Needle EMG of the human diaphragm: power spectral analysis in normal subjects

Muscle & Nerve
R ChenC F Bolton

Abstract

Needle EMG of the diaphragm was performed in 43 diaphragms in 23 healthy volunteers. The mean +/- standard deviation for the median frequency (MF) of the power spectrum was 233.3 +/- 58.1 Hz. The MF increased with age and showed a negative correlation with the forced vital capacity (FVC), but there was no correlation with other anthropometric measures or the results of phrenic nerve conduction study. The higher MF in older subjects may be due to early recruitment of larger units. The negative correlation between MF and FVC is likely secondary to a lower level of contraction required for normal breathing in subjects with high FVC. The integrated EMG (iEMG) of each inspiration strongly correlated with the tidal volume and the duration of inspiration. Power spectral analysis of diaphragmatic EMG is feasible and reliable. It can be used to assess respiratory muscle fatigue and may help in the diagnosis of neuromuscular disorders affecting the diaphragm.

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Citations

Jun 17, 1998·Muscle & Nerve·M J McKeown, C F Bolton
Dec 11, 2007·Muscle & Nerve·Simon Podnar, Anita Resman-Gaspersic
Sep 30, 2016·Muscle & Nerve·Zachary N London
Aug 4, 2015·The Journal of Comparative Neurology·Hari H SubramanianGert Holstege
Apr 9, 1998·The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques·U A Zifko
May 25, 2010·Journal of Oral Rehabilitation·E SuzukiM Uchida
Mar 10, 2020·Journal of Voice : Official Journal of the Voice Foundation·Hari H SubramanianGert Holstege

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