The Effects of Oscillatory Positive Expiratory Pressure (OPEP) Therapy in Patients With COPD

Inclusion Criteria: 1. Males and females 40 years of age or more 2. Former/current smokers with a cigarette smoking history for 10 or more pack-years 3. Physician diagnosis of COPD previously confirmed by spirometry (FEV1/FVC less than 0.7) with 'mild' to 'very severe' (i.e. GOLD 1-4) COPD 4. Chronic bronchitis phenotype: Sputum production or presence of productive cough greater than 2 days/week in the last 3 months for at least 2 consecutive years, or presence of cough and phlegm almost every day or several times per week 5. Ability to participate without supplemental oxygen during all oscillometry testing 6. Ability to provide informed consent Exclusion Criteria: 1. No COPD diagnosis 2. Bronchiectasis, cystic fibrosis, or any other known suppurative acute/chronic lung disease as the principal respiratory condition 3. Physician-diagnosed exacerbation and/or hospitalization for pulmonary symptoms in the 4 weeks preceding baseline testing 4. Current use of OPEP, or any use of OPEP in the 4 weeks preceding baseline testing 5. Current or recent participation in a standard Pulmonary Rehabilitation program in the 4 weeks preceding baseline testing or during the study