Inspiratory Flow Parameters With Placebo Easyhaler and Placebo HandiHaler

The study will characterise inspiratory flow parameters across placebo dry powder inhaler Easyhaler (2 inhaler versions) and placebo Spiriva inhalation powder capsule inhaled via HandiHaler in patients with chronic obstructive pulmonary disease (COPD) and in healthy volunteers. Substudy: Easyhaler® and HandiHaler® Usability study in patients with COPD; to assess patients acceptability, preference, correct use and ability to learn to use Easyhaler and HandiHaler (with capsules) and to compare PIF rate via In-Check Dial meter with the PIF rate via spirometer in the main study.