During EMG, the needle is an electrode that is inserted inside the muscle for the same purpose. How do EMG and NCS equipment detect changes?Įlectrodes may be placed over the skin to detect electrical changes during NCS. Sick muscles or nerves may have changes in those electrical activities that are detected with these techniques. Nerves send electrical signals to muscles telling them to contract when needed, and muscles produce electrical activity when they move. Nerve and muscle cells produce tiny electrical currents. They can help detect the cause of problems, such as muscle weakness, numbness, spasms, paralysis or pain, and determine if the problem involves the nerves and/or muscles, or how nerves connect to the muscles. These tests are important diagnostic tools, because they can provide vital information about the health of your muscles and nerves. Why should I learn about electromyography (EMG) and nerve conduction studies (NCS)? Electromyography (EMG) and nerve conduction studies (NCS) involve stimulating nerves with a small electrical current (NCS) and inserting a thin needle into the muscle (EMG) to measure electrical activity and uncover any neuromuscular abnormalities.
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