AI Article Synopsis
- The study aimed to compare bioelectrical signals of motor units in muscles from healthy individuals, myopathy patients, and those with motor neuron disease.
- Electrophysiologic tests were conducted on the biceps brachii at two different sites to analyze multi-motor unit potentials (MUPs) and other metrics.
- Results showed that recordings taken closer to the tendon had longer duration, more phases, and smaller amplitudes in neurogenic muscles, but changing needle position didn’t help differentiate myogenic muscles.
Article Abstract
Introduction: The objective of this study was to compare the properties of bioelectrical signals of motor units recorded at different sites in the muscles of controls, patients with myopathy and patients with motor neuron disease (MND).
Methods: Five controls, 10 patients with myopathy and 11 patients with MND were included. Electrophysiologic tests were performed in the biceps brachii (BB) muscle from two recording sites. Site 1 was near the belly of the muscle and Site 2 was 5cm distal from Site 1, near the tendon. Multi-motor unit potential (MUP) analysis, jitter analysis, and peak number count were calculated from the signals recorded using a concentric needle electrode (CN).
Results: At Site 2, duration was longer, number of phases was higher and amplitudes were smaller in MUPs compared with those recorded at Site 1. This significant difference between recording site and patient groups was related to neurogenic muscles. Jitter analysis showed no significant difference except an intergroup difference between the patient groups and controls. The peak number calculated using the CN was greater when recorded from Site 1 in concordance with MUP analysis.
Conclusion: Duration of MUP was longer and amplitude was smaller when the recording electrode was placed distally along the muscle near the tendon in neurogenic muscles, probably related to increased temporal dispersion. However, changing the position of the needle did not provide further information in distinguishing myogenic muscles.
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| http://dx.doi.org/10.1016/j.neucli.2020.02.001 | DOI Listing |
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