As the muscle is contracted more forcefully, more and more muscle fibers are activated, producing action potentials.Ī related procedure that may be performed is nerve conduction velocity (NCV). The action potential (size and shape of the wave) that this creates on the oscilloscope provides information about the ability of the muscle to respond when the nerves are stimulated. When an electrode is inserted, a brief period of activity can be seen on the oscilloscope, but after that, no signal should be present.Īfter all of the electrodes have been inserted, you may be asked to contract the muscle, for example, by lifting or bending your leg. Muscle tissue does not normally produce electrical signals during rest. An audio-amplifier is used so the activity can be heard.ĮMG measures the electrical activity of muscle during rest, slight contraction, and forceful contraction. The electrical activity picked up by the electrodes is then displayed on an oscilloscope (a monitor that displays electrical activity in the form of waves). The test is used to help detect neuromuscular abnormalities.ĭuring the test, one or more small needles (also called electrodes) are inserted through the skin into the muscle. (Myogram) Procedure overview What is EMG?Įlectromyography (EMG) measures muscle response or electrical activity in response to a nerve’s stimulation of the muscle.
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