Scheduled System Maintenance:
On Wednesday, July 29th, IEEE Xplore will undergo scheduled maintenance from 7:00-9:00 AM ET (11:00-13:00 UTC). During this time there may be intermittent impact on performance. We apologize for any inconvenience.
By Topic

Hand opening by electrical stimulation in patients with spastic hemiplegia

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)

Spasticity is a motor control disorder common after stroke, which can cause the fingers to involuntarily flex and form a fist. Even in the presence of strong spasticity, functional electrical stimulation can provide hand opening in hemiplegics with spastic finger flexor muscles through stimulation of the extensor digitorum communis muscle and the ulnar nerve. Stimulation of these sites did not reduce the activity in spastic finger flexor muscles, as hypothesized initially, and as might occur through a reciprocal inhibitory mechanism. In fact, flexor activity generally increased during extensor stimulation. In spite of increased flexor activity, the extension force was sufficient to fully extend the fingers. Similarly, stimulation of the finger extensors in able-bodied subjects did not reduce the EMG in the finger flexors, and could even increase it. The influence of voluntary effort on finger extension achieved by stimulation was also studied, since a neuroprosthesis for stroke patients might combine voluntary effort with stimulation. Finger extension was generally diminished when the subject attempted to assist the stimulated extension voluntarily or when stimulation followed voluntary flexion as might occur when trying to open the hand following a voluntary grasp. The largest extension was achieved when the subject remained relaxed. Since voluntary effort influences the degree of hand opening achieved by stimulation, some method of adjusting stimulation levels during task performance would be desirable in a clinically deployed neuroprosthesis

Published in:

Rehabilitation Engineering, IEEE Transactions on  (Volume:3 ,  Issue: 2 )