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An EMG technique for measuring spinal loading during asymmetric lifting.

P Dolan1, I Kingma, M P De Looze

  • 1Department of Anatomy, University of Bristol, Southwell Street, BS2 8EJ, Bristol, UK. trish.dolan@bristol.ac.uk

Clinical Biomechanics (Bristol, Avon)
|March 29, 2001
PubMed
Summary

Calibration method does not affect erector spinae electromyographic (EMG) predictions of extensor moments during asymmetric lifting. Simple, sagittal-plane calibrations are sufficient for predicting spinal loading during complex tasks.

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Area of Science:

  • Biomechanics
  • Occupational Health
  • Ergonomics

Background:

  • Asymmetric lifting tasks are a significant risk factor for low back pain.
  • Accurate measurement of spinal loading is crucial for identifying injury risks.

Purpose of the Study:

  • Compare two erector spinae electromyographic (EMG) calibration methods for predicting extensor moments during asymmetric lifting.
  • Compare EMG-predicted moments with moments from a linked-segment model.

Main Methods:

  • Eight men performed asymmetric lifting tasks with varying loads and speeds.
  • Surface EMG, lumbar curvature, body segment movement, and ground reaction forces were recorded.
  • Extensor moments were calculated using an EMG model and a linked-segment model.

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Main Results:

  • EMG-predicted extensor moments increased with load and lifting speed.
  • Calibration method did not influence EMG-predicted moments.
  • EMG-predicted moments were higher than linked-segment model moments, especially at higher loads and speeds.

Conclusions:

  • Sagittal-plane EMG calibration is adequate for predicting extensor moments in asymmetric lifting.
  • Discrepancies between models may stem from anthropometric assumptions, data filtering, and unmeasured antagonistic muscle forces.
  • Improved spinal loading measurement can help identify work practices that pose a risk of injury.