Differential acquisition of specific components of a classically conditioned arterial blood pressure response in rat.

Presenting a 15-s pulsed tone, the conditional stimulus (CS(+)), followed by 0.5-s tail shock, to a well-trained rat causes a sudden, but transient, pressor response (C(1)). Blood pressure (BP) then drops before increasing again (C(2)).

Effects of nicotine and dietary salt on a learned blood pressure response in Dahl-S rats.

We examined the effects of chronic nicotine exposure and dietary salt on the arterial blood pressure (BP) changes learned in response to an acute behavioral stress in the Dahl salt-sensitive rat. Four groups were tested: low salt + vehicle; low salt + nicotine; high salt + vehicle; and high salt + nicotine. Rats were fed a low-salt (0.

Heart rate-arterial blood pressure relationship in conscious rat before vs. after spinal cord transection.

This experiment quantified the initial disruption and subsequent adaptation of the blood pressure (BP)-heart rate (HR) relationship after spinal cord transection (SCT). BP and HR were recorded for 4 h via an implanted catheter in neurally intact, unanesthetized rats. The animals were then anesthetized, and their spinal cords were severed at T(1)-T(2) (n = 5) or T(4)-T(5) (n = 6) or sham lesioned (n = 4).