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Lumbar muscle activities in rapid three-dimensional pulling tasks

D G Thelen1, J A Ashton-Miller, A B Schultz

  • 1Department of Mechanical Engineering and Applied Mechanics, University of Michigan, USA.

Spine
|March 1, 1996
PubMed
Summary

Investigating three-dimensional pulling tasks revealed that asymmetric exertions significantly increase estimated spine compression due to additional muscle activation for stabilizing the trunk. This highlights the importance of considering trunk stiffness and multi-level equilibrium in understanding lumbar spine loads.

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Area of Science:

  • Biomechanics
  • Occupational Health
  • Musculoskeletal Research

Background:

  • Previous lumbar trunk load research primarily focused on static or sagittal plane movements.
  • Dynamic, three-dimensional (3D) trunk loading is less understood.
  • Understanding muscle recruitment in complex movements is crucial for ergonomics.

Purpose of the Study:

  • To investigate muscle recruitment patterns during rapid, 3D pulling tasks.
  • To estimate lumbar spine loads using myoelectric signals.
  • To compare spine loads between symmetric and asymmetric pulling exertions.

Main Methods:

  • Healthy young males performed 3D dynamic pulling tasks in various directions.
  • Myoelectric signals were recorded from 14 lumbar muscles.

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  • Muscle activity was compared to biomechanical capacity; spine loads were estimated using signal-to-force models.

    • Main Results:

    • Muscles with greater spatial effectiveness showed higher activity.
    • Oblique and latissimus dorsi muscles activated during tasks with lateral/axial moments, despite lower effectiveness.
    • Estimated spine compression was significantly higher during asymmetric pulls with twisting loads.

    Conclusions:

    • Asymmetric pulls activate muscles not directly involved in single-level moment equilibration.
    • Trunk stiffness and multi-level equilibrium requirements likely influence lumbar muscle activity during 3D loading.
    • Findings have implications for understanding and preventing work-related back injuries.