Exercise-induced bronchoconstriction (EIB) describes the transient narrowing of the airways that follows vigorous exercise. It occurs most commonly in people with currently active asthma but has also been identified in school children, elite athletes and defence force recruits with no clinical diagnosis of asthma. EIB is identified by measuring a 10% fall in the forced expiratory volume in 1 s (FEV₁) from the pre-exercise value within 30 min after exercise.

The maximum % fall in FEV₁ is used to express the severity of EIB, with the area above the % fall in FEV₁ time curve providing an index of severity over time. ....

Expert Review of Respiratory Medicine , August 2012, Vol. 6, No. 4, Pages 355-357.
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