The needle EMG study involves the insertion of needle electrode into the skin. The electrode is moved around slightly after its insertion. The needle electrodes are designed for minimal pain and discomfort.
The EMG electrodes record the electrical signal generated by the muscle. If there is muscles disease or nerve damage, the EMG electrode will show the abnormality.
There is some discomfort at the time the needle electrodes are inserted. They feel like shots. After study done, the muscle may feel a little sore for up to a few days.
During the nerve conduction study, mild electrical impulses are sent along the course of a nerve in the arm or leg. The electrical impulse will make the muscles in your arm and leg contract.
Two electrodes are placed along the course of the nerve. When the nerve is stimulated, it must transmit the signal along its course. The electrodes record the signal as it passes by. A normal nerve will transmit the signal faster and stronger than a damaged nerve.