Fig. 4.

Sympathetic responses to steady-state systemic phenylephrine (PE). Data are means ± SE from n = 9. Data were analyzed with a 2-way repeated-measures ANOVA to determine the main effect of relative cluster size (10–100% of total clusters) and condition (baseline, drug) and the interaction of cluster and condition. A: probability of a relative cluster (10–100% of total clusters) firing once per integrated MSNA burst. B: probability of a relative cluster (10–100% of total clusters) firing more than once per integrated MSNA burst.