 Medication Exclusion Period Oral or injectable corticosteroids - No use within 5 weeks of the screening visit Inhaled, Intranasal and topical steroids - No use within 4 weeks of the screening visit Long acting beta-2 agonists - No use within 48 hours of an exercise challenge or dosing or lung function testing Short acting beta-2 agonists - No use within 6 hours of an exercise challenge or dosing or lung function testing 