Exercise performance in chronic obstructive pulmonary diseases.

摘要: Patients with chronic obstructive pulmonary diseases demonstrate exercise limitation as a consequence of both an increased ventilatory requirement and decreased capacity. The arises from the elevated wasted ventilation fraction each breath (VD/VT) hypoxemia secondary to ventilation-perfusion mismatching, which stimulate minute increase. reduced capacity is primarily result airflow obstruction, causes work breathing. Respiratory muscle fatigue may also play role in reducing differentiation heart failure cause dyspnea can be accomplished using variety noninvasive invasive techniques during exercise, including measurements ventilation, expiratory pattern, reserve (VEmax/MVV), efficiency (VD/VT), arterial blood gases, anaerobic threshold, rate, cardiac output, hemodynamics ventricular ejection fraction. Exercise training patients improves intolerance but appears have little effect on function tests, gases hemodynamics. Supplemental oxygen useful adjunct for improving tolerance diseases.