A Study in Pediatric Patients With Cystic Fibrosis Lung Disease

Inclusion Criteria: * Have confirmed diagnosis of CF * Have an FEV1 greater than or equal to 60% * Have oxygen saturation greater than or equal to 90% on room air * Be clinically stable for at least 4 weeks prior to screening * Be able to reproducibly perform spirometry maneuvers Exclusion Criteria: * Have clinically significant comorbidities * Have changed their physiotherapy technique or schedule within 7 days prior to screening * Using prior and concurrent medications according to protocol