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Feature | Description | Equation |
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M | Mean value of the R-R | (1) |
HR | Heart rate | (2) |
SDNN | Standard deviation of the R-R | (3) |
CV | Coefficient of the variation | (4) |
RMSSD | Square root of mean of squares of differences between successive R-R | (5) |
NN50 | Variation higher than 50 ms in R-R signal | — |
M0 | Mode of the R-R signal | — |
VR | Variation range of the R-R signal | — |
AM0 | Amplitude of the mode | — |
SI | Stress index | (6) |
IAB | Index of autonomic balance | (7) |
ARI | Autonomic rhythm index | (8) |
IARP | Index of adequate regulation processes | (9) |
HF(Fr) | High frequency Fourier spectral power | — |
LF(Fr) | Low frequency Fourier spectral power | — |
VLF(Fr) | Very low frequency Fourier spectral power | — |
TP(Fr) | Total power of the Fourier spectrum | — |
LF/HF(Fr) | Autonomic balance exponent of the Fourier spectrum | — |
HFmax(Fr) | Maximum power of the HF | — |
HFn(Fr), LFn(Fr), and VLFn(Fr) | Normalized power of the HF, LF, and VLF Fourier spectrum | (10) |
IC | Index of centralization | (11) |
IAS | Index of the subcortical nervous center’s activation | (12) |
RF | Respiration frequency | — |
HF(wt) | High frequency wavelet spectral power | — |
LF(wt) | Low frequency wavelet spectral power | — |
VLF(wt) | Very low frequency wavelet spectral power | — |
HFn(wt), LFn(wt), and VLFn(wt) | Normalized power of the HF, LF, and VLF wavelet spectrum | — |
SDHF(wt), SDLF(wt), and SDVLF(wt) | Standard deviations of the HF(t), LF(t), and VLF(t) wavelet time series | — |
TP(wt) | Total power of the wavelet spectrum | — |
LF/HF(wt) | Autonomic balance exponent of the wavelet spectrum | — |
(LF/HF)max | Maximal value of dysfunctions | — |
(LF/HF)int | Intensity of dysfunctions | — |
Nd | Number of dysfunctions | — |
H | Hurst exponent | (13) |
αmin LF, αmin VLF | Smallest fluctuations of the LF and VLF spectral band | — |
αmax LF, αmax VLF | Greatest fluctuations of the LF and VLF spectral band | — |
WLF, WVLF | Spectrum width of the LF and VLF spectral band | — |
H2LF, H2VLF | Correlation degree of the LF and VLF spectral band | — |
H0LF, H0VLF | Spectrum height of the LF and VLF spectral band | — |
W1/2LF, W1/2VLF | 1/2-width measure of the LF and VLF spectral band | — |
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