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Pursed lip breathing (PLB) is known to improve oxygenation by controlled ventilation. In COPD, PLB is adopted as a compensatory mechanism to maintain the patency of airways by creating a back pressure in airways. Objective: To find the effectiveness of Pursed lip breathing (PLB) on Physiological cost index (PCI) and functional exercise capacity in patients having COPD. Study design: This experimental study was carried out with one group pre test - post test design. Procedure: Thirty patientsdoi:10.37896/ymer21.03/28 fatcat:kgtkv2gk6vgjbeai4vrjaiul5m