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post in: Products, News Date:09 Oct 2017, 12:38 views:2820
Exercise-induced asthma, or,.I.A., occurs when the airways narrow as a result of exercise. The preferred term for this condition is exercise-induced bronchoconstriction eIB exercise does not cause asthma, but is frequently an asthma trigger.
1, contents, signs and regular symptoms, it might be expected that people with.I.B. Would present with shortness of breath, and/or an elevated respiratory rate and wheezing, consistent with an asthma attack.
However, many will present with decreased stamina, or difficulty in recovering from exertion compared to team members, or paroxysmal coughing from an irritable airway.
Similarly, examination may reveal wheezing and prolonged expiratory phase, or may be quite normal. Consequently, a potential for under-diagnosis exists. Measurement of airflow, such as peak expiratory flow rates, which can be done inexpensively on the track or sideline, may prove helpful.
Cause, while the potential triggering events for.I.B. Are well recognized, the underlying pathogenesis is poorly understood. 3, it usually occurs after at least several minutes of vigorous, aerobic activity, which increases oxygen demand to the point where breathing through the nose (nasal breathing) must be supplemented by mouth breathing.
The resultant inhalation of air that has not been warmed and humidified by the nasal passages seems to generate increased blood flow to the linings of the bronchial tree, resulting in edema.
Constriction of these small airways then follows, worsening the degree of obstruction to airflow. There is increasing evidence that the smooth muscle that lines the airways becomes progressively more sensitive to changes that occur as a result of injury to the airways from dehydration.