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. Author manuscript; available in PMC: 2008 Feb 28.
Published in final edited form as: Physiol Behav. 2006 Nov 14;90(2-3):386–393. doi: 10.1016/j.physbeh.2006.09.037

Figure 2.

Figure 2

Mean (± SEM) heart rate (Panel A), SDNN index (Panel B), and respiratory sinus arrhythmia amplitude (Panel C) during a resting baseline period and following β-adrenergic receptor blockade with atenolol (8 mg/kg ip), cholinergic receptor blockade with atropine (4 mg/kg ip), and combined autonomic blockade with both drugs. Note the scale differences among the three panels. *P < 0.05 vs. respective resting baseline value.