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Electromyography (EMG) is a diagnostic test that measures the electrical activity of muscles and the nerves controlling them. It is used to evaluate the health and function of the muscles and nerves and to diagnose various neuromuscular disorders.

During an EMG, a trained healthcare professional, often a neurologist or an electromyographer, places small needle electrodes into specific muscles of the body. These electrodes detect and record the electrical signals produced by the muscles at rest and during contraction. The electrical activity is then displayed on a screen and may be heard as sounds through a speaker.

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