what is a emg nerve conduction test
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.n EMG is done to: 1  Find diseases that damage muscle tissue, nerves, or the junctions between nerve and muscle. 2  Find the cause of weakness, paralysis, or muscle twitching.