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Electrogoiniometers and squats

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  • Electrogoiniometers and squats

    We are currently beginning a study to detemine the inertial loads
    that arise during squat lifts with various weights and varying cadences.
    We are interested in determining knee and hip angles throughout the
    movement and plan to use electro-goiniometers (EG) to collect motion data.
    We have found that when attaching the EG directly to the skin, knee output
    angles do not necessarily correspond with joint angle because of EG
    movement due to the quadriceps moving under the skin. We are expeimenting
    with the subjects performing the exercise with a knee brace on which the
    EGs are attached. We are concerned, however, that the brace may cause a
    change in technique. My questions are:
    1) Is there any evidence that squat technique is affected when using a
    knee brace?
    2) Does anyone have suggestions about EG placement to accurately measure
    knee angle while the knee flexes from 0 degrees to about 110 degrees?

    John DeWitt, M.S.
    Biomechanist - Exercise Physiology Laboratory
    Space Physiology & Countermeasures
    Johnson Space Center
    Houston, TX 77058
    281-483-8939 / 281-483-4181 (fax)

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