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  • Myographs designed for detecting, amplifying and recording the electrical potential of skeletal muscle during muscular activity. These recorders typically consist of signal amplifiers, filters (to suppress interference), memory (e.g., electronic, optical/magnetic disc), a loudspeaker, and a display. They also include detachable surface electrodes placed near the muscle (or, for more accurate measurements, needle- or fine-wire electrodes are placed within the muscle). The results may be displayed as a graphic of the measured voltages vs. time (an electromyogram); as the signals occur at audible frequencies they can be amplified and reproduced using a loudspeaker which facilitates the identification of specific disorders. Electromyographs are mainly used to assess the functional ability of the peripheral nerves, helping in the diagnosis of neurological and neuromuscular disorders.
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