Nerve conduction studies also may be used during treatment to test the progress being made. By stimulating the nerve at various places, the doctor can determine the specific site of the injury. If the nerve is damaged, however, the signal will be slower and weaker. In healthy nerves, electrical signals can travel up to 120 miles per hour. As the current travels down the nerve pathway, the electrodes placed along the way capture the signal and time how fast the signal is traveling. Then the doctor stimulates the nerve with an electric current. NCS are often done along with the EMG to determine if a nerve is functioning normally.The doctor conducting the test will tape wires (electrodes) to the skin in various places along the nerve pathway. EMG results can help the doctor diagnose muscle disorders, nerve disorders, and disorders affecting the connection between nerves and muscles. These symptoms may include tingling, numbness, or unexplained weakness in the limbs. A doctor will usually order an EMG when someone is showing symptoms of a muscle or nerve disorder. Call your primary care physician if post-procedural discomfort lasts more than 24 hours. An EMG translates these signals into graphs or numbers, helping doctors to make a diagnosis. This usually lasts less than 24 hours, but may last for several days. They transmit electrical signals that cause muscles to contract and relax. These nerve cells are known as motor neurons. Electromyography (EMG) is a diagnostic procedure that evaluates the health condition of muscles and the nerve cells that control them.
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