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Related Experiment Video

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A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
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Quantification of Upper Limb Isometric Force Control Abilities for Evaluating Upper Limb Functions Among Prosthetic

Jae Hyung Lee, Ye Eun Oh, Hyun Joo Lee

    IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
    |December 7, 2021
    PubMed
    Summary

    Prosthetic users exhibit poorer upper limb isometric force control than healthy individuals, showing increased instability and variability. This highlights the need for better evaluation tools and targeted training for prosthetic users.

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    Area of Science:

    • Rehabilitation Engineering
    • Biomechanics
    • Neuroprosthetics

    Background:

    • Effective human-object interaction relies on precise force control.
    • Current methods for assessing upper limb function in prosthetic users are limited.
    • Standardized tools are needed to evaluate force control in individuals with limb loss.

    Purpose of the Study:

    • To quantify and compare upper limb isometric force control abilities in healthy individuals and prosthetic users.
    • To introduce and validate a novel testing device, the Upper Limb End-effector type Force control test device (ULEF).
    • To investigate differences in force control, variability, and muscle activation between groups.

    Main Methods:

    • Development of a custom ULEF device with a 6-axis force/torque sensor and visual feedback.
    • Testing with healthy subjects and individuals with transradial or wrist amputations using myoelectric prosthetic hands.
    • Analysis of isometric force control, force-generating rates, and electromyography (EMG) of biceps brachii.

    Main Results:

    • Prosthetic users demonstrated significantly higher control instability in lateral force tasks compared to healthy individuals.
    • Greater variability in force-generating rates across all directions was observed in the prosthetic user group.
    • Prosthetic users exhibited reduced peak biceps activity during anterior and posterior force tasks.

    Conclusions:

    • The ULEF device effectively quantifies isometric force control abilities in upper limb amputees.
    • Prosthetic users show deficits in force control, characterized by instability and variability.
    • Findings can inform the development of advanced evaluation tools, targeted training programs, and improved prosthetic designs.