Exercise Induced Asthma, or EIA (also known as Exercise-Induced Bronchoconstriction, EIB) is a form of(constriction of the airways) which is triggered by strong exercise. It was first reported in 1989.
It's prevalent amongst professional athletes at a far higher level than the general population. For example, some studies have put the prevalence as high as 45% for cyclists and 55% for skiers and skaters,
Although the trigger is known (heavy exercise) the biological mechanisms which lead to EIA asthma attacks, and to such a high prevalence in athletes, are currently unknown.
It's suggested that extensive breathing of cold air via the mouth may be a factor - although it's also found (though to a lesser extent) in athletes who compete in 'Summer' sports.
For extensive technical details see Allergy Journal Volume 63, Issue 4.
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