Such devices may include an electromyograph (EMG), which monitors muscle tension, an electroencephalograph (EEG), which monitors brain waves, or a heart monitor.    From Wordnik.com.  [Is Biofeedback Effective in Relieving Certain Health Disorders?] Reference

These signals are picked up by a sensor called an electromyograph worn like a watch on the forearm of the person making the movements.    From Wordnik.com.  [Home | Mail Online] Reference

The user controlling the "hand" wears a wristband-like electromyograph sensor, which causes the robotic appendage to react according to muscle contractions.    From Wordnik.com.  [RCR Wireless News] Reference