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STUDIES UPON THE RELATIONSHIP BETWEEN BARORECEPTOR AND SYMPATHETIC ACTIVITY
1 Departments of Physiology and Pharmacology, Middlesex Hospital Medical School, London, W.1
Simultaneous recordings of sympathetic activity in the right inferior cardiac nerve, and of baroreceptor activity in the common carotid baroreceptor nerve were made in cats with an isolated common carotid artery and sinus area.
The effect of the change from non-pulsatile to pulsatile sinus pressure was to impose a rhythm synchronous with the pump upon sympathetic activity. The changes in amplitude of sympathetic activity were investigated.
The inhibition of sympathetic activity by carotid traction was used to identify sympathetic fibres.
The baroreceptor-sympathetic reflex delay was of the order of 200 m/sec. thus providing a beat to beat control of cardiac activity.
Submitted on December 29, 1966
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