What does electromyogram mean?
An electromyogram is a recording of the electrical impulses that skeletal muscles generate when they contract. Because every muscle movement is triggered by electrical signals travelling from nerves, placing small electrodes on or within the muscle allows clinicians to capture those signals as a trace — the electromyogram. The term also refers loosely to the diagnostic test itself, though technically that procedure is called electromyography. Electromyograms are central to neurology: they help distinguish disorders of the muscles from disorders of the nerves, detect conditions such as carpal tunnel syndrome, ALS, muscular dystrophy, and peripheral neuropathy, and are widely used in sports science and biomechanics research. In everyday conversation the word rarely appears; doctors and patients alike tend to say simply "EMG." Formal, precise, and unambiguous, the word combines three classical roots — electricity, muscle, and writing — making its meaning transparent once decoded.
nounA recording of the electrical activity of muscles, produced by a technique called electromyography and used to diagnose neuromuscular disorders.
- A tracing or record of the electrical activity produced by skeletal muscles, obtained via electromyography, typically used in diagnosing nerve and muscle disorders.
"The neurologist ordered an electromyogram to determine whether the patient's weakness stemmed from nerve or muscle damage."
"The needle electromyogram revealed signs of denervation in the affected muscles."
"Athletes at the lab had surface electrodes attached so that each contraction could be captured on an electromyogram."
Standard regular plural; the abbreviation EMG is often left unchanged in plural clinical usage ("two EMGs").
"Serial electromyograms tracked the gradual recovery of nerve function over six months."
Every time you move a muscle, it fires tiny electrical signals — an electromyogram literally eavesdrops on your body's wiring.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of electromyogram
The word electromyogram was coined in the early twentieth century from three Greek-derived elements: "electro-" from Greek ēlektron (amber, associated with electricity), "myo-" from Greek mys meaning muscle, and "-gram" from Greek gramma meaning something written or drawn — hence literally "a writing of muscle electricity." It follows the same productive pattern as other physiological recordings such as electroencephalogram and electrocardiogram. Its companion forms electromyography and electromyographic share the same roots.
Related word forms
How electromyogram is actually used
A technical medical term used mainly in clinical neurology and research contexts; in everyday speech, clinicians usually shorten it to EMG. It is formal in register and carries no figurative use. Strictly speaking, the electromyogram is the recorded trace itself, while electromyography is the procedure — though the terms are sometimes used loosely interchangeably.
Easily confused with electromyogram
An electroencephalogram records the brain's electrical activity, whereas an electromyogram records the electrical activity of skeletal muscles.
An electrocardiogram records the heart's electrical activity, while an electromyogram measures electrical signals in voluntary muscles.