Anconeus motor unit number estimates using decomposition-based quantitative electromyography.

Abstract:

INTRODUCTION:Motor unit number estimates (MUNEs) provide important information in health, aging, and disease, and can be determined using decomposition-enhanced spike-triggered averaging (DE-STA). Discrimination of surface-detected motor unit potentials (S-MUPs) has been limited to contractile forces of ∽30% maximum voluntary contraction (MVC), which is insufficient to recruit a representative sample of the entire MU pool in most muscles. Unique features of the anconeus may permit MUNEs at high muscle activation levels. METHODS:In 10 men (25 ± 3 years), anconeus MUNEs were performed using DE-STA at 10%, 30%, and 50% root-mean-square of MVC (RMS(MVC)). RESULTS:The mean compound muscle action potential of the anconeus was ∽6 mV, and average S-MUP amplitudes were ∽100 μV, 145 μV, and 235 μV at 10%, 30%, and 50% RMS(MVC), resulting in low average MUNEs of 58, 38, and 25, respectively. CONCLUSIONS:Elbow extensor force-EMG relationships suggest full recruitment of the anconeus MU pool at 50% RMS(MVC), thus providing a representative sample for MUNE.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Stevens DE,Harwood B,Power GA,Doherty TJ,Rice CL

doi

10.1002/mus.24092

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

52-9

issue

1

eissn

0148-639X

issn

1097-4598

journal_volume

50

pub_type

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