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Updated: Feb 8, 2026

Electrophysiological Motor Unit Number Estimation MUNE Measuring Compound Muscle Action Potential CMAP in Mouse Hindlimb Muscles
Published on: September 25, 2015
Motor unit number estimation of human abductor hallucis from a compound muscle action potential scan
Xiaoyan Li1,2, Ya Zong1,2,3,4, Cliff S Klein3
1Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, Houston, Texas, USA.
Introduction:
This study performed motor unit number estimation (MUNE) of the abductor hallucis (AH) muscle from 16 healthy control participants on the basis of the compound muscle action potential (CMAP) scan.
Methods:
Muscle responses to electrical stimuli ranging from subthreshold to supramaximal intensity were recorded, and MUNE was determined from a model of the responses (MScanFit program).
Results:
The average CMAP amplitude and MUNE of the AH for the right and left sides combined were 19.6 ± 0.75 mV and 127 ± 5 (mean ± SE), respectively.
Discussion:
Findings of the study provide useful information about the motor unit number of the AH. Muscle Nerve 58: 735-737, 2018.
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