Intervention Study to Investigate Supplemental Oxygen in COPD

The purpose of this trial is to study the effects on exercise capacity, physical activity, inflammatory markers and quality of life of supplemental ambulatory oxygen, to be used during physical activity, in patients with COPD who are normoxic at rest but hypoxemic during a six-min walk test. Our hypothesis is that if patients are able to use supplemental oxygen they will be more physically active and thereby improve health related quality of life.