. 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 2.

Spectral parameters of pulse interval (PI), systolic arterial pressure (SAP) and baroreflex sensitivity calculated from longer (500 beats), overlapped time series using autoregressive spectral analysis.

	SHAM	CHF-2wk	CHF-4wk
	(n=7)	(n=7)	(n=7)
Pulse Interval
Variance (ms²)	3.8 ± 1.94	2.8 ± 0.66	4.5 ± 4.8
LF Hz	0.62 ± 0.08	0.65 ± 0.11	0.69 ± 0.07
LF (ms²)	0.16 ± 0.28	0.23 ± 0.26	0.15 ± 0.21
LF (nu)	6.03± 7.7	12.7±15.2	6.5 ± 6.0
HF Hz	1.4 ± 0.14	1.47 ± 0.3	1.56 ± 0.17
HF (ms²)	0.55 ± 0.4	0.65 ± 0.68	1.1 ± 1.8
HF (nu)	42.4± 21.07	40.7 ± 19.6	29.9 ± 18.6
Systolic Pressure
Variance (mmHg²)	15.3 ± 12.5	17.7±10.5	9.9 ± 6.2
LF Hz	0.43 ± 0.05	0.38 ± 0.11	0.3 ± 0.19
LF (mmHg²)	9.7 ± 9.0	3.5 ± 2.7	2.4 ± 1.9
HF Hz	1.5 ± 0.2	1.5 ± 0.4	1.6 ± 0.3
HF (mmHg²)	1.9 ± 2.8	4.7 ± 4	1.4 ± 1.5
Baroreflex
α_LF (ms/mmHg)	0.1±0.17	0.2±0.19	0.15±0.13

All values were expressed as mean ± SD. LF: low frequency; HF: high frequency; nu: normalized units.