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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.
Electromyography (EMG) is an electrical recording of muscle activity that aids in the diagnosis of neuromuscular disease. Muscles are stimulated by signals from nerve cells called motor neurons. This stimulation causes electrical activity in the muscle, which in turn causes contraction. This electrical activity is detected by a needle electrode inserted into the muscle and connected to a recording device. Together, the electrode and recorder are called an electromyography machine.