| HRV | Heart rate variability |
| ANS | Autonomic nervous system |
| OSA | obstructive sleep apnea |
| ALLSTAR | Allostatic State Mapping by Ambulatory ECG Repository |
| HR | Heart rate |
| VLF | Very low frequency |
| LF | Low frequency |
| HF | High frequency |
| LF/HF | LF-to-HF ratio |
| Hsi | HF spectral power concentration index |
| CVHR | Cyclic variation in heart rate |
| AHI | Apnea-hypopnea index |
| REM | Rapid eye movement |
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