| Respiratory frequency | |
| bpm | Breaths per minute |
| SB | Slow breathing |
| QB | Quiet breathing |
| FB | Fast breathing |
| FOS | Fiber-optic sensor |
| DF | Differential flowmeter |
| HWA | Hot wire anemometer |
| FBG | Fiber Bragg Grating |
| Q | Airflow |
| P | Pressure |
| ΔP | Pressure drop |
| i | Current |
| R | Resistance |
| Wavelength | |
| I | Light intensity |
| V | Voltage |
| FEV1 | Forced expiratory volume in the 1st second |
| FVC | Forced vital capacity |
| T | Temperature |
| CORSA | Computerized Respiratory Sound Analysis |
| C | Capacitance |
| E | Applied voltage |
| CO2 | Carbon dioxide |
| MOD | Mean of differences |
| LOA | Limit of agreement |
| Bragg wavelength | |
| RH | Relative humidity |
| ppm | Parts per million |
| NDIR | Nondispersive infrared |
| COPD | Chronic obstructive pulmonary disease |
| Z | Impedance |
| MEMS | Mechanical and micro-electromechanical system |
| IMU | Inertial Measurement Unit |
| PPG | Photoplethysmography |
| ECG | Electrocardiography |
| EDR | ECG-derived respiration |
| RSA | Respiratory sinus arrhythmia |
| LED | Light-emitting diodes |
| PD | Photodetector |
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