Non-linear apparent mass of the supine human body exposed to vertical whole-body vibration

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    Abstract

    The vertical (i.e. x-axis) apparent mass and the cross-axis (foot-to-head, z-axis) apparent mass of the supine human body have been measured during random (0.25 to 20 Hz) vertical whole-body vibration at five magnitudes (0.125, 0.25, 0.5, 0.75 and 1.0 ms-2 r.m.s.). Twelve male subjects adopted a relaxed supine posture assumed to involve less trunk muscle activity than sitting or standing postures. A dominant primary resonance in the median normalised apparent mass resonance frequency decreased from 10.35 Hz to 7.32 Hz as the vibration magnitude increased from 0.125 to 1.0 ms-2 r.m.s. The non-linear response of the body was apparent in both the vertical (x-axis) and the horizontal (z-axis) directions.
    Original languageEnglish
    Publication statusPublished - 2006
    EventThe 41st United Kingdom Group Meeting on Human Responses to Vibration - QinetiQ, Farnborough, Hampshire, England
    Duration: 20 Sep 200622 Sep 2006

    Conference

    ConferenceThe 41st United Kingdom Group Meeting on Human Responses to Vibration
    CityQinetiQ, Farnborough, Hampshire, England
    Period20/09/0622/09/06

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