[Inspiratory muscle strength and endurance in patients with chronic obstructive pulmonary disease]

The maximal inspiratory pressure (MIP) and the sustainable inspiratory maximal pressure (SIPm) in 79 patients with chronic obstructive pulmonary disease (COPD) which were divided into the mild group (MG) and the mid-severe group (MSG) were measured. The results showed that MIP and SIPm were significantly lower in MSG than the prediction and in MG, the inspiratory fatigue in MSG was taken place in lower load and shorter time. We considered: MIP and SIPm fallen significantly in COPD patients might play a very important role in developing patients' respiratory failure.