Average LV +dP/dt (A) and LV −dP/dt values (B) in the experimental groups (Sham, n=5; HF-ND, n=7; HF-CR, n=6) evaluated under basal conditions and after maximal isoproterenol stimulation (ISO). Data are presented as mean±SEM. *p<0.05 vs Sham at basal, **p<0.001 vs Sham at basal, #p<0.0001 vs Sham after ISO, ^p<0.001 vs HF-ND after ISO, ^^p<0.05 vs Sham and HF-ND after ISO. Two-way ANOVA analysis and Bonferroni test were used among groups.