Fig. 1

Placement of Simulating and Recording Electrodes. Two TENS stimulating electrodes are placed vertically along the superficial tibial nerve in the popliteal space. The soleus EMG activity was measured with sensing and reference electrodes aligning with the muscle fibers and connected to the positive and negative channel 1 (CH1) terminals of the BioRadio. The EMG signal was grounded with a third electrode placed on the medial malleolus