Shuttle Walk Test Performed on a Treadmill Versus a Corridor in Patients With COPD

Spirometry tests will be performed using ULTIMA CPX equipment. Volunteers will perform the tests twice, on different days (see protocol description), in a corridor and on a treadmill, until reaching their limit of tolerance. In the test performed on the treadmill and in the one performed in the corridor, subjects will simultaneously use the VO 2000. And the volunteers will fill out the Saint George's Respiratory Questionnaire (SGRQ).