Journal article
Motor unit number index: Guidelines for recording signals and their analysis.
- Nandedkar SD Natus Medical Incorporated, Hopewell Junction, New York, USA.
- Barkhaus PE Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
- Stålberg EV University Hospital, Uppsala, Sweden.
- Neuwirth C Kantonsspital St Gallen, St Gallen, Switzerland.
- Weber M Kantonsspital St Gallen, St Gallen, Switzerland.
- 2018-02-11
Published in:
- Muscle & nerve. - 2018
MUNIX
artifacts
compound muscle action potential
guidelines
motor unit number index
surface EMG interference pattern
tremor
Action Potentials
Adult
Aged
Electromyography
Female
Humans
Male
Middle Aged
Motor Neurons
Recruitment, Neurophysiological
Time Factors
English
INTRODUCTION
This study proposes guidelines for motor unit number index (MUNIX) recording and analysis.
METHODS
MUNIX was measured in control participants and in patients with amyotrophic lateral sclerosis. Changes in MUNIX values due to E1 electrode position, number of surface electromyography interference pattern (SIP) epochs, SIP epoch duration, force of contraction, and outlier data points were investigated.
RESULTS
MUNIX depends on optimized compound muscle action potential (CMAP) amplitude. Individual muscles showed variations when the number of epochs was low or when the SIP duration was short. Longer SIP duration allowed better recognition of artifacts. MUNIX results were affected by SIP values at all force levels but was more affected when SIP area was low.
DISCUSSION
We recommend changing the E1 electrode position to maximize CMAP amplitude. Twenty or more SIP signals of 500-ms duration should be recorded by using force levels ranging from slight to maximum. Traces should be reviewed to identify and exclude signals with tremor or solitary spikes. Muscle Nerve 58: 374-380, 2018.
This study proposes guidelines for motor unit number index (MUNIX) recording and analysis.
METHODS
MUNIX was measured in control participants and in patients with amyotrophic lateral sclerosis. Changes in MUNIX values due to E1 electrode position, number of surface electromyography interference pattern (SIP) epochs, SIP epoch duration, force of contraction, and outlier data points were investigated.
RESULTS
MUNIX depends on optimized compound muscle action potential (CMAP) amplitude. Individual muscles showed variations when the number of epochs was low or when the SIP duration was short. Longer SIP duration allowed better recognition of artifacts. MUNIX results were affected by SIP values at all force levels but was more affected when SIP area was low.
DISCUSSION
We recommend changing the E1 electrode position to maximize CMAP amplitude. Twenty or more SIP signals of 500-ms duration should be recorded by using force levels ranging from slight to maximum. Traces should be reviewed to identify and exclude signals with tremor or solitary spikes. Muscle Nerve 58: 374-380, 2018.
- Language
-
- English
- Open access status
- closed
- Identifiers
-
- DOI 10.1002/mus.26099
- PMID 29427557
- Persistent URL
- https://folia.unifr.ch/global/documents/96257
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