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Decrease in back strength in asymmetric trunk postures.

Authors
Type
Published Article
Journal
Ergonomics
Publication Date
Volume
35
Issue
4
Pages
405–416
Identifiers
PMID: 1597172
Source
Medline
License
Unknown

Abstract

The extension force against resistance was recorded in 23 postures for 12 subjects to find explanations for the decrease in back strength in asymmetric postures. A reduction in muscle force in asymmetric postures was found up to 40%, but was strongly dependent on the plane in which asymmetry occurred, and on the posture to which it referred. A quantitative relationship between the forces exerted in different asymmetric postures is discussed, as a basis for formulating universal ergonomic guidelines for optimal working postures. The reduction in force in different asymmetric postures can be explained by length of the muscle, the activation of the muscle, and the moment angle of the muscle.

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