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

J. D. Given*, B. D. Schmit, W. Z. Rymer, J. P.A. Dewald

*Corresponding author for this work

Research output: Contribution to journalConference article

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.

Original languageEnglish (US)
Pages (from-to)605-606
Number of pages2
JournalAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume2
StatePublished - Dec 1 1996
EventProceedings of the 1996 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Part 2 (of 5) - Amsterdam, Neth
Duration: Oct 31 1996Nov 3 1996

ASJC Scopus subject areas

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

Fingerprint Dive into the research topics of 'Electrical stimulation induced spasticity reductions in stroke as evidenced by changes in elbow torque responses'. Together they form a unique fingerprint.

  • Cite this