Application of the Lomb-Scargle Periodogram to InvestigateHeart Rate Variability during Haemodialysis
Table 1
Results from 100 simulations of random noise in the “distorted” signal (Figure 2) compared against the ls periodogram estimated for the original synthetic signal (Figure 1).
Original synthetic signal
Distorted signal (mean ± std)
Mean average RR interval (sec)
1.009 ± 0.0038
0.9196 ± 0.0061
Range RR intervals
0.151
0.870 ± 0.110
LF power (nu)
0.39
0.32 ± 0.04
HF power (nu)
0.61
0.62 ± 0.04
LF/HF
0.6357
0.52 ± 0.09
LF peak height (ms2/Hz)
0.1668
0.54 ± 0.16
HF peak height (ms2/Hz)
0.2601
0.68 ± 0.18
(Al/Ah)2
0.6413
0.79 ± 0.34
LF peak location (mHz)
95
97.4 ± 19.6
HF peak location (mHz)
275
275.8 ± 9.1
LF Δf3dB (Hz) ×10−3
3.00
3.6 ± 0.11
HF Δf3dB (Hz) ×10−3
2.90
3.4 ± 0.91
Fraction of power within ± 0.01 Hz of LF band
0.76
0.69 ± 0.21
Fraction of power within ± 0.01 Hz of HF band
0.75
0.86 ± 0.22
Total power (dB)
−28.46
−17.97 ± 0.41
All data points in the distorted signal are used to estimate the power spectra.
