Surface Electromyography is a method of measuring muscular strength, tension and relaxation.
Tiny electrodes (passive sensors) are applied over the muscles which are to be measured.
These sensors are able to detect the extremely small amounts of electrical energy that are given off by muscles. The amount of this energy is so small, it can only be measured in Microvolts. For reference: one Microvolt equals a millionth of a Volt.
All muscles give off electrical energy. The more relaxed the muscle is, the less energy is released. The more the tension in the muscle, or the more functional effort (contraction) the muscle makes, the greater the amount electrical energy is given off.
Although typical normative values have been identified for both relaxation and function of the muscles of mastication, the greatest value of surface EMG lies in its ability to compare before and after relaxation and functional tests.
Thanks to this incredible technology, we no longer have to guess or rely on patient opinion as to whether the muscles are more relaxed and/or stronger after therapy. We can now measure with precision and know and record exactly!
