Table 2.

Effect of cardiac beta adrenergic receptor blockade on HR and HRV

	Pre			Post
	Baseline	β-AR Block*	Δ†	Baseline	β-AR Block*	Δ†
HR, beats/min
Ex	114.0 ± 5.1	95.6 ± 7.7‡	−18.4 ± 3.2	108.1 ± 4.0§	89.1 ± 2.9‡	−19.1 ± 3.4
Sed	115.4 ± 6.7	98.6 ± 5.2‡	−16.8 ± 3.8	122.4 ± 5.9	95.6 ± 2.8‡	−26.8 ± 4.7
HF, ln ms2
Ex	7.2 ± 0.2	7.1 ± 0.3	−0.2 ± 0.3	7.8 ± 0.2§	7.7 ± 0.3	−0.1 ± 0.3
Sed	7.1 ± 0.5	6.7 ± 0.7	−0.4 ± 0.4	7.4 ± 0.4	7.0 ± 0.6	−0.4 ± 0.4
R-Rsd, ms
Ex	61.3 ± 4.0	59.3 ± 7.2	−0.5 ± 6.6	83.3 ± 3.8§	74.7 ± 9.0	−8.6 ± 7.8
Sed	62.2 ± 9.9	61.7 ± 13.8	−2.2 ± 6.1	63.6 ± 7.3	53.6 ± 7.3	−9.9 ± 10.0
R-Rrange, ms
Ex	233.0 ± 11.5	226.2 ± 20.5	−6.9 ± 20.9	246.5 ± 14.0	237.9 ± 13.1	−8.7 ± 20.0
Sed	221.3 ± 26.5	174.4 ± 29.8	−46.9 ± 16.5	220.9 ± 13.3	219.7 ± 33.2	−1.2 ± 29.7

^*β-AR block, beta-adreneroceptor blockade (propranolol HCl, 1.0 mg/kg, iv).

^†Change from baseline.

^‡P < 0.01 baseline vs. β-AR block.

^§P < 0.01 Pre vs. Post.