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vertical center line (from side view) of human torso

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  • vertical center line (from side view) of human torso

    I am testing the whole body safety harness using human subjects. One of
    the test conditions requires that subjects be suspended by a cable from
    above that is connected to a D-ring at the back. According to ANSI
    (Z359.1-1992), "In suspension, after the fall is arrested, the angle at rest
    which the vertical center line of the test torso (from the side view of the
    torso, my interpretation) makes with the vertical shall on exceed 30

    I am concerned about the definition of the vertical center line of the
    test torso. I talked to a person who helped develop the ANSI standard. I was
    told that because the definition was based on test dummies instead of human
    torsos, it is not clear how the center line of human torso should be
    defined. But as long as the center line of the human torso is defined as
    parallel to the spinal column, the definition should be acceptable.

    So, my question is how I should define the center line. Can I landmark
    the center point of the chest cage (right side view) and the right greater
    trochanter, connect the two points and take this line as the center line? Or
    is there any better way to define the center line?

    Jinhua Guan

    Associate Service Fellow

    National Institute for Occupational Safety and Health

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