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Updated: Aug 23, 2026

An Implantable System For Chronic In Vivo Electromyography
Published on: April 21, 2020
Laryngeal electromyography in normal Brazilian population
P A T Kimaid1, A N Crespo, E M A B Quagliato
1Service of Neurology, UNICAMP School of Medicine, UNICAMP, Brazil.
Abstract:
Quantitative analysis of normal values of motor unit action potentials duration and amplitude of muscles tireoaritenoideus (TA), cricotireoideus (CT), cricoaritenoideus lateralis (CAL), and cricoaritenoideus posterioris (CAP) was performed in 14 adult normal Brazilian volunteers. The recordings were obtained by percutaneously inserted concentric needle electrode. Different motor unit action potentials were manually selected in each muscle for quantitative computerized analysis of duration and amplitude. The mean values for duration and amplitude were respectively 3.8 ms and 413 microV for TA, 4.9 ms and 585 microV for CT 4.1 ms and 388 microV for CAL and 4.5 ms and 475 microV in CAP. There were no similar reports of normal values of motor unit action potentials in Brazilian subjects.
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