conscious dogs with chronic sinoaortic denervation were subjected to 12 min of light exercise and 12 min of exercise that increased in severity every 3 min. Hemodynamic measurements were made before and after interruption of cardiopulmonary afferents by bilateral cervical vagotomy. During both exercise protocols, after an initial transient decrease, the arterial blood pressure remained close to resting values before and after vagotomy. On cessation of the graded exercise, the arterial blood pressure did not change before, but a rapid and sustained increase in pressure occurred after vagotomy. At the time of this increase the cardiac output and heart rate were returning rapidly to the resting level. The study demonstrates that in the chronic absence of arterial baroreflexes, vagal afferents prevent a rise in arterial blood pressure after vigorous exercise presumably by the action of cardiopulmonary receptors causing a rapid dilatation of systemic resistance vessels.


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