Table 1.
List of considered features related to the cardiovascular dynamics used in this study.
| Type of Signal Used | Measure | Description |
|---|---|---|
| IBI Time-Domain | Mean IBI | Mean of IBI |
| IBI Time-Domain | SDANN | Standard deviation of IBI |
| IBI Time-Domain | RMSSD | Root mean square of successive differences of the IBI series |
| IBI Time-Domain | NNx | Number of successive IBIs that are longer than a user-defined threshold in milliseconds |
| IBI Time-Domain | pNNx | Percentage of NNx over the duration of the signal |
| IBI Time-Domain | PRVti | Pulse rate variability triangular index |
| IBI Time-Domain | TINN | Triangular interpolation of the IBI histogram |
| IBI Frequency-Domain | VLF | Power of very-low-frequency band |
| IBI Frequency-Domain | LF | Power of low-frequency band |
| IBI Frequency-Domain | HF | Power of high-frequency band |
| IBI Frequency-Domain | LF/HF | Ratio between low- and high-frequency band powers |
| IBI Nonlinear-Domain | SD1 | Standard deviation of instantaneous beat to beat variability (Poincaré plot) |
| IBI Nonlinear-Domain | SD2 | Standard deviation of continuous beat to beat variability (Poincaré plot) |
| IBI Nonlinear-Domain | SampEn | Sample entropy |
| IBI Nonlinear-Domain | Short-term fluctuation slope in Detrended Fluctuation Analysis | |
| IBI Nonlinear-Domain | Long-term fluctuation slope in Detrended Fluctuation Analysis |