Why does physical exertion sometimes cause an asthma attack?
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During exercise, rapid breathing occurs through the mouth. As a result, the air that reaches the bronchial tubes has not been warmed and humidified by passing through the nose. This cold, dry air can trigger asthma symptoms. It usually takes six to eight minutes of sustained aerobic exercise to bring out asthma symptoms, which may then occur for several minutes after the exercise has been completed. If asthma symptoms begin after fewer than six to eight minutes of hard exercise or during or after very mild exercise, a person’s asthma may be out of control and these symptoms should be discussed with a physician. More than 70 percent of all people with asthma suffer some degree of exercise-induced asthma, which is usually preventable. Should persons with asthma avoid sports and exercise? By taking preventive measures, people with asthma should be able to compete in sports. However, not all sports are tolerated equally well. In general, exercise and most sports that involve prolonged peri