2019
DOI: 10.1002/mus.26718
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The motor unit and quantitative electromyography

Abstract: Electromyography (EMG) assesses the anatomic motor unit (A-MU), but knowledge of its anatomy, physiology, and changes with pathology is limited. The electrophysiological motor unit (E-MU) and its motor unit potential (E-MUP) represents a fraction of the A-MU. Routine EMG assesses a limited number of E-MUP waveform characteristics (metrics) and their magnitudes qualitatively scaled in a nonlinear manner.Another approach is quantitative EMG (QEMG), whereby 20 + E-MUPs are extracted and both basic and derived met… Show more

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Cited by 11 publications
(5 citation statements)
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References 92 publications
(134 reference statements)
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“…It is well known that elderly are at more risk of peripheral nerve dysfunction due to processes of denervation that occur with normal aging at accelerated rate beyond 60 years of age, and so, it may be difficult to discriminate the effects of normal aging from pathological conditions [19][20][21].…”
Section: Discussionmentioning
confidence: 99%
“…It is well known that elderly are at more risk of peripheral nerve dysfunction due to processes of denervation that occur with normal aging at accelerated rate beyond 60 years of age, and so, it may be difficult to discriminate the effects of normal aging from pathological conditions [19][20][21].…”
Section: Discussionmentioning
confidence: 99%
“…Regarding EMG, it is widely used in the diagnostic workup in myositis patients 13‐15 . Furthermore, it has been shown that also EMG findings can quantitatively reflect muscle alteration 13 .…”
Section: Discussionmentioning
confidence: 99%
“…One important diagnostic modality in clinical neurology practice is EMG 13‐15 . It can be used to detect pathological spontaneous activity (PSA) and to analyze motor unit potentials (MUP) 13 .…”
Section: Introductionmentioning
confidence: 99%
“…The signal recorded during muscle contraction comprises the motor unit action potential (MUAP), which can be detected from muscles in the volitional state. In a clinical setting, neuropathy and myopathy are difficult to discern because their symptoms can be significantly similar and overlap in some cases, and MUAP plays a significant role in distinguishing them [1,[5][6][7][8][9][10][11][12]. Patients with peripheral neuropathy commonly exhibit MUAPs with high amplitudes, long durations, and reduced recruitment, whereas those with myopathy commonly exhibit MUAPs with small amplitudes, short durations, and early recruitment [1,[5][6][7][8][9][10][11][12].…”
Section: Introductionmentioning
confidence: 99%