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EMG patterns and forces developed during step-down

W Freedman, G Wannstedt, R Herman

    American Journal of Physical Medicine
    |December 1, 1976
    PubMed
    Summary
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    Sensory information and an undisturbed nervous system enable the triceps surae muscle to contract before foot impact during step-down. Without this, impact forces increase, potentially causing skeletal injury.

    Area of Science:

    • Biomechanics
    • Neuroscience
    • Human Movement Analysis

    Background:

    • Sensing step height and maintaining sensory integrity are crucial for protective muscle responses.
    • Impaired sensory feedback can lead to increased impact forces during locomotion.

    Purpose of the Study:

    • To investigate the electromyographic activity and impact forces during step-down under varied sensory conditions.
    • To determine the role of sensory information and nervous system integrity in pre-impact muscle activation.

    Main Methods:

    • Electromyographic (EMG) activity of the triceps surae muscle was recorded during step-down from various heights.
    • Vertical impact forces and knee angles were measured.
    • Sensory input was manipulated using blindfolds and Achilles' tendon vibration.

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    Main Results:

    • Triceps surae contraction prior to impact occurred when step height was known and sensory input was unimpaired.
    • In the presence of vibration or unknown step height, pre-impact contraction was absent.
    • Absence of pre-impact contraction resulted in larger impact force transients absorbed by the skeletal structure.

    Conclusions:

    • Proprioceptive and visual cues are essential for anticipatory muscle responses during step-down.
    • Disruptions in sensory systems (e.g., impaired vision, nerve damage) can lead to potentially injurious impact forces.
    • These findings highlight the risk of skeletal injury in individuals with compromised sensory feedback during activities like stepping down.