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Active Electrode Advice Needed

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  • Active Electrode Advice Needed

    I have been collecting EMG from the Soleus muscle while subjects walk on
    a treadmill. On some subjects there is an oscillation in the EMG baseline
    immediately around the time of heel strike, which is large enough to make
    the EMG level useless. The electrodes are firmly attached and sway of the
    wires is minimized as much as I see is possible. I have not used active
    electrodes before, but I assume that one of their purposes is to boost the
    EMG signal well beyond this noise level.
    I use standard passive disc electrodes, Grass Amplifiers, and Cambridge
    Electronic Designs A/D system.

    So here are three questions:
    1) Will the use of active electrodes increase the signal to noise
    (movement artifact) ratio, and so eliminate my problem of the baseline

    2) What active electrodes are commercially available to be added to an
    existing system such as mine (i.e., feed a signal into my Grass amps)?

    3) Any other comments or suggestions people have?

    Thanks for your time. I will post a summary of replies.

    Gordon Chalmers

    ************************************************** ***********
    Gordon Chalmers, Ph.D.
    Dept. of Physical Education, Health and Recreation
    Western Washington University, M/S 9067
    Bellingham WA
    Phone: (360) 650-3113
    FAX: (360) 650-7447

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