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The speed of the response is called the conduction velocity. The same nerves on the other side of the body may be studied for comparison. When the test is done, the electrodes are removed. Nerve conduction studies are done before an EMG if both tests are being done.Nerve conduction tests may take from 15 minutes to 1 hour or more, depending on how many nerves and muscles are studied.ormal: The EMG recording shows no electrical activity when the muscle is at rest. There is a smooth, wavy line on the recording with each muscle contraction. The nerve conduction studies show that the nerves send electrical impulses to the muscles or along the sensory nerves at normal speeds, or conduction velocities.
The resulting electrical activity is recorded by the other electrodes. The distance between electrodes and the time it takes for electrical impulses to travel between electrodes are used to calculate the speed of impulse transmission (the nerve conduction velocity, or NCV). decreased speed of nerve conduction indicates nerve disease. The NCV test is often done at the same time as an electromyogram (EMG) in order to exclude or detect both nerve and muscle conditions. The interpretation of an abnormal NCV test depends on why the test was done in the first place.