Fig. 3.

A: representative AP and HR tracings show that the activation of all myelinated and unmyelinated ADN baroreceptors (20 V, 100 Hz) evokes robust reflex responses in CON, OR, and OP rats. The depressor response was preserved in the OP rat, although the magnitude of the bradycardia was still clearly impaired. B: group data show that activation of all ADN baroreceptor afferents evoked frequency-dependent depressor (graph on top) and bradycardic (graph on bottom) responses between 5 and 100 Hz in CON (n = 5) and OR (n = 5) and OP (n = 6) rats. The magnitude of the depressor responses was similar between groups, but the fall in HR was still greatly attenuated in OP rats compared with OR and CON rats. There was no difference in reflex responses between CON and OR rats. *P < 0.05 vs. CON; ^†P < 0.05 vs. OR.