Inclusion Criteria:  diagnosis of IPF according to ATS/ERS guidelines dyspnea at rest (VAS ≥ 1) or on exertion (mMRC ≥ 1)  Exclusion Criteria:  diffuse interstitial lung disease other than IPF other significant chronic pathology that may cause dyspnea: chronic obstructive pulmonary disease, asthma, heart failure, anemia, obesity (non-exhaustive list), except for pulmonary hypertension