Lateralized a-motoneuron excitabilities during lying and standing of healthy individuals in relation to XXXX .

@entity1 @entity2003 @entity191
OBJECTIVES: To elucidate mechanisms of @entity2003 by assessing excitability of alpha-motoneurons innervating right and left soleus muscles in healthy controls and @entity191 ( @entity191 ) @entity1 with @entity2003 in the right, left and both legs. METHODS: One group of 45 controls was recruited and 60 @entity191 @entity1 in three groups: @entity2003 , predominantly in the right, left and both legs. H-reflex (H) and muscle response (M) were recorded from right and left soleus muscles during stimulations of the posterior tibial nerve at the popliteal fossa while lying and standing. The H/M ratio was taken as an index for motoneuron excitability. RESULTS: Mean H/M ratios were significantly different on the right and left sides, modified by postural changes in controls and @entity191 @entity1 . Analysis of variance showed that in healthy subjects the H/M ratio was: standing>lying (right), lying>standing (left). In right leg @entity2003 @entity1 , the H/M ratio was greatest during standing, and smallest during lying. In @entity2003 @entity1 , the H/M ratios on the right and left sides were equally independent of posture. In controls, left H/M>right while lying, <right while standing. In right leg @entity2003 @entity1 , right H/M>left, but <right in @entity2003 @entity1 , independent of posture. There was no side difference in @entity1 with @entity2003 in both legs. CONCLUSIONS: (i) motoneuron excitability may show side and postural differences in healthy individuals and @entity191 @entity1 ; (ii) posture may be associated with lateralized motoneuron excitability in these subjects; and (iii) @entity2003 may have spinal motor origins.
