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  • Measuring back strength w/out cheating

    Hi there,

    We're doing a research project measuring back strength in patients before
    and after spinal fusion surgery. We have a back attachment that attaches to
    our Biodex and allows us to measure back strength in the lumbar region doing
    a flexion/extension isokinetic test while the subject is semi-standing. The
    other test we are doing is an isometric lateral bending test measuring
    oblique strength. We would like to make sure that our patients are not
    cheating and using other muscles, such as the rectus femoris, hamstrings,
    gastrocs and gluteus medius, to assist them in doing these exercises. We
    have thought about monitoring EMG for these muscles while they are
    performing the exercises, but we need instantaneous feedback while the
    patient is still in the lab. If we collect the EMG data, we have to go
    through the process of reducing it and then make a decision on whether the
    subject was using their other muscles too much. So we are looking for
    something that will tell us right away whether or not the subjects are
    cheating when they are performing the test. Any ideas on this matter or any
    literature that anyone could point me to would be appreciated.

    Thank you for your help.

    Sincerely,

    Scott Colby
    Movement Science Lab
    Texas Scottish Rite Hospital
    (214) 559-7580
    scolby@tsrh.org

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