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Re: Upper extremity strength and comfort

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  • Re: Upper extremity strength and comfort


    You may want to try the following for `design' limits:

    U.S. Military Standard: MIL-STD 1472D

    Diffrient, TIlley & Bardagy. 1980 "Humanscale" Cambridge,
    Massachusetts: The MIT Press.

    For correction from maximum:

    - Eastman Kodak (1986) recommends that freq. exertions should not exceed
    20% of weaker worker's strength
    - Humanscale (1980) recommends 66% MVC for force application without
    - Putz-Anderson (1988), Grandjean (1988) rec. occasional exertions
    should not exceed 50% MVC

    Feel free to contact me directly if you need full references.

    Kevin Bender
    Ergonomics Consultant
    Ontario Ministry of Labour
    Toronto, Canada
    (416) 235-5322

    Patrick Garrett wrote:
    > to:
    > I have been searching the literature for force production limits of the
    > upper extremity, specifically related to operating controls with the hands
    > and fingers. After searching the Biomch-L archives, I have two requests:
    > 1) Does anyone have any study results, book references, or journal articles
    > which report maximum hand and finger strengths for tasks OTHER than gripping or
    > pinching with the wrist in a neutral (straight) posture? There are probably
    > hundreds of studies on pinch and grip forces, but what about pushing buttons or
    > levers and twisting knobs or finger wheels while the wrist posture varies? I
    > am looking for these limits for various ages, genders, and global populations.
    > 2) Any suggestions or citations for converting maximum efforts to
    > "comfortable" or "preferred" efforts? Not necessarily magnitudes which can
    > be comfortably sustained for long periods of time, but efforts which could be
    > as infrequent as two or three times a day.
    > Any input is much appreciated and could save me from running countless
    > studies to determine comfortable efforts in a multitude of postures!
    > Thanks in advance for your replies, and I will try to post a summary of
    > replies.
    > Regards,
    > Patrick Garrett Phone: 24-83818
    > Corporate Design FCG
    > Human Factors and Ergonomics PDC - Cube: 2E-E47 M.D. 283
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