Effect of spinal cord injury and its lesion level on stretch reflex modulation by cold stimulation in humans.
Clin Neurophysiol
; 122(1): 163-70, 2011 Jan.
Article
em En
| MEDLINE
| ID: mdl-20580311
ABSTRACT
OBJECTIVE:
To determine how short-latency stretch reflex amplitude in the soleus muscle is modulated by cold stimulation in able-bodied individuals and individuals with complete spinal cord injury.METHODS:
An initial 100-s baseline period was followed by 50-s cold stimulation periods. Stretch reflex of the right soleus muscle was elicited for 10-s intervals, while cold stimulation was applied to the left thigh.RESULTS:
Peak-to-peak amplitude of the stretch reflex increased significantly during cold stimulation up to 127 ± 21% of the baseline in the able-bodied group (n=9, P<0.01). Similarly, stretch reflex increased up to 125 ± 11% in a group with injury level at or below thoracic 10 (n=4), although this increase was not significant. On the other hand, stretch reflex decreased significantly down to 78 ± 20% in a group with injury level at or above thoracic 6 (n=8, P<0.05).CONCLUSIONS:
Effect of afferent inputs induced by cold stimulation on stretch reflex modulation is different depending on the extent of central nervous systems participating in the modulation.SIGNIFICANCE:
Our findings provide a better understanding of some basic changes in afferent-efferent spinal reflex pathways which are probably not monosynaptic in nature.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Paralisia
/
Reflexo de Estiramento
/
Traumatismos da Medula Espinal
/
Reflexo Anormal
/
Temperatura Baixa
/
Músculo Esquelético
Tipo de estudo:
Etiology_studies
Limite:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Clin Neurophysiol
Assunto da revista:
NEUROLOGIA
/
PSICOFISIOLOGIA
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Japão