- 1. The recording of electrical activity generated in muscle for diagnostic purposes; both surface and needle recording electrodes can be used, although characteristically the latter is employed, so that the procedure is also called needle electrode examination. 2. Umbrella term for the entire electrodiagnostic study performed in the EMG laboratory, including not only the needle electrode examination, but also the nerve conduction studies. [electro- + G. mys, muscle, + grapho, to write]- evoked e. SYN: electrodiagnosis.
* * *n.continuous recording of the electrical activity of a muscle by means of electrodes inserted into the muscle fibres. The tracing is displayed on an oscilloscope. The technique is used for diagnosing various nerve and muscle disorders and assessing progress in recovery from some forms of paralysis.
* * *elec·tro·my·og·ra·phy (EMG) (e-lek″tro-mi-ogґrə-fe) [electro- + myography] an electrodiagnostic technique for recording the extracellular activity (action potentials and evoked potentials) of skeletal muscles at rest, during voluntary contractions, and during electrical stimulation; performed using any of a variety of surface electrodes, needle electrodes, and devices for amplifying, transmitting, and recording the signals. electromyographic adj
Medical dictionary. 2011.