Modulation of Renshaw cell activity from supine to standing.
The purpose of this study was to quantify changes in Renshaw cell activity from supine to standing and determine the relationship between these changes and changes in the soleus H-reflex. Ten young subjects were tested using an indirect measure of Renshaw cell activity. Twelve test and twelve conditioned H-reflexes were collected during both supine and standing conditions. All subjects significantly increased Renshaw cell activity from supine to standing. Furthermore, there was a significant correlation between the changes in H-reflex and Renshaw cell activity. As the co-contraction requirement of the system increased, Renshaw cell activity also increased.
Mynark
Richard G
RG
Motor Control Laboratory, Department of Exercise & Sport Science, University of North Carolina, Chapel Hill, North Carolina 27599, USA. rgm@unc.edu
D000328:Adult; D004558:Electric Stimulation / Q000379:methods; D004576:Electromyography / Q000379:methods; D005260:Female; D006181:H-Reflex / Q000502:physiology*; D006801:Humans; D007395:Interneurons / Q000187:drug effects / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction / Q000502:physiology / Q000528:radiation effects; D018482:Muscle, Skeletal / Q000502:physiology / Q000528:radiation effects; D009433:Neural Inhibition / Q000502:physiology* / Q000528:radiation effects; D011187:Posture / Q000502:physiology*; D012044:Regression Analysis