Nerve conduction studies measure the conductivity of the nerves. An EMG is designed to record the electrical activity produced by the muscles, during rest and contraction. Diseases affecting the muscles and nerves can result in abnormal electrical activity.Įlectromyography (EMG) and Nerve conduction studies are diagnostic tests used to detect nerve and muscle disorders and to evaluate the functioning of your nerves and muscles. Nerves use electrical impulses to coordinate muscle movement in our bodies.