| ECG | Electrocardiogram |
| HR | Heart Rate |
| HRV | Heart Rate Variability |
| SQI | Signal Quality Index |
| RR Interval | Time interval between successive R-peaks in the ECG waveform (often used interchangeably with NN interval, where NN = normal-to-normal) |
| EMG | Electromyography |
| bpm | Beats Per Minute |
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