Effect of afferent input on motor cortex excitability during stroke recovery.
Clin Neurophysiol
; 123(12): 2429-36, 2012 Dec.
Article
em En
| MEDLINE
| ID: mdl-22721651
ABSTRACT
OBJECTIVE:
Afferent input is proposed to mediate its effect on motor functions by modulating the excitability of the motor cortex. We aimed to clarify - in a longitudinal study - how afferent input affects motor cortex excitability after stroke and how it is associated with recovery of hand function.METHODS:
The motor cortex excitability was studied by measuring the reactivity of the motor cortex beta rhythm to somatosensory stimulation. We recorded the amplitude of the suppression and subsequent rebound of the beta oscillations during tactile finger stimulation with MEG in 23 first-ever stroke patients within one week and at 1 and 3 months after stroke, with concomitant evaluation of hand function.RESULTS:
The strength of the beta rhythm rebound, suggested to reflect decreased motor cortex excitability, was weak in the affected hemisphere after stroke and it was subsequently increased during recovery. The rebound strength correlated with hand function tests in all recordings.CONCLUSION:
Motor cortex excitability is modulated by afferent input after stroke. The motor cortex excitability is increased in the AH acutely after stroke and decreases in parallel with recovery of hand function.SIGNIFICANCE:
The results implicate the importance of parallel recovery of both sensory and motor systems in functional recovery after stroke.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Córtex Somatossensorial
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Recuperação de Função Fisiológica
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Acidente Vascular Cerebral
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Córtex Motor
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Neurônios Aferentes
Tipo de estudo:
Observational_studies
/
Risk_factors_studies
Limite:
Female
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Humans
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Male
/
Middle aged
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article