As you contract your muscle more forcefully, more and more muscle fibers are activated, making more action potentials.Ī healthy muscle will show no electrical activity (no signs of action potential) during rest. The action potential (size and shape of the wave) that this makes on the monitor gives information about how your muscle responds to nerve stimulation. But after that, there should be no signal.Īfter the electrode is put in, you may be asked to contract your muscle, such as by lifting or bending your leg.
When an electrode is put in, a brief period of activity can be seen. Muscle tissue does not normally make electrical signals during rest. The number and location of muscles depends on what the healthcare provider is looking for.ĮMG measures the electrical activity of your muscle during rest, slight contraction, and forceful contraction. Often, several muscles are tested 1 at a time. An audio-amplifier is used so the activity can be heard. The electrical activity picked up by the electrodes is then displayed on a monitor in the form of waves. The test is used to help find nerve and muscle problems.ĭuring the test, your healthcare provider will put small needles (also called electrodes) through your skin into a muscle. Electromyography (EMG) measures muscle response or electrical activity in response to a nerve’s stimulation of your muscle.
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