| ECG: | Electrocardiogram |
| EDR: | ECG derived respiration |
| HRV: | Heart rate variability |
| GE: | Gas exchange |
| PPG: | Photoplethysmogram |
| RF: | Respiratory frequency |
| RR interval: | Time between 2 successive R peaks in the ECG |
| RSA: | Respiratory sinus arrythmia |
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