Intramuscular pressure of the infra-and supraspinatus muscles in relation to hand load and arm posture

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Palmerud, G (author)

Intramuscular pressure of the infra-and supraspinatus muscles in relation to hand load and arm posture

Article/chapterEnglish2000

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Springer,2000
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LIBRIS-ID:oai:DiVA.org:kth-297038
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297038URI
https://doi.org/10.1007/s004210000282DOI

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Language:English
Summary in:English

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QC 20210616
In work engaging the upper extremities, the musculoskeletal system of the shoulder is sometimes exposed to prolonged excessive load, leading to musculoskeletal disorders of the shoulder. One way of reducing work-related shoulder disorders is to establish guidelines for working postures. The purpose of this study was to identify harmful working positions, by performing a comprehensive survey of the intramuscular pressure (IMP) in the infra- and supraspinatus muscles in relation to different arm positions and external loads. Ten healthy males participated, and the IMP in the infra- and supraspinatus muscles was studied in a total of 112 combinations of arm positions and hand loads at levels that occur frequently in industrial work. High-precision spatial recordings were accomplished with a three-dimensional motion-analysis system, and the IMP was measured using the microcapillary infusion technique. The mean IMP of the infraspinatus muscle as well as that of the supraspinatus muscle increased continuously from a resting pressure at 0° of upper arm elevation to a maximal pressure at 90° of upper arm elevation, for all elevation planes. The mean IMP of the supraspinatus muscle appeared to be more dependent upon the elevation plane and less dependent upon the hand load, compared to the infraspinatus muscle. Even during only moderate arm elevation, the mean IMP of the infra- and supraspinatus muscles, presented here in polar diagrams, had already exceeded the levels of reduced recovery from local muscle fatigue and blood flow impairment. The elevation angle and the hand load primarily influence the development of IMP in the infra- and supraspinatus muscles.

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Forsman, Mikael,ProfessorDepartment of Human Factors Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden(Swepub:kth)u1iq0ct2 (author)
Sporrong, H (author)
Herberts, P (author)
Kadefors, R (author)
Department of Human Factors Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden (creator_code:org_t)

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In:European Journal of Applied Physiology: Springer83:2-3, s. 223-2301439-63191439-6327

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MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Health Sciences; and Occupational Hea ...

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