Bronchial asthma exercise challenge test

The bronchial asthma exercise challenge test is based on the following principles. The mechanism of exercise-induced bronchial asthma has not yet been clarified, and may be related to the following factors: 1. Release of some bronchial mediators after exercise. 2. Excessive ventilation during exercise causes loss of airway moisture and heat, resulting in a decrease in airway temperature and changes in osmotic pressure. 3. Hypocapnia and hypoxemia after exercise. 4. Stimulation by inhaling dry and cold air. 5. Adrenergic activity is too strong. 6. Parasympathetic excitability changes. This test is based on changes in respiratory function before and after exercise to determine if there is an asthma attack and to determine the lung function of the subject.