These are tests of the nerves in the hand, arms, legs, and occasionally elsewhere in the body. The studies pass small electrical currents through the skin and make recordings of the natural electrical signals further down the nerve or over a muscle. This is usually done with pads attached to the skin. Needles are not usually used. The electrical pulses produce a strange tingling sensation which can be uncomfortable, but should not be painful. Your muscles may have brief twitches when stimulated. There are no after effects. Once the test is over, you will be able to go home or back to work/school.
Please inform the doctor if you have a pacemaker or defibrillator.