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Technical problems and solutions for measuring intramuscular EMG

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  • Technical problems and solutions for measuring intramuscular EMG

    Dear Listmembers,
    Recently I asked for solutions of problems in measuring intramuscular
    EMG using fine-wire electrodes.

    There were a few replies which I want to post on Biomch-L. Thank you
    very much for your answers:

    To avoid or solve problems during measuring intramuscular EMG using fine
    wire electrodes you can / should ...

    -take a impedance meter and check each electrode within the needle
    before insertion

    -secure if the leads are not to short (which would produce a flat line)

    -secure if the ends of the wires are staggered enough, so that the
    stripped ends do not make any contact

    -stripping the insulation off the ends of the wires for 1 mm

    -interface the proximal ends of the wire into coils of springs directly
    taped to the skin near insertion side

    -be very carefully not to pull the wires after successful application
    (because of the possible lost of staggering into the muscle)

    -try to pull one wire carefully if you do not measure any signal

    -twist the two wires after it has been threaded into the needle
    (twisting reduces noise)

    -add a extra coat of teflon insulation to ensure adequate insulation
    (especially at the sharp end of the needle insulation can be faulty and
    make contact)

    -use ultrasound to confirm correct placement of the wires

    -find helpful information in:
    Burgar C.G., Valero-Cuevas F.J. and Hentz V.R. (1997). Fine-wire
    electromyographic recording during force generation. Application to the
    index finger kinesiologic studies. Am J Phys Rehabil 76(6):494-501

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