Fig 1. Soleus H-reflex recruitment curves before and after repeated transspinal stimulation in individuals with and without SCI.

Soleus H reflexes recorded at increasing stimulation intensities until the H reflex reached maximal amplitudes as a percentage of the Mmax are plotted against the predicted 50% of maximal H-reflex stimulus intensity (S50-Hmax) observed at baseline. Soleus H reflexes before (green) and after (black) cathodal transspinal stimulation are indicated separately for the left and right legs, and from both legs for AIS C-D, AIS A-B, and healthy control subjects. *p < .05, significant differences of reflexes recorded before and after stimulation. Error bars not indicated for clarity purposes.