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Updated: May 9, 2026
CMAP Scan MUNE MScan - A Novel Motor Unit Number Estimation MUNE Method
Published on: June 7, 2018
MScanFit and StairFit Motor Unit Number Estimation of the Extensor Digitorum Brevis and Abductor Digiti Minimi
Yanhui Zhang1, Maoqi Chen2, Peipei Xu3
1Department of Rehabilitation Sciences, Affiliated Hospital of Jiangxi University of Chinese Medicine, Nanchang, China.
Introduction/Aims:
MScanFit and StairFit are two motor unit number estimation (MUNE) methods derived from a compound muscle action potential (CMAP) scan. This study aims to compare MScanFit and StairFit MUNE values by applying both methods to the same muscles.
Methods:
CMAP scans were recorded from the extensor digitorum brevis (EDB) and abductor digiti minimi (ADM) muscles. MUNE was performed using the MScanFit and the StairFit programs.
Results:
Twenty healthy subjects (30.1 ± 6.6 years; 11 males, 9 females) participated in the study. The MScanFit and StairFit MUNE values were 79 ± 35 and 63 ± 20 for the EDB muscle, and 124 ± 33 and 80 ± 20 for the ADM muscle, respectively. The StairFit MUNE was significantly lower than the MScanFit MUNE (p < 0.05 for EDB, p < 0.01 for ADM).
Discussion:
The different results for MScanFit and StairFit MUNE are likely due to the different strategies used by the two methods. Serial studies are needed to further compare their performances in tracking motor unit number and size changes.
