[Inhibition of the cardiochronotropic component of baroreceptor reflexes following activation of somatic afferents]

Abstract

Stimulation of cutaneous or muscle nerve as well as activation of ventral roots L6--S1 led to inhibition of vagal bradycardia evoked by noradrenaline, in unanesthetized decerebrated cats. Unnociceptive stimulation of m. gastrocnemius in unrestrained cats evoked contraction of the muscle and was followed by depression of the cardiac component of baroreceptive reflex. Propranolol had no effect on this response, while methylatropin abolished it completely.