Exercise-Induced Asthma
Asthma symptoms triggered by physical exertion and exercise.
Overview
Exercise-induced asthma (EIA), also known as exercise-induced bronchoconstriction (EIB), occurs when physical activity triggers asthma symptoms. It affects many people with asthma and can also occur in individuals without a history of asthma.
symptoms
- Coughing during or after exercise
- Wheezing
- Shortness of breath
- Chest tightness
- Fatigue during exercise
- Symptoms typically begin 5-20 minutes after starting exercise
- Symptoms may peak 5-10 minutes after stopping exercise
mechanism
During exercise, rapid breathing through the mouth causes the airways to lose heat and moisture, leading to airway cooling and drying. This can trigger bronchoconstriction in sensitive individuals.
triggers
- Vigorous physical activity
- Cold, dry air
- High-intensity exercise
- Endurance activities
- Poorly controlled underlying asthma
evaluation
history
Detailed history of symptoms during or after exercise, type of activities that trigger symptoms, and response to treatment
physical
Lung examination, assessment for underlying asthma
testing
- Spirometry at rest and after exercise (exercise challenge test)
- Eucapnic voluntary hyperventilation (EVH) test
- Methacholine challenge test
- Assessment of underlying asthma control
rule Outs
- Cardiac conditions
- Vocal cord dysfunction
- Poor physical fitness
- Anxiety or panic disorders
treatment
prophylaxis
- Short-acting beta-agonist (SABA) - albuterol 15-30 minutes before exercise
- Long-acting beta-agonist (LABA) - for frequent exercise
- Leukotriene receptor antagonists - daily for prevention
- Inhaled corticosteroids - if underlying asthma is present
management
- Warm-up exercises before vigorous activity
- Cool-down period after exercise
- Avoid exercise in cold, dry conditions when possible
- Use a face mask or scarf in cold weather
- Choose activities with less intense breathing (swimming is often well-tolerated)
- Have rescue medication available during exercise
prevention
- Ensure underlying asthma is well-controlled
- Avoid exercise during respiratory infections
- Monitor air quality and avoid exercise on high-pollution days
- Stay hydrated
- Consider exercise in warmer, more humid environments
prognosis
With proper management, most people with exercise-induced asthma can participate in physical activities and sports without significant limitations.
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