| Reversal of hypoxemia |
| Reduced serum lactic acid |
| Reduced pulmonary artery pressure |
| Reduced dynamic hyperinflation |
| Reduced ventilatory muscle and diaphragm fatigue |
| Relief of bronchoconstriction |
| Stimulation of facial, nasal, or pharyngeal receptors |
| Increased capacity for exercise training |
| Placebo effect |
