An endurance cycle exercise test (Constant work rate (CWR) test) will be used to evaluate dyspnea intensity and unpleasantness at comparable breathing efforts, at comparable work rates on the cycle ergometer, before and after IMT. Patients will be performing a CWR test at 75% of the peak work rate achieved during a maximal incremental cardiopulmonary exercise test (CPET). Before, during and after CWR cycling tests patients will rate their intensity of dyspnea, unpleasantness of dyspnea, breathing related-anxiety and leg discomfort using a modified 10- point Borg scale. Patients will be asked to report qualitative descriptors of dyspnea at the end of the CWR cycling test. Maximum duration of the CWR test will be recorded and levels of minute ventilation will be registered continuously throughout the exercise protocol. With this endurance exercise test the investigators will be able to assess changes in the onset of dyspnea (intensity and unpleasantness) and the performance in endurance exercise before and after IMT.