What question did this study set out to answer?

To determine whether sinoaortic baroreflex afferents regulate cardiovascular response patterns during natural defense and fighting behaviors.

Role of sinoaortic reflexes in hemodynamic patterns of natural defense behaviors in the cat

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Sinoaortic afferents may buffer hemodynamic instability during confrontation; leaves open baroreflex role in human stress responses.

To determine whether sinoaortic baroreflex afferents regulate cardiovascular response patterns during natural defense and fighting behaviors.
Monitored heart rate, cardiac output, arterial blood pressure, and regional vascular changes in cats during confrontations before and after sinoaortic denervation.
Evaluated responses during immobile confrontation, nonsupportive fighting, and supportive fighting stages.
Compared chronic surgical section of sinoaortic nerves with temporary baroreflex inactivation induced by bilateral common carotid artery occlusion.
During immobile confrontation, sinoaortic denervation exaggerated declines in heart rate, cardiac output, and arterial blood pressure.
During active fighting, denervation blunted rises in heart rate and cardiac output, reduced mesenteric vasoconstriction, and caused arterial pressure to fall, while leaving iliac vascular responses unchanged.
Temporary carotid sinus inactivation via common carotid occlusion replicated the hemodynamic deficits observed with chronic sinoaortic denervation.

Baccelli et al. (1981) studied this question.

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