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Related Experiment Video

Updated: May 24, 2025

Home-Based Monitor for Gait and Activity Analysis
07:24

Home-Based Monitor for Gait and Activity Analysis

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A Wearable Device for Ankle Impedance Estimation During Walking.

Keisuke Yagi

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |March 5, 2025
    PubMed
    Summary

    This study introduces a wearable device to measure ankle joint impedance during walking. The novel boots-type device accurately estimates impedance changes throughout the gait cycle.

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    Area of Science:

    • Biomechanics
    • Wearable Technology
    • Robotics

    Background:

    • Ankle joint impedance is crucial for gait stability and adaptability.
    • Accurate estimation of dynamic ankle impedance during locomotion is challenging.
    • Existing methods may disrupt natural gait or lack real-time capabilities.

    Purpose of the Study:

    • To propose and validate a novel wearable device for estimating ankle joint impedance during the gait cycle.
    • To assess the device's ability to capture gait-cycle-dependent impedance modulations.
    • To ensure minimal disruption to natural walking patterns.

    Main Methods:

    • Development of a boots-type wearable perturbator with a geared DC motor aligned to the ankle's dorsi-plantar flexion axis.
    • Application of a binary torque command for controlled perturbations.
    • Extraction of dynamic ankle responses using high-pass filtering on recorded motion data.
    • Estimation of ankle impedance via the least squares method.

    Main Results:

    • The wearable device successfully estimated ankle joint impedance modulated by the gait cycle.
    • Experimental validation with four healthy male participants confirmed the device's efficacy.
    • The device demonstrated minimal disruption to natural walking.

    Conclusions:

    • The proposed wearable perturbator is a viable tool for in-vivo ankle impedance estimation during walking.
    • This technology can advance research in gait biomechanics and the development of assistive devices.
    • The device's design facilitates natural movement while enabling precise impedance measurement.