Decrease in back strength in asymmetric trunk postures

P. Vink, H. A M Daanen, W. J. Meijst, J. Ligteringen

Research output: Contribution to JournalArticleAcademicpeer-review

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 whichit 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 forcein different asymmetric postures can be explained by length of the muscle, the activation of the muscle, and the moment angle of the muscle.

Original languageEnglish
Pages (from-to)405-416
Number of pages12
JournalErgonomics
Volume35
Issue number4
DOIs
Publication statusPublished - 1992

Keywords

  • Asymmetry
  • Back muscles
  • EMG
  • Muscle length
  • Static
  • Strength

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