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Application of isometric load on a facial muscle - The zygomaticus major

Cited 1 time in Web of Science Cited 1 time in Scopus
Authors
Kim, Kyoung-Eun; Oh, Seung Ha; Lee, Shi-Uk; Chung, Sun G.
Issue Date
2009-10
Publisher
ELSEVIER SCI LTD
Citation
CLINICAL BIOMECHANICS; Vol.24 8; 606-612
Keywords
Facial palsyNeuromuscular electrical stimulationIsometric contractionLoad
Abstract
Background: As an initial step to study facial muscle strengthening by loaded neuromuscular electrical stimulation, we examined the feasibility of applying load to the zygomaticus major. quantified the maximal isometric force of the muscle by volition and electrical stimulation, and compared the measured forces with the results of facial kinematic analysis and electrodiagnostic study. Methods: Eleven healthy subjects and two female patients with chronic unilateral facial palsy were enrolled. A custom made plastic bridge instrument with a centrally mounted load cell was attached at the mouth angle and to the skin overlying the zygomatic bone using double-sided adhesive tape to provide isometric resistance to skin movement during the muscle contraction. Findings: The force by maximal voluntary contraction of the zygomaticus major averaged 196.4 g force and the contraction force by maximally tolerated stimulation reached 60.1%, on average, of the force by maximal voluntary contraction in normal subjects. There was a significant correlation only between the force by maximally tolerated stimulation and the amplitude of compound muscle action potentials. The force by maximal voluntary contraction of the paralytic side in the patients showed 32.3% and 20.1% of the mean value of the normal subjects. Interpretations: This study demonstrates that an isometric load was possibly applied and a significant intensity of electrical stimulation could be tolerated and delivered to the isometrically loaded facial muscle. The isometric loading would be utilized for loaded facial neuromuscular electrical stimulation therapeutically and also for measurement of the force generation capacity of the zygomaticus major diagnostically. (C) 2009 Elsevier Ltd. All rights reserved.
ISSN
0268-0033
Language
English
URI
http://hdl.handle.net/10371/78588
DOI
https://doi.org/10.1016/j.clinbiomech.2009.06.008
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College of Medicine/School of Medicine (의과대학/대학원)Rehabilitation Medicine (재활의학전공)Journal Papers (저널논문_재활의학전공)
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