A sample size of 16 participants for intervention group and 8 for control group are required to detect a difference of one unit in dyspnea Borg-10 scale, assuming a SD of 1 unit in the change in dyspnea score between pre and post measurements (power 80%, level of significance p<0.05). These estimates are based on previous work on dyspnea during exercise. Therefore 24 clinically stable COPD patients with inspiratory muscle weakness (PiMax<70% predicted or <60cmH2O) and dyspnea symptoms (BDI<7) will be included. Patients who are unable to perform exercise testing will be excluded.