Portable Oxygen Concentrator Improvements to Physical Activity, Oxygen Usage, and Quality of Life in Chronic Obstructive Pulmonary Disease Patients Using Long-term Oxygen Therapy (POC-STEP)

To evaluate changes in activity based on the use of portable oxygen concentrators combined with standard of care (SOC) long- term oxygen therapy versus SOC long-term oxygen therapy alone at 12 weeks in patients with COPD who require continuous (24/7) long-term oxygen therapy. The study will also assess oxygen usage, quality of life, hospitalizations and death.