This is a cross-over study with randomization in terms of 4 treatments: two long-acting muscarinic antagonists (tiotropium and glycopyrronium), one long-acting beta-adrenoceptor agonist(indacaterol) and placebo.
Each subject will pass 4 experimental random sessions, separated by at least 48 hours given the pharmacokinetic properties of the drugs tested. During each of the 4 sessions, blood pressure will be measured. Drugs inhaled by the patient will be prepared and administered by the nurse according to the randomization schedule. Patients and investigators will be blinded regarding the administered drug/placebo (anonymized inhaler). After 15 minutes (at rest, at neutral temperature), patients will have continuous measurement of blood pressure and heart rate (by a sphygmomanometer) (1) in supine position and (2) after a passive tilt test on a tilt test table.
A flow-volume loop (BDV) will be performed after the tilt table test (measurement of Forced expiratory volume in 1 second (FEV1) and FVC).
