Discussion
Here, we examined the impact of tDCS delivered during an active motor task on the excitability of a spinal reflex pathway. The size of soleus submaximal H-reflex showed some rapid and temporary changes during 30-min of tDCS over the leg M1. During the first minutes of Active and Sham tDCS, H-reflex size increased, and then within the following several minutes it returned to near pre-tDCS size. The return to baseline appeared to occur more rapidly with Active tDCS. Similar to several previous studies (Nitsche et al. 