Table 4.

Effect of complete cardiac autonomic neural blockade on HR and HRV: intrinsic rate

	Pre			Post
	Baseline	ANS Block*	Δ†	Baseline	ANS Block*	Δ†
HR, beats/min
Ex	113.7 ± 3.9	141.1 ± 5.9‡	27.4 ± 6.6	106.7 ± 3.8	141.5 ± 7.0‡	34.8 ± 8.2
Sed	114.2 ± 7.8	143.5 ± 10.7‡	29.3 ± 13.6	122.9 ± 4.9	142.7 ± 12.0‡	19.8 ± 13.8
HF, ln ms2
Ex	7.2 ± 0.2	0.4 ± 0.1‡	−6.8 ± 0.2	8.0 ± 0.2§	0.5 ± 0.2‡	−7.5 ± 0.2§
Sed	7.3 ± 0.5	0.4 ± 0.2‡	−6.8 ± 0.4	7.2 ± 0.4	0.4 ± 0.1‡	−6.8 ± 0.4
R-Rsd, ms
Ex	59.6 ± 2.7	5.1 ± 0.7‡	−54.5 ± 2.9	91.9 ± 5.6§	4.7 ± 0.5‡	−87.2 ± 5.7§
Sed	67.4 ± 9.9	4.8 ± 0.6‡	−62.6 ± 10.0	65.3 ± 4.4	5.1 ± 0.9‡	−60.3 ± 4.9
R-Rrange, ms
Ex	229.2 ± 10.4	21.0 ± 2.9‡	−208.2 ± 11.2	261.4 ± 10.2§	20.7 ± 2.2‡	−240.7 ± 10.5§
Sed	224.0 ± 21.9	19.5 ± 2.4‡	−204.6 ± 22.0	207.8 ± 11.2	22.0 ± 3.1‡	−185.7 ± 13.4

^*Autonomic nervous system block, combined beta-adrenergic (propranolol HCl, 1.0 mg/kg, iv) and muscarinic (atropine sulfate, 50 μg/kg, iv) receptor blockade.

^†Change from baseline.

^‡P < 0.01 baseline vs. ANS block.

^§P < 0.01 Pre vs. Post.