An instrument or device that records and displays the electrical activity of muscles; the machine that creates an electromyogram.
From electro- + myograph (Greek 'mys' meaning 'muscle' + 'graphia' meaning 'recording'). Invented in early 20th century to study muscle physiology.
An electromyograph can tell if your muscles are working properly by listening to their electrical 'chatter'—neurologists use it to diagnose everything from ALS to pinched nerves.
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