Key result
Maximum voluntary ventilation maneuvers significantly decreased maximal inspiratory pressure, EMG amplitude, and median power frequency in the diaphragm and external intercostals (P0.05).
Why the study?
Does maximum voluntary ventilation induce inspiratory muscle fatigue detectable by surface EMG and cervical magnetic stimulation in healthy young men?
Does maximum voluntary ventilation induce inspiratory muscle fatigue detectable by surface EMG and cervical magnetic stimulation in healthy young men?
Surface EMG recordings of the diaphragm during maximal static inspiratory efforts and in response to cervical magnetic stimulation allow reproducible assessment of diaphragm contractility and fatigue.
Answers are grounded in this paper and cite their sources.
Validates surface EMG for detecting MVV-induced inspiratory fatigue in healthy men; leaves open extension to clinical populations.
This study was designed: (1) to test the reliability of surface electromyography (sEMG) recording of the diaphragm and external intercostals contractions response to cervical magnetic stimulation (CMS), (2) to examine the amount and the types of inspiratory muscle fatigue that developed after maximum voluntary ventilation (MVV) maneuvers.Ten male college students without physical disability (22.1±2.0 years old) participated in the study and each completed a control (quiet breathing) trial and a fatigue (MVV maneuvers) trial sequentially. In the quiet breathing trial, the subjects maintained quiet breathing for five minutes. The subjects performed five maximal static inspiratory efforts and received five CMS before and after the quiet breathing. In the MVV trial, subjects performed five maximal inspiratory efforts and received five CMS before, immediately after, and ten minutes after two sets of MVV maneuvers performed five minutes apart. Maximal inspiratory pressure (PImax), sEMG of diaphragm and external intercostals during maximal static inspiratory efforts and during CMS were recorded. In the quiet breathing trial, high intraclass correlation coefficients (ICC=0.95-0.99) were observed in all the variables. In the MVV trial, the PImax, the EMG amplitude and the median power frequency during maximal static inspiratory efforts significantly decreased in both the diaphragm and the external intercostals immediately after the MVV maneuvers (P0.05). It is concluded that the sEMG recordings of the diaphragm during maximal static inspiratory efforts and in response to CMS allow reproducible sequential assessment of diaphragm contractility. MVV maneuvers resulted in inspiratory muscles fatigue, possibly central fatigue.
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Chien et al. (2008) studied Healthy (n=10). Maximum voluntary ventilation (MVV) maneuvers vs. Quiet breathing was evaluated on Maximal inspiratory pressure (PImax), EMG amplitude, and median power frequency (p=0.05). Maximum voluntary ventilation maneuvers significantly decreased maximal inspiratory pressure, EMG amplitude, and median power frequency in the diaphragm and external intercostals (P0.05).
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