NCS measures how fast and how strong the electrical activity is in a nerve. Sometimes, problems with the electrical activity in your nerves can cause pain, tingling, or weakness in your muscles. Nerve signals are electrical impulses that travel quickly throughout your nervous system. If the test picks up a problem, you may be diagnosed with what is called a neuromuscular disorder. Electromyography measures how well your muscles respond to those signals. Your muscles move when nerve signals from the brain tell them to get to work. Your doctor can use the results of these tests to figure out whether you have a muscular problem or a nerve problem. The other is a nerve conduction study (NCS). When your muscles are sore or weak and you don’t know why, there are a couple of tests that can help give you answers.
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