| COVID-19 | Coronavirus Disease-2019 |
| HRV | Heart Rate Variability |
| APT | Aerobic Physical Training |
| RRi | R-R intervals beat by beat |
| SDNN | Standard Deviation of Normal RRi |
| RMSSD | Square Root of the Mean of the Square of the Differences between Adjacent Normal RRi |
| HF | High-Frequency Oscillations |
| LF | Low-Frequency Oscillations |
| BMI | Body Mass Index |
| FFT | Fast Fourier Transform |
| SBP | Systolic Blood Pressure |
| DBP | Diastolic Blood Pressure |
| MBP | Mean Blood Pressure |
| HR | Heart Rate |
| SD | Standard Deviation |
| VO2peak | Peak Oxygen Consumption |
| MET | Metabolic Equivalent |
| HFms2 | High-Frequency Oscillations in Absolute Values |
| LFms2 | Low-Frequency Oscillations in Absolute Values |
| HFnu | High-Frequency Oscillations in Normalized Values |
| LFnu | Low-Frequency Oscillations in Normalized Values |
| RER | Respiratory Exchange Ratio |
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