TENSIOMYOGRAPHY

Tensiomyography (TMG) is used for monitoring radial muscle belly displacement under isometric conditions. The displacement sensor is positioned perpendicularly to the tangential plane on the largest area above the muscle belly. The muscle belly displacement (enlargement) during contraction is observed and monitored.

Muscle contraction is elicited by single-twitch electrical stimuli. Two self-adhesive electrodes are placed around the TMG sensor. The anode is placed distally and the cathode proximally, 20-50 mm from the measuring point. Bipolar electrical stimulation consisted of a single DC pulse of 1 ms in duration.

TMG PARAMETERS

·         Delay time (td) as a time between the electrical impulse and 10% of the contraction

·         Contraction time (tc) as a time between 10% and 90% of the contraction

·         Sustain time (ts) as a time between 50% of the contraction and 50% of the relaxation

·         Relaxation time (tr) as a time between 90% and 50% of the relaxation

·         Displacement (Dm) as the maximal amplitude of the muscle contraction