Table 1 Description of HRV time-domain features.
Feature | Unit | Description |
|---|---|---|
RR-sdnn | ms | Standard deviation of RR intervals |
RR-pnn50 | % | Percentage of consecutive RR intervals that vary by more than 50 ms |
RR-pnn20 | % | Percentage of consecutive RR intervals that vary by more than 20 ms |
RR-rmssd | ms | Root mean square of consecutive RR interval differences |
HR-mean | bpm | The mean value of heart rates |
HR-median | bpm | The median value of heart rates |
HR-std | bpm | The standard deviation value of heart rates |
HR-max | bpm | The highest value of heart rates |
HR-min | bpm | The lowest value of heart rates |
HR-p2p | bpm | (peak to peak) The difference of the highest and lowest values of heart rates |
HR-kurtosis | - | The kurtosis value of heart rates |
HR-skewness | - | The skewness value of heart rates |
HR-mad | bpm | The median value of absolute changes of heart rates |
HR-zcr | - | The normalized zero-crossing rate of heart rates |
