Table 2.

Spontaneous baroreflex gain, heart rate, and blood pressure variability in lesion and control rats

	Up Sequences, ms/mmHg	Down Sequences, ms/mmHg	All Sequences, ms/mmHg	Alpha, LF	Alpha, HF	LF power, mmHg2	BP SDNN	LF RRI, nu	HF RRI, nu	LF-to-HF Ratio
Control (11)
SBP	1.63 ± 0.16	1.70 ± 0.16	1.70 ± 0.13	0.76 ± 0.13	1.93 ± 0.26	16.8 ± 2.2	5.01 ± 0.43
MBP	2.00 ± 0.1	2.33 ± 0.14	2.17 ± 0.09	0.84 ± 0.14	2.29 ± 0.20	15.7 ± 2.9	4.22 ± 0.28	41.5 ± 4.8	39.2 ± 4.2	1.34 ± 0.27
DBP	1.88 ± 0.13	1.96 ± 0.13	1.93 ± 0.12	0.94 ± 0.17	2.07 ± 0.13	7.9 ± 0.8	3.97 ± 0.23
Lesion (12)
SBP	2.30 ± 0.27	2.20 ± 0.42	2.10 ± 0.26	0.69 ± 0.11	2.59 ± 0.60	8.4 ± 0.7**	3.55 ± 0.20**
MBP	2.59 ± 0.19*	2.64 ± 0.28	2.56 ± 0.24	0.84 ± 0.12	3.43 ± 0.52	7.95 ± 0.8**	3.33 ± 0.24**	30.7 ± 3.4	54.2 ± 3.0**	0.62 ± 0.10*
DBP	2.32 ± 0.17**	2.29 ± 0.19	2.62 ± 0.34	0.71 ± 0.11	2.99 ± 0.45	6.7 ± 0.6	3.11 ± 0.20**

Values are group means ± SE determined for systolic (SBP), mean (MBP), and diastolic (DBP) blood pressure where applicable; no. of rats in parentheses. Spontaneous heart rate baroreflex gain was determined using the sequence method including up and down sequences as well as the average of all sequences that met baroreflex criteria outlined in text. Spontaneous heart rate baroreflex gain was also determined from the spectral method (correlation coefficient between heart rate interval and blood pressure) in the low (alpha LF)- and high (alpha HF)-frequency domains. Power of blood pressure variability in the low frequency domain (LF power) and in the time domain (BP SDNN) are shown as well as the heart rate variability in the LF and HF domains as well as the LF-to-HF ratio.

^*P < 0.05 and

^**P < 0.01 vs. control.