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Related Experiment Videos

Spine loading during asymmetric lifting using one versus two hands

W S Marras1, K G Davis

  • 1Biodynamics Laboratory, Ohio State University, Columbus 43210, USA.

Ergonomics
|June 18, 1998
PubMed
Summary
This summary is machine-generated.

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Asymmetric lifting increases spinal forces, with left-sided lifts causing greater compression and shear than right-sided lifts. One-hand lifting alters spinal loading, impacting workplace safety and task design.

Area of Science:

  • Biomechanics
  • Occupational Health
  • Ergonomics

Background:

  • Asymmetric lifting tasks are common in many workplaces.
  • Understanding three-dimensional spinal loading is crucial for preventing injuries.

Purpose of the Study:

  • To document three-dimensional spinal loading during asymmetric lifting using one or two hands.
  • To compare spinal loads between left-sided and right-sided lifts.
  • To analyze the effects of one-hand versus two-hand lifting on spinal forces.

Main Methods:

  • Ten subjects performed asymmetric lifts of a 13.7 kg box from various origins (0, 30, 60 degrees off sagittal plane).
  • Lifts were performed using one or two hands.
  • Spinal loads were estimated using a validated EMG-assisted biomechanical model.

Related Experiment Videos

Main Results:

  • Spine compression and lateral shear forces increased with lift asymmetry.
  • Left-sided lifts resulted in approximately twice the increase in compression and lateral shear compared to right-sided lifts.
  • Anterior-posterior shear decreased with asymmetry, particularly for right-sided lifts.
  • One-hand lifts, using the hand ipsilateral to the load, produced compression forces similar to symmetric two-hand lifts, with altered shear forces.

Conclusions:

  • Lift asymmetry significantly increases spinal compression and lateral shear forces.
  • The direction of asymmetry (left vs. right) critically influences spinal loading magnitudes.
  • One-hand lifting strategies can modify spinal loading profiles, presenting both risks and potential benefits.
  • Findings have implications for ergonomic assessments, injury prevention, and workplace design.