DocumentCode :
1427026
Title :
The use of selective electrical stimulation of the quadriceps to improve standing function in paraplegia
Author :
Uhlir, James P. ; Triolo, Ronald J. ; Kobetic, Rudi
Author_Institution :
Rehab. Eng. Center, MetroHealth Center, Cleveland OH, USA
Volume :
8
Issue :
4
fYear :
2000
fDate :
12/1/2000 12:00:00 AM
Firstpage :
514
Lastpage :
522
Abstract :
Persons with spinal cord injury (SCI) can benefit significantly from functional neuromuscular stimulation (FNS) systems for standing if manual tasks can be performed while upright. Using FNS to sufficiently activate the knee extensors to rise from a sitting position often results in inadvertent activation of the rectus femoris and/or sartorius, which flex the hip. In this study, intramuscular electrodes implanted in the vastus lateralis and medialis of four subjects with SCI were used to activate these muscles individually and simultaneously to measure knee extension moment. Support forces applied to the arms and feet were measured while upright to quantify the effects of recruiting rectus femoris and/or sartorius. In three of the four subjects, vastus lateralis, by itself, generated adequate knee extension moment for rising from a chair and to maintain static standing. Simultaneous activation of the vastus lateralis and medialis using a bifurcated electrode generated adequate knee extension moment in one subject, and was within 10% of the required moment in another. While upright, activation of the rectus femoris resulted in arm support force increases of 4-11% body weight, while deactivation resulted in arm support force decreases of 6-9% body weight. The results indicate that selective activation of the vastus lateralis, individually or in combination with vastus medialis, can improve current FNS standing systems by reducing the arm support forces required to remain upright
Keywords :
bioelectric phenomena; biomechanics; biomedical electrodes; neuromuscular stimulation; arm support forces reduction; arms; body weight; feet; hip flexing; intramuscular electrodes; knee extension moment measurement; paraplegia; quadriceps; rectus femoris; rising from chair; sartorius; selective activation; selective electrical stimulation; standing function improvement; static standing maintenance; vastus lateralis; vastus medialis; Arm; Electrical stimulation; Electrodes; Force measurement; Hip; Knee; Muscles; Neuromuscular stimulation; Recruitment; Spinal cord injury;
fLanguage :
English
Journal_Title :
Rehabilitation Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
1063-6528
Type :
jour
DOI :
10.1109/86.895955
Filename :
895955
Link To Document :
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