Fig. 3From: Frequency components of systolic blood pressure variability reflect vasomotor and cardiac sympathetic functions in conscious ratsEffects of subsequent administration of atenolol or atropine after phentolamine treatment on cardiovascular parameters in conscious rats: baseline: before treatments (n = 10); phentolamine: after treatment with phentolamine (10 mg/kg, i.p., n = 10) alone; atenolol after phentolamine: after atenolol administration (10 mg/kg, i.p., n = 5) following phentolamine treatment; atropine after phentolamine: after atropine administration (10 mg/kg, i.p., n = 5) following phentolamine treatment. HR and SBP data are presented as box (median ± interquartile range) and whisker (5 and 95 percentile values) plots, and SBPV data are presented as mean ± SEM. Averaged 20-min data were used as baseline data; data of treatment with autonomic blockers were averaged from 20-min data recorded during the 10–30 min after each injection. *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