Electromyogram (EMG) and Nerve Conduction StudiesTest Overview
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 by
electrical signals (impulses), and these impulses make the muscles react in
specific ways. Nerve and muscle disorders cause the muscles to react in
abnormal ways. Measuring the electrical activity in muscles and
nerves can help find diseases that damage muscle tissue (such as
muscular dystrophy) or nerves (such as
amyotrophic lateral sclerosis or
peripheral neuropathies). EMG and nerve conduction
studies are often done together to give more complete information.
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