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Multivariable Static Ankle Mechanical Impedance With Active Muscles.

Hyunglae Lee, Patrick Ho, Mohammad Rastgaar

    IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
    |October 11, 2013
    PubMed
    Summary
    This summary is machine-generated.

    This study quantifies human ankle mechanical impedance during muscle activation. Ankle stiffness increases with muscle activity, particularly in the sagittal plane, highlighting directional joint properties.

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    Area of Science:

    • Biomechanics
    • Human Motor Control
    • Robotics in Medicine

    Background:

    • Understanding ankle mechanical impedance is crucial for analyzing human locomotion and developing effective rehabilitation strategies.
    • Previous studies primarily focused on relaxed ankle states, limiting insights into active muscle contributions.
    • Characterizing the nonlinear, multivariable nature of ankle impedance in coupled degrees of freedom is complex.

    Purpose of the Study:

    • To quantify multivariable static ankle mechanical impedance during active muscle states.
    • To investigate how ankle stiffness varies with muscle activation in two coupled degrees of freedom (dorsiflexion-plantarflexion and inversion-eversion).
    • To explore the implications for assessing neuro-mechanical disorders.

    Main Methods:

    • Utilized a highly backdrivable therapeutic robot for precise, repetitive measurements.
    • Employed robust function approximation methods to characterize nonlinear torque-angle relationships.
    • Measured ankle impedance in 10 healthy subjects at 10% maximum voluntary contraction (MVC).

    Main Results:

    • Ankle stiffness is direction-dependent, weakest in inversion/eversion, consistent with relaxed states.
    • Activating single or antagonistic muscles significantly increased ankle stiffness in all directions.
    • Stiffness increased more in the sagittal plane than the frontal plane, accentuating the inversion/eversion weakness.
    • Observed stiffness increase deviated from simple muscle superposition, suggesting contributions from unmonitored muscles.

    Conclusions:

    • Muscle activation significantly alters ankle mechanical impedance, enhancing stiffness in a direction-dependent manner.
    • The findings underscore the complex interplay between muscles and joint mechanics, particularly in coupled movements.
    • This research provides a foundation for improved assessment of ankle function in neurological and musculoskeletal conditions.