<qa>  What is the electrical activity of the muscle cells recorded and analyzed by a computer?- Electrophysiologic studies electromyography and nerve conduction testing are done once at the beginning of the study and again one year later. For electromyography, a small needle is inserted into a few muscles and the patient is asked to relax or to contract the muscles. The electrical activity of the muscle cells is recorded and analyzed by a computer. For nerve conduction testing, nerves are stimulated through small wire electrodes attached to the skin and the response is recorded and analyzed. 