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Sensors 2008, 8(4), 2174-2187; doi:10.3390/s8042174

Assessment of Diaphragm and External Intercostals Fatigue from Surface EMG using Cervical Magnetic Stimulation

1
School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan
2
School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan
3
Department of Physical Therapy, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan Tao-Yuan 333, Taiwan
*
Author to whom correspondence should be addressed.
Received: 1 February 2008 / Accepted: 14 March 2008 / Published: 28 March 2008
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Abstract

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 (P<0.05) and remained decreased in the diaphragm but not in the external intercostals after ten minutes of recovery. MVV maneuvers induced no EMG changes during CMS in either the diaphragm or the external intercostals (P>0.05). 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. View Full-Text
Keywords: Surface electromyography; Diaphragm; Inspiratory muscle; Fatigue; Cervical magnetic stimulation Surface electromyography; Diaphragm; Inspiratory muscle; Fatigue; Cervical magnetic stimulation
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MDPI and ACS Style

Chien, M.-Y.; Wu, Y.-T.; Chang, Y.-J. Assessment of Diaphragm and External Intercostals Fatigue from Surface EMG using Cervical Magnetic Stimulation. Sensors 2008, 8, 2174-2187.

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