Respiratory muscle weakness is common after stroke and is associated with activity limitation and respiratory complications. Studies of people who have had a stroke report that their inspiratory muscles can generate between 17 to 57 cmH2O pressure - much less than the ~100 cmH2O pressure in healthy adults. Similarly, the expiratory muscles can generate 25 to 68 cmH2O pressure, compared with ~120 cmH2O in healthy adults.