An electromyogram (EMG) measures the electrical activity of muscles at rest and during contraction. Nerve Conduction Studies measure how well and how fast the nerves can send electrical signals. Nerves control the muscles in the body with electrical signals called impulses. These impulses make the muscles react in specific ways. Nerve and muscle problems cause the muscles to react in abnormal ways.
If you have leg or arm pain or numbness, you may have these tests to find out how much your nerves are being affected. Electrodiagnostic tests can help direct treatment. For instance, if nerve damage or abnormalities are identified with an EMG, a patient may benefit from injections or oral nerve medications.