Fig. 4From: Frequency components of systolic blood pressure variability reflect vasomotor and cardiac sympathetic functions in conscious ratsEffects of subsequent administration of phentolamine or atropine after atenolol treatment on cardiovascular parameters in conscious rats: baseline: before treatments (n = 10); atenolol: after treatment with atenolol (10 mg/kg, i.p., n = 10) alone; phentolamine after atenolol: after phentolamine administration (10 mg/kg, i.p., n = 5) following atenolol treatment; atropine after atenolol: after atropine administration (10 mg/kg, i.p., n = 5) following atenolol treatment. HR, SBP, and SBPV data are presented as in Fig. 3. In this figure, 20-min data were employed in the same manner as those used in Fig. 3. *p < 0.05, **p < 0.01 and ***p < 0.001 compared with baseline (paired t test);†p < 0.05, ††p < 0.01 and †††p < 0.001 when compared with first and second treatment [two-way analysis of variance (ANOVA) and Holm’s post hoc test]Back to article page