An EMG records and analyzes the electrical activity in your muscles. It is used to learn more about the functioning of nerves in the arms and legs. When a normal muscle is at rest, it is electrically silent.
During an EMG, small, thin needles are placed in the muscle to record the electrical activity. The doctor will ask you to relax the muscle and to tense it slightly. The doctor will listen and watch a computer screen that broadcasts the electrical signals. You will also be able to hear the signal sounds as you move the muscle. There are no long-term side effects. Usually, you can get the results immediately after the test.