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Related Experiment Videos

Precision-grip force changes in the anatomical and prosthetic limb during predictable load increases.

D L Weeks1, S A Wallace, J T Noteboom

  • 1Department of Physical Therapy, Regis University, Denver, CO, USA.

Experimental Brain Research
|July 7, 2000
PubMed
Summary

Grip force control adapts to predictable weight changes, even with prosthetic devices. Sensory feedback is crucial for full adaptation, highlighting the importance of residual limb information for prosthetic hand users.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Rehabilitation Engineering

Background:

  • Understanding grip force control is essential for daily activities.
  • Investigating how individuals adapt grip force to changing loads, particularly with prosthetic devices, is critical for improving function.

Purpose of the Study:

  • To examine anticipatory and adaptive grip force adjustments in response to predictable load variations.
  • To compare grip force control in anatomical hands versus a prosthetic hand, and assess the role of sensory feedback.

Main Methods:

  • Precision grip force was measured using an instrumented test object.
  • Predictable loads (50, 100, 200 g) were added to the object.
  • Grip force was analyzed in non-amputee controls and a prosthetic user (anatomical and prosthetic hand).

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  • Load transport was performed by the subject or experimenter.

    • Main Results:

    • Anticipatory grip force changes occurred in both anatomical and prosthetic hands, scaled to load.
    • When the experimenter transported the load, anticipatory grip force increases were observed in anatomical hands but absent in the prosthetic hand.
    • During load assumption, grip forces were scaled to load demands in both anatomical and prosthetic hands.
    • Prosthetic hand grip force adaptation suggested utilization of residual limb sensory information.

    Conclusions:

    • Anticipatory grip force changes precede adaptation to load variations.
    • Actual sensory feedback from added weight is necessary for full grip force adaptation, even for prosthetic users.
    • Sensory information from the residual limb plays a role in grip force adaptation for prosthetic hand users.