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Decrease in back strength in asymmetric trunk postures.

P Vink1, H A Daanen, W J Meijst

  • 1TNO Institute of Preventive Health Care, Department of Posture and Movement Research, Leiden, The Netherlands.

Ergonomics
|April 1, 1992
PubMed
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Asymmetric postures can decrease back strength by up to 40%. This reduction in muscle force depends on the asymmetry

Area of Science:

  • Biomechanics
  • Ergonomics
  • Human Physiology

Background:

  • Reduced back strength is a concern in various occupational settings.
  • Asymmetric postures are common and may contribute to decreased muscle force.

Purpose of the Study:

  • To investigate the reduction in back extensor strength in asymmetric postures.
  • To identify factors influencing strength loss in non-neutral spinal positions.

Main Methods:

  • Measured extension force against resistance in 23 different postures.
  • Involved 12 healthy subjects performing the postural tasks.

Main Results:

  • Observed up to a 40% reduction in muscle force in asymmetric postures.
  • Strength reduction varied significantly based on the plane of asymmetry and specific posture.

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  • Identified muscle length, activation, and moment angle as key explanatory factors.

    • Conclusions:

    • Asymmetric postures significantly reduce back extensor strength.
    • Understanding the biomechanical factors is crucial for developing ergonomic guidelines.
    • Optimal working postures can be formulated based on quantitative relationships of forces in asymmetric positions.