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Recovery response latencies to tripping perturbations during gait decrease with practice.

A Forner-Cordero, F C T van der Helm, H F J M Koopman

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 7, 2016
    PubMed
    Summary
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    Gait stability improves with practice. Repeated exposure to perturbations significantly reduced reaction times in the Rectus Femoris (RF) muscle, enhancing recovery responses and decreasing fall risk.

    Area of Science:

    • Biomechanics
    • Motor Control
    • Human Movement Science

    Background:

    • Gait stability relies on control mechanisms to counteract perturbations.
    • Larger perturbations typically elicit longer-latency responses for adequate reactions.
    • Training may alter these recovery response mechanisms.

    Purpose of the Study:

    • To investigate if recovery response mechanisms change during a training session involving multiple perturbations.
    • To analyze differences in recovery reactions from the beginning to the end of a perturbation sequence.

    Main Methods:

    • Subjects underwent a training session with repeated perturbations.
    • Surface electromyography (sEMG) measured the latency of the Rectus Femoris (RF) muscle burst.
    • Recovery reactions at the start and end of the training were compared.

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    Main Results:

    • A significant reduction in Rectus Femoris (RF) muscle activation latency was observed during the training session.
    • Subjects demonstrated more appropriate responses to perturbations with repeated trials.
    • This indicates an adaptation in motor control strategies for gait stability.

    Conclusions:

    • Training with multiple perturbations can modify gait recovery response mechanisms.
    • Reduced latencies and improved response appropriateness suggest enhanced gait stability through practice.
    • These findings have implications for rehabilitation and fall prevention strategies.