If you require an anal sphincter EMG, you’ll have to fast for a certain number of hours before the procedure and take enemas to clean out your digestive system. During the procedure, a small electrode is inserted a few inches into your rectum. You’ll be asked to alternately relax, squeeze and push (as if you were having a bowel movement). The electrical activity in the muscles will be recorded on a computer, and your doctor will determine if the muscles are behaving as they should. The test takes only about five minutes and you feel minimal discomfort, if any.