Crossed inhibition of the soleus H reflex during passive pedalling movement.
Brain Res
; 779(1-2): 280-4, 1998 Jan 01.
Article
de En
| MEDLINE
| ID: mdl-9473695
ABSTRACT
We hypothesized that sensory input from the moving leg induces presynaptic inhibition of the soleus H reflex pathway in the contralateral stationary leg. The results showed a crossed inhibition during passive pedalling movement of the leg, which was not removed by low levels of tonic contraction of soleus in the stationary leg. The inhibition was correlated exponentially to the rate of the movement (R2 = 0.934, P < 0.05) and was not dependent on the quadrants through which the moving leg was passing. Static flexion of the stationary leg caused ipsilateral inhibition of the reflexes (t = 5.590, P < 0.05), independent of the orientations of the other leg. We concluded that sensory inflow from the moving leg induces presynaptic inhibition in the stationary leg, that a complex transformation of the sensory input in the spinal cord or brain underlies the tonic crossed inhibition and phasic ipsilateral inhibition, and that descending motor commands exert a powerful control over these sensorimotor modulatory mechanisms.
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Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Muscles squelettiques
/
Réflexe H
/
Jambe
/
Mouvement
/
Inhibition nerveuse
Limites:
Adult
/
Humans
Langue:
En
Journal:
Brain Res
Année:
1998
Type de document:
Article
Pays d'affiliation:
Canada