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Low frequency self-generated vibration during ambulation in normal men

A Cappozzo

    Journal of Biomechanics
    |January 1, 1982
    PubMed
    Summary
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    Human subjects exhibit adapted responses to whole-body vibration during walking. Increased walking speed amplifies vertical acceleration, nearing resonant frequencies of body organs.

    Area of Science:

    • Biomechanics
    • Human Physiology
    • Vibration Analysis

    Background:

    • Understanding human body's response to vibration is crucial for ergonomics and safety.
    • Previous research indicates specific frequencies can induce resonance in body tissues and organs.

    Purpose of the Study:

    • To assess upper body low-frequency vibration during level walking in normal males.
    • To analyze the relationship between walking speed and vibration characteristics.
    • To compare measured vibration data with known biodynamic properties and subjective responses.

    Main Methods:

    • Five healthy males walked at speeds from 0.99 to 2.35 m/s.
    • Stereophotogrammetry was used for 3D measurement of trunk and head displacement.
    • Linear accelerations were derived via double differentiation and analyzed in time and frequency domains.

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    Main Results:

    • Vertical acceleration increased significantly with higher walking speeds, approaching resonant frequencies of internal organs.
    • Coordinated trunk-pelvis movement minimized anteroposterior head acceleration.
    • This movement also shifted the head acceleration spectrum towards lower frequencies.

    Conclusions:

    • The human body demonstrates adaptive mechanisms to mitigate vibration effects during locomotion.
    • Walking speed critically influences vibration exposure, potentially reaching hazardous resonant frequencies.
    • Proprioceptive control, like trunk-pelvis coordination, plays a key role in reducing head vibration.