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Related Experiment Videos

Postural control during lifting.

Josef Kollmitzer1, L Oddsson, G R Ebenbichler

  • 1Department of Physical Medicine and Rehabilitation, University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria. josef.kollmitzer@akh-wien.ac.at

Journal of Biomechanics
|April 17, 2002
PubMed
Summary
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Manual material handling, like lifting, perturbs balance. Both parallel and step stances have pros and cons for postural control, with neither being definitively superior.

Area of Science:

  • Biomechanics
  • Human movement science
  • Ergonomics

Background:

  • Voluntary body movements inherently cause balance perturbations.
  • Manual material handling, particularly lifting, can exacerbate these balance disturbances.
  • Understanding how stance conditions affect postural control during lifting is crucial for injury prevention.

Purpose of the Study:

  • To investigate the effects of different stance conditions (parallel vs. step stance) on postural control during the lifting and lowering of a load.
  • To analyze the biomechanical strategies employed for maintaining balance under varying base-of-support conditions.

Main Methods:

  • Nineteen healthy subjects performed repetitive lifting and lowering tasks between a desk and a shelf.
  • The base of support was manipulated between parallel and step stance configurations.

Related Experiment Videos

  • Ground reaction forces and segmental kinematics were measured to assess postural responses.

    • Main Results:

    • Load transfer during lifting consistently perturbed balance in both stance conditions.
    • Parallel stance elicited sagittal plane movements and increased posterior shear forces.
    • Step stance offered greater anterior/posterior support but resulted in asymmetrical weight shifts and larger lateral shear forces.

    Conclusions:

    • Postural control mechanisms in the sagittal plane are less complex during step stance compared to parallel stance.
    • Lifting in step stance leads to greater lateral instability due to asymmetry.
    • Neither parallel nor step stance is universally superior for postural control during lifting; both have distinct advantages and disadvantages.