Rapid increase in H-reflex size with both Active and Sham tDCS
Unexpectedly, we found with both Active and Sham tDCS, submaximal H-reflexes measured at one minute after tDCS onset (i.e., T1, the measurement started 30 s after the ramp-up was completed for the Active tDCS group and at the end of ramp-down for the Sham tDCS group) were, on average, about 6% larger than the pre-tDCS (i.e., T0) H-reflexes. It is unlikely that this temporary increase in H-reflex size was caused by the soleus H-reflex elicitation/measurement procedures used in the present study. In the previous soleus H-reflex and stretch reflex studies in neurologically normal individuals, there was no systematic time-dependent change in the size of soleus reflexes over the course of 225–245 reflex trials over 30–40 min (Thompson et al. 