recording of electrical activity from the muscular system; in sleep recording, synonymous with resting muscle activity or potential The chin EMG, along with EEG and EOG, is one of the three basic variables used to score sleep stages and waking Surface electrodes are used to record sleep in humans, measuring activity from the submental or masseter muscles These reflect the changes in resting muscle activity During REM sleep the chin/cheek EMG is tonically inhibited
a test that measures the electrical activity of a muscle or a group of muscles An EMG can detect abnormal electrical muscle activity due to diseases and neuromuscular conditions