NDLI: Electrical stimulation induced spasticity reductions in stroke as evidenced by changes in elbow torque responses

Content Provider	IEEE Xplore Digital Library
Author	Given, J.D. Schmit, B.D. Rymer, W.Z. Dewald, J.P.A.
Copyright Year	1996
Description	Author affiliation: Sensory Motor Performance Program, Northwestern Univ., Chicago, IL, USA (Given, J.D.)
Abstract	We studied the effects of electrical stimulation of the skin on upper extremity spasticity in 9 hemiparetic stroke subjects. The effects were quantified by comparing reflex torque responses during ramp and hold angular perturbations of the elbow. Electrical stimulation was applied to skin over the biceps muscle of all nine subjects for a period of ten minutes at a 20 Hz frequency, pulse duration 0.1 ms, with an intensity level between sensory and motor thresholds. In a subset of subjects (n=2), the protocol was repeated using frequencies of 1 and 100 Hz. In seven subjects, peak torque responses were reduced for at least 30 minutes. Significant increases in mean threshold onset angle of the reflex torque without changes in reflex stiffness were measured. These long-term changes may reflect synaptic plasticity of spinal circuitry outside the stretch reflex loop. Comparable reductions in spasticity were observed when repeating the same protocol with different stimulation frequencies.
Starting Page	605
Ending Page	606
File Size	257277
Page Count	2
File Format	PDF
ISBN	0780338111
DOI	10.1109/IEMBS.1996.651886
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-10-31
Publisher Place	Netherlands
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrical stimulation Elbow Frequency Protocols Muscles Torque measurement Skin Electromyography Biomedical measurements Position measurement
Content Type	Text
Resource Type	Article

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