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Similar to protocol 1, OP rats exhibited impaired depressor and bradycardic responses compared with CON and OR (P < 0.05). During the activation of all myelinated ADN baroreceptors (3 V), blockade of β1-adrenergic receptors with atenolol had no effect on the depressor responses (A) in any group, but the bradycardic response (B) was reduced in CON and OR rats but not in OP rats. #P < 0.05 vs. pre-atenolol; *P < 0.05, OP vs. CON; †P < 0.05 OP vs. OR.
