Abstract
Background:
There is a report that improvement of shortness of breath is seen when respiratory muscle training is used in combination, but it is not clarified whether it is due to decrease of respiratory center output or increase of peripheral respiratory muscle force. Therefore, this study, using respiratory muscle training equipment for actual COPD patients, whether improvement of shortness of breath is recognized before and after training, and P0.1 measurements as index of respiratory center output is performed, and improvement is central determine whether it is peripheral.
Methods:
Fourteen stable outpatients with COPD participated in the study. Power Breeze was used for inspiratory muscle training equipment. Respiratory muscle strength was measured and started from a load of 30% of PImax, and 2 sets of 30 times a day were asked to perform inspiratory muscle training every day for 2 months. We measured mouth occlusion pressure (P0.1), respiratory muscle strength (PImax, PEmax), 6MWD (6-min walk distance) test, spirometry, ventilatory parameters and CAT before and after inspiratory muscle training. We also measured the movement and thickness of the diaphragm by ultrasound.
Results:
There were significantly increased PImax, PIpeak and P0.1/PImax after inspiratory muscle training (P<0.001). The walking distance was extended, and the diaphragm's extended distance also increased after training (P<0.01-0.001). However, P0.1 did not reduced significantly after training.
Conclusions:
Inspiratory muscle training improves respiratory muscle strength and 6MWD. This is considered to be peripheral function improvement, not central output. It seemed to be effective in pulmonary rehabilitation.
* p<0.05 **p<0.01 ***p<0.001 View all access options for this article.Results of each indicator before and after inspiratory muscle training
PImax***
PIpeak***
6MWD**
diaphragm expansion difference ***
P0.1/PImax*
before
89.8±29.1
66.4±24.0
354.7±118.6
0.03±0.02
3.7±0.6
after
115.5±18.8
84.0±21.3
384.0±119.4
0.02±0.01
4.9±0.8
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