Mapping of spastic muscle activity after stroke: difference between passive stretch and active contraction.
HD-sEMG
Spasticity
Spatial heterogeneity
Stretch reflex
Voluntary movement
Journal
Journal of neuroengineering and rehabilitation
ISSN: 1743-0003
Titre abrégé: J Neuroeng Rehabil
Pays: England
ID NLM: 101232233
Informations de publication
Date de publication:
14 Jun 2024
14 Jun 2024
Historique:
received:
07
04
2022
accepted:
10
05
2024
medline:
15
6
2024
pubmed:
15
6
2024
entrez:
14
6
2024
Statut:
epublish
Résumé
Investigating the spatial distribution of muscle activity would facilitate understanding the underlying mechanism of spasticity. The purpose of this study is to investigate the characteristics of spastic muscles during passive stretch and active contraction by high-density surface electromyography (HD-sEMG). Fourteen spastic hemiparetic subjects and ten healthy subjects were recruited. The biceps brachii (BB) muscle activity of each subject was recorded by HD-sEMG during passive stretch at four stretch velocities (10, 60, 120, 180˚/s) and active contraction at three submaximal contraction levels (20, 50, 80%MVC). The intensity and spatial distribution of the BB activity were compared by the means of two-way analysis of variance, independent sample t-test, and paired sample t-test. Compared with healthy subjects, spastic hemiparetic subjects showed significantly higher intensity with velocity-dependent heterogeneous activation during passive stretch and more lateral and proximal activation distribution during active contraction. In addition, spastic hemiparetic subjects displayed almost non-overlapping activation areas during passive stretch and active contraction. The activation distribution of passive stretch was more distal when compared with the active contraction. These alterations of the BB activity could be the consequence of deficits in the descending central control after stroke. The complementary spatial distribution of spastic BB activity reflected their opposite motor units (MUs) recruitment patterns between passive stretch and active contraction. This HD-sEMG study provides new neurophysiological evidence for the spatial relationship of spastic BB activity between passive stretch and active contraction, advancing our knowledge on the mechanism of spasticity. ChiCTR2000032245.
Sections du résumé
BACKGROUND
BACKGROUND
Investigating the spatial distribution of muscle activity would facilitate understanding the underlying mechanism of spasticity. The purpose of this study is to investigate the characteristics of spastic muscles during passive stretch and active contraction by high-density surface electromyography (HD-sEMG).
METHODS
METHODS
Fourteen spastic hemiparetic subjects and ten healthy subjects were recruited. The biceps brachii (BB) muscle activity of each subject was recorded by HD-sEMG during passive stretch at four stretch velocities (10, 60, 120, 180˚/s) and active contraction at three submaximal contraction levels (20, 50, 80%MVC). The intensity and spatial distribution of the BB activity were compared by the means of two-way analysis of variance, independent sample t-test, and paired sample t-test.
RESULTS
RESULTS
Compared with healthy subjects, spastic hemiparetic subjects showed significantly higher intensity with velocity-dependent heterogeneous activation during passive stretch and more lateral and proximal activation distribution during active contraction. In addition, spastic hemiparetic subjects displayed almost non-overlapping activation areas during passive stretch and active contraction. The activation distribution of passive stretch was more distal when compared with the active contraction.
CONCLUSIONS
CONCLUSIONS
These alterations of the BB activity could be the consequence of deficits in the descending central control after stroke. The complementary spatial distribution of spastic BB activity reflected their opposite motor units (MUs) recruitment patterns between passive stretch and active contraction. This HD-sEMG study provides new neurophysiological evidence for the spatial relationship of spastic BB activity between passive stretch and active contraction, advancing our knowledge on the mechanism of spasticity.
TRIAL REGISTRATION
BACKGROUND
ChiCTR2000032245.
Identifiants
pubmed: 38877589
doi: 10.1186/s12984-024-01376-z
pii: 10.1186/s12984-024-01376-z
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
102Subventions
Organisme : National Natural Science Foundation of China
ID : No. 82202786
Organisme : Guangdong Basic and Applied Basic Research Foundation
ID : No. 2020A1515011356
Organisme : Guangzhou Research Collaborative Innovation Projects
ID : No. 201907010034
Organisme : Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences
ID : No. 2020-JKCS-005
Organisme : Natural Science Foundation of China
ID : No. 32071316, 31771016
Organisme : National Key Research and Development Program of China
ID : No. 2018YFC2001600
Organisme : Guangdong Science and Technology Plan Project
ID : No. 2020B1212060077
Organisme : Shenzhen Science and Technology Plan Project
ID : No. GJHZ20200731095211034
Informations de copyright
© 2024. The Author(s).
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