Table 1. Baseline values of variance (time domain) and spectral parameters (frequency domain) calculated for the heart rate (HR) and systolic arterial pressure (SAP) time series using autoregressive spectral analysis. Values are expressed as means (±SEM).
SN (n=10) TN (n=10) SH (n=10) TH (n=10)
HR Variance, ms2 12.7 (1.6) 18.6 (2.3) 10.3 (1.5) 21.7 (1.4) #
    VLF, ms2 10.0 (1.8) 7.6 (1.4) 5.6 (1.3) 8.4 (1.6)
    LF, ms2 2.4 (.7) 1.1 (.1) 6.0 (.6) * .8 (.2) *#
    LF, nu 21.2 (3.5) 14.7 (1.4) 12.9 (2.4) 14.3 (2.0)
    HF, ms2 4.9 (.6) 4.7 (.4) 4.7 (2.0) 6.2 (1.5)
    HF, nu 77.9 (3.4) 85.0 (1.4) 73.8 (2.3) 84.3 (1.9) #
    LF/HF .4 (.1) .2 (.0) 3.6 (1.0) * .1 (.0) *#
SAP Variance, mmHg2 11.1 (1.3) 9.7 (1.2) 38.8 (6.9) * 28.4 (3.4) *
    LF, mmHg2 3.6 (.4) 3.6 (.6) 17.3 (2.4) * 5.3 (.9) #
    HF, mmHg2 4.6 (.2) 5.4 (.6) 3.9 (.2) 4.9 (.4) #
# p < 0.05 SH.
* p < 0.05 SN and
Abbreviations: VLF; very low-frequency component, LF; low-frequency component, HF; high-frequency component, nu indicates normalized units.