A recording or graphical display of the electrical activity produced by muscles during contraction and rest.
From electro- + myogram (Greek 'mys' meaning 'muscle' + 'gramma' meaning 'writing'). Developed in early 20th century as scientists could measure electrical signals from living tissue.
An electromyogram shows that your muscles aren't just mechanical—they're controlled by precise electrical signals your brain sends through nerves, and doctors use EMGs to diagnose nerve and muscle disorders.
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