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Transient vibrations caused by heel strike.

J E Smeathers

    Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
    |January 1, 1989
    PubMed
    Summary
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    Heel strike vibrations travel vertically through the body. Shock absorption primarily occurs in the legs and spine, with average velocities measured using accelerometers.

    Area of Science:

    • Biomechanics
    • Human Physiology

    Background:

    • Transient vibrations are generated during activities like walking and running.
    • Understanding vibration transmission is crucial for injury prevention and performance optimization.

    Purpose of the Study:

    • To monitor and analyze transient vibrations transmitted through the human body during heel strike.
    • To quantify vibration velocity and identify key shock absorption regions.

    Main Methods:

    • Utilized accelerometers attached to the skin to record transient vibrations.
    • Applied a transmissibility function to correct for skin movement artifacts.
    • Measured vibration velocities between the foot and head, and within different body segments.

    Main Results:

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  • The average velocity of heel-strike transients from foot to head is 220 m/s.
  • Vibration velocity is highest in the legs (610 m/s) and lowest in the spine (90 m/s).
  • Significant shock absorption is observed in the legs and, to a lesser extent, the spine.

    • Conclusions:

    • The legs and spine play a critical role in attenuating impact forces from heel strikes.
    • The described method provides a reliable way to measure in-vivo vibration transmission.
    • Findings contribute to understanding the biomechanics of locomotion and impact response.