| ALS | Amyotrophic Lateral Sclerosis |
| ALSFRS-R | Revised ALS functional rating scale |
| FVC | Forced vital capacity |
| FEV1 | Forced expiratory volume in one second |
| PEF | Peak expiratory flow |
| FEF25–75 | Forced expiratory flow 25–75 |
| ΔPR | Disease progression rate |
| BMI | Body mass |
| LMN | Lower motor neuron |
| UMN | Upper motor neuron |
| HSP | Horizontal spreading pattern |
| VSP | Vertical spreading pattern |
| FAB | Frontal Assessment Battery |
| BDI | Beck Depression Inventory |
| 25(OH)D | 25-hydroxivitamin D |
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