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- Publisher Website: 10.1111/joor.13115
- Scopus: eid_2-s2.0-85094665684
- PMID: 33068481
- WOS: WOS:000583212000001
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Article: Functional properties of single motor units in the human medial pterygoid muscle: Thresholds
Title | Functional properties of single motor units in the human medial pterygoid muscle: Thresholds |
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Authors | |
Keywords | motor activity single motor unit medial pterygoid muscle functional heterogeneity electromyography |
Issue Date | 2021 |
Citation | Journal of Oral Rehabilitation, 2021, v. 48, n. 2, p. 132-142 How to Cite? |
Abstract | © 2020 John Wiley & Sons Ltd Background: Little is known regarding the functional properties of single motor units (SMUs) in the medial pterygoid muscle (MPt) during jaw movements. Objectives: The aims are (a) to report the thresholds of onset of MPt SMUs during 4 goal-directed jaw movement tasks, and (b) to determine whether the threshold of onset of SMU activation varies with the velocity of jaw movement and the location within the muscle. Methods: Intra-muscular electrodes were inserted in the right MPt of 18 participants performing ipsilateral (right), contralateral, protrusive and opening-closing jaw movements recorded at 2 velocities. Task phases were as follows: BEFORE, OUT, HOLDING, RETURN and AFTER. SMU onset thresholds were determined from the displacement (mm) of the lower mid-incisor point. Electrode location within 4 arbitrary muscle divisions was determined with computer tomography. Statistical tests: Spearman's correlations, Kruskal-Wallis tests; significance accepted at P <.05. Results: A significant inverse relation occurred between velocity and threshold for the RETURN of the ipsilateral movement (n = 62 SMU thresholds), while a significant positive relation occurred for the OUT of the contralateral movement (n = 208); there were no significant associations for the protrusive (n = 131) and opening-closing (n = 58) tasks. Significant threshold differences occurred across the 4 muscle divisions only during the OUT of the contralateral and protrusive movements. Some evidence was provided for gender differences in MPt SMU properties. Conclusions: The absence of a significant inverse relation between velocity and SMU threshold for most recorded movements suggests the MPt acts as a stabilizer of the jaw in horizontal and opening-closing jaw movements. |
Persistent Identifier | http://hdl.handle.net/10722/297310 |
ISSN | 2023 Impact Factor: 3.1 2023 SCImago Journal Rankings: 0.958 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Chen, Hui | - |
dc.contributor.author | Whittle, Terry | - |
dc.contributor.author | Gal, John | - |
dc.contributor.author | Klineberg, Iven J. | - |
dc.contributor.author | Murray, Greg M. | - |
dc.date.accessioned | 2021-03-15T07:33:29Z | - |
dc.date.available | 2021-03-15T07:33:29Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Journal of Oral Rehabilitation, 2021, v. 48, n. 2, p. 132-142 | - |
dc.identifier.issn | 0305-182X | - |
dc.identifier.uri | http://hdl.handle.net/10722/297310 | - |
dc.description.abstract | © 2020 John Wiley & Sons Ltd Background: Little is known regarding the functional properties of single motor units (SMUs) in the medial pterygoid muscle (MPt) during jaw movements. Objectives: The aims are (a) to report the thresholds of onset of MPt SMUs during 4 goal-directed jaw movement tasks, and (b) to determine whether the threshold of onset of SMU activation varies with the velocity of jaw movement and the location within the muscle. Methods: Intra-muscular electrodes were inserted in the right MPt of 18 participants performing ipsilateral (right), contralateral, protrusive and opening-closing jaw movements recorded at 2 velocities. Task phases were as follows: BEFORE, OUT, HOLDING, RETURN and AFTER. SMU onset thresholds were determined from the displacement (mm) of the lower mid-incisor point. Electrode location within 4 arbitrary muscle divisions was determined with computer tomography. Statistical tests: Spearman's correlations, Kruskal-Wallis tests; significance accepted at P <.05. Results: A significant inverse relation occurred between velocity and threshold for the RETURN of the ipsilateral movement (n = 62 SMU thresholds), while a significant positive relation occurred for the OUT of the contralateral movement (n = 208); there were no significant associations for the protrusive (n = 131) and opening-closing (n = 58) tasks. Significant threshold differences occurred across the 4 muscle divisions only during the OUT of the contralateral and protrusive movements. Some evidence was provided for gender differences in MPt SMU properties. Conclusions: The absence of a significant inverse relation between velocity and SMU threshold for most recorded movements suggests the MPt acts as a stabilizer of the jaw in horizontal and opening-closing jaw movements. | - |
dc.language | eng | - |
dc.relation.ispartof | Journal of Oral Rehabilitation | - |
dc.subject | motor activity | - |
dc.subject | single motor unit | - |
dc.subject | medial pterygoid muscle | - |
dc.subject | functional heterogeneity | - |
dc.subject | electromyography | - |
dc.title | Functional properties of single motor units in the human medial pterygoid muscle: Thresholds | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1111/joor.13115 | - |
dc.identifier.pmid | 33068481 | - |
dc.identifier.scopus | eid_2-s2.0-85094665684 | - |
dc.identifier.volume | 48 | - |
dc.identifier.issue | 2 | - |
dc.identifier.spage | 132 | - |
dc.identifier.epage | 142 | - |
dc.identifier.eissn | 1365-2842 | - |
dc.identifier.isi | WOS:000583212000001 | - |
dc.identifier.issnl | 0305-182X | - |