[Various physiopathological aspects of asthma due to effort]

Ten patients with various clinical forms of bronchial asthma were subjected to exercise of increasing intensity on the bicycle ergometer. It was found that effort is not capable of causing a true asthma crisis, though it may lead to the appearance or accentuation of bronchostenosis. Inhalation of acetylcholine during the tests, however, constantly resulted in crises, even in cases where acetylcholine alone had not caused bronchostenosis.