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Monopolar vs. Bipolar EMG Readings. Electromyograhic or EMG signal is the muscle electrical activity. It is the superposition of the evoked action potentials of all the active motor units in a muscle. It can be recorded either in Monopolar or Bipolar configuration.
An EMG is the summation of action potentials from the muscle fibers under the electrodes placed on the skin. The more muscles that fire, the greater the amount of action potentials recorded and the greater the EMG reading. EMG recording: The EMG is recorded by using a electrode placed on the muscle. The electrical activity measured by each muscle electrode and the ground electrode are sent to an amplifier. The amplifier eliminates random voltages caused by electrical noise by subtracting the signal from the ground electrode from the muscle electrode, producing the raw EMG.