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Stimulated myo electric activity from close lying and remote muscles

, : Stimulated myo electric activity from close lying and remote muscles. Electromyography and Clinical Neurophysiology 18(6): 535-552

New criteria (4) were proposed for differentiation between myoelectric activity generated from close lying and that from remote human muscles (volume conducted activity) by stimulation of peripheral nerves. The presence of spikes and indentations of the potentials recorded by monopolar needle electrodes; changes in the shape of potentials recorded at different depths in a muscle and at a different distance from it; change in the duration of the monopolarly recorded potentials upon changes of the muscle length; difference in the duration of summated potentials and the MU [motor unit] potentials recorded from a muscle were considered. The usefulness and limitation of these criteria were discussed. Using these and other criteria described earlier it was confirmed that the H- and T-potentials of TS [triceps surae muscle] were generated from S [soleus muscle) and from GM [gastrocnemius medialis muscle] and GL [gastrocnemius labialis muscle]. The concomitant potentials of TA [tibialis anterior muscle] in case of H- and T-reflexes of TS were possibly volume conducted.


PMID: 743938

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