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Related Experiment Videos

Estimation of spinal loads in overhead work

A K Burton1, K M Tillotson, M G Boocock

  • 1Spinal Research Unit, School of Human and Health Sciences, University of Huddersfield, UK.

Ergonomics
|August 1, 1994
PubMed
Summary

Overhead work involves lumbar extension, but spinal strain is minimal. Current ergonomic interventions for overhead tasks may not be necessary for reducing spinal loading.

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Ergonomics·2007

Area of Science:

  • Occupational Health
  • Biomechanics
  • Ergonomics

Background:

  • Overhead working postures are common in motor vehicle maintenance.
  • Lumbar extension during overhead work can potentially lead to spinal strain.

Purpose of the Study:

  • To quantify spinal loads during overhead work.
  • To evaluate the effectiveness of ergonomic interventions for reducing lumbar extension.

Main Methods:

  • A field study identified typical lumbar extension in mechanics.
  • Laboratory experiments measured lumbar posture, ground reaction forces, and stature change in simulated tasks.
  • Eight male volunteers performed overhead and chest-height bolt tasks.

Main Results:

  • Motor mechanics spend 8% of time overhead with up to 10° lumbar extension.
  • Overhead tasks increased lumbar extension and perceived exertion compared to chest-height tasks.
  • Stature changes were minimal and not significantly different between overhead and chest-height tasks.

Conclusions:

  • No evidence suggests a need for ergonomic intervention to reduce spinal loading in overhead work.
  • Dynamic work elements may have an unloading effect.
  • Lordotic postures appear to reduce spinal disc load.

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