Exercise-Induced Bronchoconstriction

Exercise-induced bronchoconstriction (EIB) is transient narrowing of the airways during or, more often, shortly after exercise.

It was once called exercise-induced asthma. Asthma is a chronic inflammatory airway condition with many triggers; EIB is the airway narrowing that exercise provokes. EIB can be one feature of established asthma, or occur on its own in an athlete with no symptoms outside exercise.

It is common in endurance and winter athletes and in those exposed to chlorine or pollutants, and several treatments fall under anti-doping rules.