Technical Briefs

A New Standard in Objective Measurement of Spasticity

[+] Author and Article Information
Mindy F. Levin, Aditi A. Mullick, Marcos Rodrigues

School of Physical and Occupational Therapy,
McGill University;
Center for Interdisciplinary Research in Rehabilitation,
Montreal, Quebec.

Anatol G. Feldman

Department of Physiology,
University of Montreal
, Montreal, Quebec. Canada;
Center for Interdisciplinary Research in Rehabilitation,
Montreal, Quebec.

Manuscript received March 15, 2013; final manuscript received April 26, 2013; published online July 3, 2013. Assoc. Editor: Arthur G. Erdman.

J. Med. Devices 7(3), 030909 (Jul 03, 2013) (2 pages) Paper No: MED-13-1047; doi: 10.1115/1.4024488 History: Received March 15, 2013; Revised April 26, 2013

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Grahic Jump Location
Fig. 1

Schematic diagram of the TRS threshold measurement system as applied to measure spasticity in the elbow flexor muscles (biceps brachii)

Grahic Jump Location
Fig. 2

Data for one stretch trial in a patient with spasticity in the biceps muscle is shown. EMG signals are filtered and rectified (blue) and the angle (red trace) and velocity of stretch (green trace) at the onset of the EMG activity (thin vertical blue line) is identified. Values of threshold angle and velocity at each speed of stretch are computed and used to determine the tonic stretch reflex (TSR) threshold, a measure of spasticity.




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