Electromyography (EMG) is a test that checks the health of the muscles and the nerves that control the muscles.
EMG; Myogram; Electromyogram
How the Test is Performed
The health care provider inserts a very thin needle electrode through the skin into the muscle. The electrode on the needle picks up the electrical activity given off by your muscles. This activity appears on a nearby monitor, and may be heard through a speaker.
After placement of the electrodes, you may be asked to contract the muscle. For example, by bending your arm. The electrical activity seen on the monitor provides information about your muscle's ability to respond when the nerves to your muscles are stimulated.
A nerve conduction velocity test is almost always performed during the same visit as an EMG.