Isometric Gesture

An isometric gesture is a gesture in which a person activates their muscles without producing visible movement — the body position remains static while muscle tension changes. This contrasts with isotonic gestures, where visible hand or arm movement occurs over time. Isometric gestures are particularly relevant to accessibility because some people with motor impairments can flex or contract muscles but cannot produce large or controlled movements. Recognizing isometric gestures requires sensors like electromyography (EMG) that detect electrical muscle activity, since motion-based sensors such as cameras or accelerometers cannot detect input without visible movement.