SLIDESHOW Muscle Cramps (Charley Horse) and Muscle Spasms See SlideshowĪLS (amyotrophic lateral sclerosis, Lou Gehrig's disease) and MS (multiple sclerosis) are both diseases of the nervous system (neurodegenerative).ĪLS is a disease in which the nerve cells in the body are attacked by the immune Normal body temperature must be maintained for the NCV test, because low body temperatures slow nerve conduction. The NCV test can be used to detect true nerve disorders (such as neuropathy) or conditions whereby muscles are affected by nerve injury (such as carpal tunnel syndrome). A decreased speed of transmission indicates nerve disease. 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 (nerve conduction velocity). The resulting electrical activity is recorded by the other electrodes. One electrode stimulates the nerve with a very mild electrical impulse. This is usually done with surface patch electrodes (they are similar to those used for an electrocardiogram) that are placed on the skin over the nerve at various locations. In this test, the nerve is electrically stimulated while a second electrode detects the electrical impulse 'down-stream' from the first.

What other test is done during an intramuscular EMG?Ī nerve conduction velocity (NCV) test is often done at the same time as an EMG.

Emg does it hurt