During the first laboratory visit,
spirometry was performed to determine disease severity and patients were asked to fill out questionnaires including: a form to list medications and comorbidities, the Medical Outcomes Study Short Form-36 (SF-36), the short form of McGill Pain Questionnaire (MPQ), the short form of the Brief Pain Inventory (BPI), and a form for screening the risks of exercise based on American College of Sports Medicine (ACSM) guidelines. Height and weight were measured, and each subject performed the 6MWT