Gass R, et al. - This study assessed the impacts of 2 intensities of expiratory positive airway pressure (EPAP) during exercise on tolerance, dynamic hyperinflation, and dyspnea in subjects with moderate to very severe COPD. A progressive attenuation in exercise tolerance and no improvement in dyspnea or dynamic hyperinflation at equivalent exercise duration were the reported consequences of the application of EPAP with 5 cm H₂O (EPAP5) or EPAP with 10 cm H₂O (EPAP10) during exercise.