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View Full Version : Technical problems and solutions for measuring intramuscular EMG



Adrian Bisig
02-09-1999, 07:13 PM
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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