Mapping of spastic muscle activity after stroke: difference between passive stretch and active contraction.
J Neuroeng Rehabil
; 21(1): 102, 2024 06 14.
Article
em En
| MEDLINE
| ID: mdl-38877589
ABSTRACT
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:
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, 180Ë/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:
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:
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 ChiCTR2000032245.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Músculo Esquelético
/
Acidente Vascular Cerebral
/
Eletromiografia
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Contração Muscular
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Espasticidade Muscular
Limite:
Adult
/
Aged
/
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
J Neuroeng Rehabil
Assunto da revista:
ENGENHARIA BIOMEDICA
/
NEUROLOGIA
/
REABILITACAO
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China