Asthma & Exercise-Induced Bronchoconstriction

Asthma is a chronic airway condition with variable airflow obstruction and inflammation. Exercise-induced bronchoconstriction (EIB) is transient airway narrowing triggered by exercise (often peaking ~5–15 minutes after exercise), causing cough, wheeze, chest tightness, breathlessness. EIB can occur in people with or without diagnosed asthma. Exercise itself is beneficial and should not be avoided when asthma is controlled.

Exercise prescription (ACSM): follow general adult guidelines — ≥150 min/week moderate aerobic plus resistance training — adjusted to control and symptoms.

Managing EIB:

• Use prescribed medication as directed — e.g., a short-acting bronchodilator (inhaler) ~10–15 minutes before exercise, and/or controller medications for underlying asthma. Follow the individual's asthma action plan.
• Extended/graduated warm-up can induce a refractory period that reduces EIB severity.
• Environmental awareness: cold/dry air, high pollen, air pollution, and chlorine fumes can trigger symptoms; warm, humid environments (e.g., swimming) are often well tolerated (swimming). Breathe through the nose or use a mask/scarf in cold air.
• Keep a rescue inhaler accessible during exercise.

• Intermittent/interval formats may be better tolerated than prolonged continuous high-intensity work for some.
• Ensure asthma is well controlled before progressing intensity; poorly controlled asthma raises risk.

• Do not exercise during an acute asthma exacerbation; stabilize first.
• Stop and use rescue medication / seek care for severe breathlessness, wheeze not relieved by inhaler, chest tightness, lips/fingertips turning bluish, or peak-flow drop per the action plan.
• Get medical guidance/clearance if asthma is poorly controlled or symptoms appear with exertion (medical-clearance-screening).

Educational only; not medical advice. Asthma medication use and exercise should follow a physician-prescribed asthma action plan; do not alter medication based on this content.

• Controlled asthma should not prevent exercise; follow general adult guidelines.
• EIB peaks ~5–15 min post-exercise (cough/wheeze/tightness/breathlessness).
• Manage with prescribed pre-exercise bronchodilator (~10–15 min before) + controllers; keep rescue inhaler accessible.
• Extended warm-up reduces EIB; warm/humid air (swimming) often well tolerated; avoid cold/dry/polluted air triggers.
• Don't exercise during an exacerbation; seek care for breathlessness not relieved by inhaler.

• exercise-is-medicine — exercise benefits respiratory health.
• warm-up-cool-down — the protective extended warm-up.
• swimming — often well-tolerated humid environment.
• medical-clearance-screening — clearance if poorly controlled.