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Related Experiment Videos

Changes in trunk dynamics and spine loading during repeated trunk exertions

W S Marras1, K P Granata

  • 1Biodynamics Laboratory, Ohio State University, Columbus, USA.

Spine
|December 31, 1997
PubMed
Summary

Repetitive lifting changes how the spine is loaded. Over time, trunk motion decreases while hip motion increases, altering spinal loading and potentially increasing low back disorder risk.

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Area of Science:

  • Occupational biomechanics
  • Ergonomics
  • Spinal loading analysis

Background:

  • Limited research exists on how spine loading changes with repeated exposure to lifting tasks.
  • Previous studies focused on spine loading during specific, non-repetitive lifting actions.

Purpose of the Study:

  • To investigate changes in spine loading patterns during an extended period of repetitive manual materials handling.
  • To document the evolution of trunk and hip kinematics and spinal loads over a 5-hour lifting session.

Main Methods:

  • Ten experienced material handlers performed repetitive lifting tasks for 5 hours.
  • Trunk and hip kinematics, along with trunk muscle electromyography, were recorded during standard free-dynamic lifts.
  • An electromyography-assisted model estimated spine loading throughout the session.

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Main Results:

  • Significant changes in motion patterns were observed, with decreased trunk sagittal plane motion and increased hip motion.
  • Trunk moments decreased by 7%, accompanied by altered muscle recruitment patterns.
  • Spine compression decreased, while anterior/posterior shear forces increased.

Conclusions:

  • Spine loading patterns demonstrably change with repetitive lifting exposure.
  • Monitoring these dynamic changes is crucial for minimizing low back disorder risk in occupational settings.