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Recruitment of low threshold motor-units in the trapezius muscle in different static arm positions
Lindholmen Development, Göteborg, Sweden.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.ORCID iD: 0000-0001-5777-4232
Karolinska University Hospital.
Sahlgrenska University Hospital.
1999 (English)In: Ergonomics, ISSN 0014-0139, E-ISSN 1366-5847, ISSN 0014-0139, Vol. 42, no 2, p. 359-375Article in journal (Refereed) Published
Abstract [en]

A prevailing hypothesis for development of myalgia symptoms in the trapezius muscle is based on observations that in stereotypic activation of muscle the same low-threshold motor-units are the first ones to be recruited, and that these units are active throughout the contraction, until total relaxation. The theory suggests that these units are the first ones in monotonous repetitive work to be subject to degenerative processes, causing pain. The present project was undertaken to evaluate to what extent recruitment of motor-units in the trapezius muscle is position-specific, i.e. if there are motor-units that are recruited over a wide range of arm postures. Fine wire electrode pairs, inserted 2 cm lateral to the midpoint between the acromion and the C7 spinous processus, were used for signal acquisition. Methods for decomposition of the interference patterns were developed, allowing identification of single motor-units in signals registered in different arm positions. Voluntary recruitment of motor-units in the descending portion of the trapezius muscle was studied in 24 different arm positions (0–90 shoulder flexion, 0–45 humeral abduction, and 45–135 elbow flexion) in three subjects. The results showed that the wire electrode technique and the signal processing algorithm employed allowed motor-unit identification in nonisometric conditions. It was found that low threshold motor-units in the trapezius muscle, active over a wide range of arm positions, could be identified in all three subjects. We refer to those as Cinderella, or C, units. These results support the research hypothesis addressed.

Place, publisher, year, edition, pages
Informa UK Limited , 1999. Vol. 42, no 2, p. 359-375
National Category
Physiology and Anatomy Occupational Health and Environmental Health Production Engineering, Human Work Science and Ergonomics
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URN: urn:nbn:se:kth:diva-311361DOI: 10.1080/001401399185711ISI: 000078341200008PubMedID: 10024852Scopus ID: 2-s2.0-0032927178OAI: oai:DiVA.org:kth-311361DiVA, id: diva2:1653824
Note

QC 20220503

Available from: 2022-04-25 Created: 2022-04-25 Last updated: 2025-02-10Bibliographically approved

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Forsman, Mikael

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