. Author manuscript; available in PMC: 2010 Oct 1.

Published in final edited form as: Auton Neurosci. 2009 Apr 28;150(1-2):21–26. doi: 10.1016/j.autneu.2009.03.009

Table 1.

Spectral parameters of pulse interval (PI), systolic arterial pressure (SAP) and baroreflex sensitivity calculated from time series using autoregressive spectral analysis. All values were expressed as mean ± SD.

	SHAM	2 WEEKS	4 WEEKS
	(n=7)	(n=7)	(n=7)
Pulse Interval
Variance (ms²)	2 ± 1.4	1.96 ± 1	1.44 ± 0.8
LF Hz	0.42 ± 0.15	0.5 ± 0.2	0.48 ± 0.2
LF (ms²)	0.36 ± 0.3	0.31 ± 0.2	0.17 ± 0.12
LF (nu)	22.6 ± 17.1	16.4 ± 11.1	12.7 ± 7.7
HF Hz	1.4 ± 0.2	1.65 ± 0.4	1.62 ± 0.5
HF (ms²)	0.59 ± 0.4	0.81 ± 0.55	0.66 ± 0.41
HF (nu)	44.5± 13.6	39.9 ± 15.5	45.1 ± 21.6
Systolic Pressure
Variance (mmHg²)	14.2 ± 13.1	16.2 ± 7.8	9.1 ± 5.2
LF Hz	0.43 ± 0.04	0.34 ± 0.1	0.4 ± 0.06
LF (mmHg²)	10.1 ± 9.0	5.6 ± 4.5	3.9 ± 2.7
HF Hz	1.35 ± 0.2	1.62 ± 0.4	1.75 ± 0.3
HF (mmHg²)	2.0 ± 2.6	5.7 ± 3.6	2.9 ± 3.2
Baroreflex
α_LF (ms/mmHg)	0.19 ± 0.11	0.25 ± 0.15	0.23 ± 0.11

LF: low frequency; HF: high frequency; nu: normalized units.