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.