what is an emg study
Electromyography (EMG). Electromyography (EMG) measures muscle response or electrical activity in response to a nerveâs stimulation of the muscle. The test is used to help detect neuromuscular abnormalities.During the test, one or more small needles (also called electrodes) are inserted through the skin into the muscle.he EMG is usually performed immediately following a nerve conduction study (a test that measures the flow of current through a nerve before it reaches the muscle rather than the response of muscle itself).