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BACKGROUND Functional capacity assessment is important in patients with chronic obstructive pulmonary disease (COPD). It can be performed by the six-minute walk test (6MWT) on a 30-ms track. However, such space is not always available in clinical settings. OBJECTIVES To compare the performance between the 6MWT on a 30- (6MWT3 and 20-meter (6MWT2 track; to evaluate the validity and reliability of the 6MWT30 and the 6MWT20; and to determine for which patients track length has the greatest impact on performance. METHODS Patients with C