Mechanisms of Arterial Hypotension in Chronic Spinal Cord Injury

Assembled together using a T-shaped connector, a threshold Positive Expiratory Pressure Device (Respironics, Inc.) \& an Inspiratory Muscle Trainer (IMT, Respironics Inc.) with mouthpiece will be used. During inhalation, the subjects will initiate each breath from residual volume (RV) and to sustain the effort until their lungs feel full. During exhalation, the subjects will breathe from total lung capacity and sustain their effort until their lungs feel empty. Participants will be asked to train 45 minutes per day, 5 days per week, for 4 weeks. The training will be initiated with a load equal to 20% of their individual PImax and PEmax with progressive increases as tolerated up to 40% of their baseline PImax or PEmax.