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Voluntary Activation of the Knee Extensors in Chronic Poststroke Subjects.

Miller, Michael LU ; Flansbjer, Ulla-Britt LU and Lexell, Jan LU (2009) In American Journal of Physical Medicine & Rehabilitation 88. p.286-291
Abstract
Miller M, Flansbjer U-B, Lexell J: Voluntary activation of the knee extensors in chronic poststroke subjects. OBJECTIVE:: To assess the extent to which knee extensor muscle weakness in subjects with chronic mild to moderate poststroke hemiparesis is caused by a decreased voluntary activation. DESIGN:: Forty community dwelling and ambulant men and women (mean age, 59.8 +/- 5.5 yrs) with residual hemiparesis (19.2 +/- 8.5 mos poststroke) were tested. Torque measurements were performed on a computerized dynamometer and the superimposed electrical stimulation technique was used to assess voluntary activation of the knee extensors in both the paretic and the nonparetic lower limbs. RESULTS:: The mean voluntary activation ratio of the knee... (More)
Miller M, Flansbjer U-B, Lexell J: Voluntary activation of the knee extensors in chronic poststroke subjects. OBJECTIVE:: To assess the extent to which knee extensor muscle weakness in subjects with chronic mild to moderate poststroke hemiparesis is caused by a decreased voluntary activation. DESIGN:: Forty community dwelling and ambulant men and women (mean age, 59.8 +/- 5.5 yrs) with residual hemiparesis (19.2 +/- 8.5 mos poststroke) were tested. Torque measurements were performed on a computerized dynamometer and the superimposed electrical stimulation technique was used to assess voluntary activation of the knee extensors in both the paretic and the nonparetic lower limbs. RESULTS:: The mean voluntary activation ratio of the knee extensors in the nonparetic and paretic leg was 0.97 +/- 0.04 and 0.86 +/- 0.13, respectively. Subjects who had a greater relative weakness, implying a more pronounced poststroke impairment, also had lower voluntary activation ratios. The mean percentage difference in total torque between the nonparetic and the paretic knee extensors after the electrical stimulation was 36.4% +/- 17.0%. CONCLUSIONS:: Paretic knee extensor muscle weakness in chronic poststroke subjects is only partially explained by a reduced voluntary activation ability, indicating that other neuromuscular structural or functional factors contribute to poststroke hemiparetic muscle weakness. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
American Journal of Physical Medicine & Rehabilitation
volume
88
pages
286 - 291
publisher
Lippincott Williams & Wilkins
external identifiers
  • wos:000264451800007
  • pmid:19190483
  • scopus:63849302923
ISSN
1537-7385
DOI
10.1097/PHM.0b013e318198b569
language
English
LU publication?
yes
id
c7c3198f-e5b7-413e-91b3-64aa3707994a (old id 1302930)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/19190483?dopt=Abstract
date added to LUP
2009-03-04 17:13:47
date last changed
2017-01-01 07:53:16
@article{c7c3198f-e5b7-413e-91b3-64aa3707994a,
  abstract     = {Miller M, Flansbjer U-B, Lexell J: Voluntary activation of the knee extensors in chronic poststroke subjects. OBJECTIVE:: To assess the extent to which knee extensor muscle weakness in subjects with chronic mild to moderate poststroke hemiparesis is caused by a decreased voluntary activation. DESIGN:: Forty community dwelling and ambulant men and women (mean age, 59.8 +/- 5.5 yrs) with residual hemiparesis (19.2 +/- 8.5 mos poststroke) were tested. Torque measurements were performed on a computerized dynamometer and the superimposed electrical stimulation technique was used to assess voluntary activation of the knee extensors in both the paretic and the nonparetic lower limbs. RESULTS:: The mean voluntary activation ratio of the knee extensors in the nonparetic and paretic leg was 0.97 +/- 0.04 and 0.86 +/- 0.13, respectively. Subjects who had a greater relative weakness, implying a more pronounced poststroke impairment, also had lower voluntary activation ratios. The mean percentage difference in total torque between the nonparetic and the paretic knee extensors after the electrical stimulation was 36.4% +/- 17.0%. CONCLUSIONS:: Paretic knee extensor muscle weakness in chronic poststroke subjects is only partially explained by a reduced voluntary activation ability, indicating that other neuromuscular structural or functional factors contribute to poststroke hemiparetic muscle weakness.},
  author       = {Miller, Michael and Flansbjer, Ulla-Britt and Lexell, Jan},
  issn         = {1537-7385},
  language     = {eng},
  pages        = {286--291},
  publisher    = {Lippincott Williams & Wilkins},
  series       = {American Journal of Physical Medicine & Rehabilitation},
  title        = {Voluntary Activation of the Knee Extensors in Chronic Poststroke Subjects.},
  url          = {http://dx.doi.org/10.1097/PHM.0b013e318198b569},
  volume       = {88},
  year         = {2009},
}