what is an emg test

An electromyography (EMG) test is a diagnostic procedure used to evaluate the health and function of skeletal muscles and the nerves that control them. During the test, small needles, also called electrodes, are inserted through the skin into the muscle to measure the electrical activity in response to a nerves stimulation of the muscle. This electrical activity is then displayed on an oscilloscope and can be heard through an audio-amplifier. The test measures the electrical activity of the muscle during rest, slight contraction, and forceful contraction. It is commonly performed by a neurologist or a physiatrist with special training for this procedure. The EMG test is often used alongside a nerve conduction study to help detect the presence, location, and extent of diseases that damage the nerves and muscles. It can help diagnose various injuries or diseases that affect motor nerves and muscles, and it is used to rule out certain conditions. The test is safe and usually well tolerated without the need for pain medication. EMG testing is extremely safe, but individuals with specific medical devices or conditions should consult with their doctor before having the test.