Electromyography (EMG) is an electrodiagnostic medicine technique for evaluating and recording the electrical activity produced by skeletal muscles. EMG is performed using an instrument called an electromyograph to produce a record called an electromyogram
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3. Equipment
• electrodes
– Surface electrodes
– Needle electrodes
• a high-gain amplifier (10-5000Hz)
– connected to an oscilloscope
• oscilloscopic traces may be photographed or stored on magnetic tape
– EMG signals may be fed to an audio unit for an on the spot feel of the
signals
• an arrangement for recording the output
– EMG is best done in a specially constructed shielded room to
prevent interference
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6. Factors that effect MUP
• Technical factors
– Type of needle electrode
– Characteristics of recording surface
– Electrical characteristics of cable
– Preamplifier & amplifier
– Method of recording
• Physiological factors
– Age of the patient
– Muscle examined
– Temperature
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