Effect of expiratory muscle training on respiratory muscle fatigue in healthy adults: a randomized controlled trial.
Toshiya Tsukamoto, Hitoshi Maruyama
PMID 38952458WHAT IT FOUND
Expiratory muscle training in healthy young men raised breath-out pressure and reduced pressure drops during a breathing load.
It did not test people with COPD or respiratory illness.
Key findings
014-week expiratory muscle training increased maximum expiratory mouth pressure in the training group from 108.0 to 130.1 cmH2O, and the after-training value was higher than controls.
02After training, the training group did not show significant decreases in maximum inspiratory or expiratory mouth pressure during or after inspiratory loading, while controls did.
03In the training group, the surface EMG fatigue index did not show a significant time-course change after training, whereas before training it showed fatigue-related changes in the sternocleidomastoid, rectus abdominis, external oblique, and internal oblique.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study was done only in healthy adult males aged 20 to 40, so it does not show effects in women, older adults, or people with COPD or chronic respiratory illness. The sample was small: 15 in the training group and 16 controls, with no dropouts. The trial was nonblinded, and investigators assigned participants using a simple random number table. Mouth-pressure tests include elastic forces from the lung and chest and may involve air leaks, so they do not isolate individual respiratory muscle strength. The study did not investigate thorax movement or flexibility, and it did not capture respiratory muscle fatigue in COPD or chronic respiratory illness.
Declared interests
This research was supported by JSPS KAKENHI grant number 20K19431. The authors declared no conflict of interest.
The easy way to misread this
Do not read this as evidence that expiratory muscle training treats COPD or chronic respiratory illness. The trial enrolled only healthy adult males, and the authors state that respiratory muscle fatigue in COPD and chronic respiratory illness was not captured.