Document Detail

Effects of thoraco-lumbar electric sensory stimulation on knee extensor spasticity of persons who survived cerebrovascular accident (CVA).
MedLine Citation:
PMID:  10847574     Owner:  NLM     Status:  MEDLINE    
Spasticity is mostly due to an excess of impulses to alpha motor neurons partly resulting from a change of interneuron activity. Low threshold afferent has been reported to change the activity in interneuron. The purpose of this study is to investigate the effects of surface spinal paravertebral stimulation on knee extensor spasticity. Ten survivors of stroke, with knee extensor spasticity, received electric stimulation for five 45-minute periods through surface electrodes applied to the skin in the twelfth thoracic and first lumbar areas. The electric stimulations had an amplitude modulated alternating current (AC), with a carrier frequency of 2500 Hz, modulated to "beats" frequency of 20 Hz. Stimulation amplitude was raised to elicit sensory stimulation. The pre- and post-treatment evaluation included the modified Ashworth scale, active torque during controlled knee movements at various velocities, and electromyographic (EMG) activity during the torque measurements. Our results indicate that nine of ten subjects demonstrated a decrease in the modified Ashworth scale post-treatment. The EMG activity of the spastic quadriceps during active knee flexion was decreased post-treatment as compared with the value before treatment. The active torque value of knee flexion or extension at 30 degrees, 60 degrees, or 90 degrees/sec of angular velocity did not change significantly post-treatment. A trend of increasing spastic quadriceps EMG activity with respect to the angular velocity during an active knee flexion was established, with Ashworth scale considered. The level of EMG activity is higher when the Ashworth scale is higher. According to our results, the surface paravertebral sensory stimulation was effective in reducing quadriceps muscle spasticity of the subjects. Both the modified Ashworth scale and the EMG activity of spastic quadriceps during eccentric contraction are suggested as sensitive tools for measuring spasticity of persons who survived cerebrovascular accident (CVA).
R Y Wang; R C Chan; M W Tsai
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of rehabilitation research and development     Volume:  37     ISSN:  0748-7711     ISO Abbreviation:  J Rehabil Res Dev     Publication Date:    2000 Jan-Feb
Date Detail:
Created Date:  2000-09-26     Completed Date:  2000-09-26     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8410047     Medline TA:  J Rehabil Res Dev     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  73-9     Citation Subset:  IM    
Faculty of Physical Therapy, National Yang-Ming University, Taipei, Taiwan, Republic of China.
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MeSH Terms
Aged, 80 and over
Electric Stimulation Therapy
Follow-Up Studies
Hemiplegia / etiology,  rehabilitation
Knee Joint
Middle Aged
Multivariate Analysis
Muscle Spasticity / etiology,  rehabilitation*
Range of Motion, Articular
Sampling Studies
Stroke / complications,  rehabilitation*
Transcutaneous Electric Nerve Stimulation / methods*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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