Comparison of the Effects of Indacaterol and Tiotropium on Inspiratory Capacity

Inclusion Criteria: * Diagnosis of moderate (as classified by the Global Initiative for Chronic Obstructive Lung Disease \[GOLD\] Guidelines, 2007) chronic obstructive pulmonary disease (COPD) and: 1. Smoking history of at least 10 pack-years. 2. Forced expiratory volume in 1 second (FEV1) \< 80% and ≥ 50% of the predicted normal value. 3. Post-bronchodilator FEV1/Force vital capacity (FVC) \< 0.7. Exclusion Criteria: * Patients who have had a COPD exacerbation requiring systemic glucocorticosteroid treatment or antibiotics and/or hospitalization in the 6 weeks prior to screening. * Patients who have had a respiratory tract infection within 6 weeks prior to screening. * Patients with concomitant pulmonary disease. * Patients with alpha-1-antitrypsin deficiency. * Patients with contraindications for tiotropium treatment. * Patients with a history of hypersensitivity to any of the study drugs or to drugs from similar drug classes. Other protocol-defined inclusion/exclusion criteria applied to the study.