Influence of Cromones on Eucapnic Hyperventilation (EVH)-Test in Young (Elite) Athletes Who Tested Positive for EIB.

Inclusion Criteria: * Diagnosis of exercise-induced-bronchoconstriction (EIB) based on positive EVH-test in WP1 (s59778) or WP2 (s61602) * BMI between 5th and \<85th percentile for age and gender Exclusion Criteria: * Clinically diagnosed asthma * Baseline lung function: * FEV1%: ≤80% predicted FEV1% * Tiffeneau: FEV1/FVC% \< 85% * Salbutamol-induced FEV1 reversibility ≥ 12% * Any disorder, which in the investigator's opinion might jeopardize participant's safety or compliance with the protocol * Smoker * Participation in other study related to IMP * If applicable: female who is pregnant, breast-feeding or intends to become pregnant or is of child-bearing potential and not using an adequate contraceptive method