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Biodex III Inquiry

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  • Biodex III Inquiry

    Dear colleagues,

    We are currently working on a fatigue protocol on the Biodex System
    III isokinetic dynamometer. The protocol consists of
    concentric/eccentric (CON/ECC) contractions at 120º/sec with a range
    of motion of 45º. Due to the narrow range of motion and the moderately
    high speed, the Biodex barely gets up to full speed during the
    eccentric contractions. This was confirmed upon inspection of the
    speed data in which we noted that during the CON phase the speed ramps
    up to 120º/sec almost immediately, but during the ECC phase the speed
    ramps up slower; often taking ~30-40º of the range to get up to speed.
    Occasionally it doesn't even reach 120º/sec if the subject is not
    'pushing hard enough', which is bound to occur in a fatigue protocol
    by definition. We've tried adjusting the ECC torque limit and changing
    the "cushion" (from soft to hard), but we are still experiencing the
    same problems.

    In short, it appears as though ECC contractions are forced by the
    software into a very soft "cushion". Since we are primarily concerned
    with the ECC phase, this is a significant issue for us.

    If anybody has had similar issues with the Biodex and have found a
    resolution, any suggestions would be highly appreciated.

    Thank you in advance.
    Federico Pozzi