Pulmonary Rehabilitation in Patients With Fibrotic Interstitial Lung Disease

Inclusion Criteria: 1. Restriction on pulmonary function testing (TLC \<80%, FEV1/FVC ratio \> predicted or DLCO \< 80%) 2. Evidence of fibrosis on high resolution computed tomography of the chest. 3. Fibrosis on surgical lung biopsy if performed 4. Referral for pulmonary rehabilitation Exclusion Criteria: 1. Participation in pulmonary rehabilitation in the past 24 months 2. Inability to complete 6 minute walk test or study questionnaires 3. Limitations other than dyspnea (e.g. arthritis) that affect ability to participate in pulmonary rehabilitation 4. Baseline 6 minute walk distance \> 400 meters 5. Planned change in medication treatment for lung disease during the course of pulmonary rehabilitation 6. Ejection fraction known to be \< 25% 7. Contraindications to pulmonary rehabilitation (clinically unstable, uncontrolled arrhythmia or hypertension, symptomatic or uncontrolled hypotension with systolic blood pressure of \< 95, active angina, unexplained syncope or worsening dizziness, limiting orthopedic or neurological disorders, psychiatric impairment that inhibits cooperation in the program) 8. FEV1/FVC \< 65% 9. Unable to provide informed consent