Bronchial asthma is a syndrome characterized by reversible obstruction to airflow and increased bronchial responsiveness to a variety of stimuli, both allergic andenvironmental.
Some mild cases are only symptomatic when provoked by stimuli such as allergens or exercise. In contrast, severe disease is characterized by largely irreversible airflow obstruction,despite optimal medication.
Asthma has significant variability in disease severity within each individual, with intermittent exacerbations and remissions.
Asthma is a chronic illness often arisingduring early childhood. As a consequence, some persons with asthma develop an aversion to exercise.
In considering exercise, the asthmatic population can be grouped into three categories:-Exercise-induced asthma without other symptoms.
Exercise-induced asthma (EIA) is a syndrome characterized by transient airway obstruction usually occurring 5 to 15 minfollowing physical exertion.
When EIA is well-controlled, there is no effect on the exercise response.
Effects of exercise training. The situation of adaptability to training is similar to that ofthe single exercise session response. When EIA is well controlled, asthma has no effect on the adaptations to exercise training.
The medications. The most important treatment is the use of abeta-selective sympathomimetic agonist before exercise. The more recently introduced long acting beta agonists extend the period of protection, but the length of time that the drug remains active after asingle dose decreases.
Protection for some persons with EIA might be provided by leukotriene-receptor antagonists. These medications have some practical advantages, including a protective effectlasting over 24 hours, a single daily dose administration by mouth, and no major adverse effects. A variety of other agents have variable benefit against EIA.
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