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Respiratory Muscle Endurance Training in Chronic Obstructive Pulmonary Disease Impact on Exercise Capacity, Dyspnea, and Quality of Life THOMAS A. SCHERER, CHRISTINA M. SPENGLER, DOMINIK OWASSAPIAN, EDELBERT IMHOF, and URS BOUTELLIER Department of Internal Medicine, Triemli Hospital, Zurich, and Department of Exercise Physiology, Federal Institute of Technologyand University of Zurich, Swit