Schematic representation of the experimental setup.

<p>Subject positioned during the force (left part) and position tasks (right part). In the force task (FT), the right foot was strapped to a pedal connected to a force transducer and the subjects had the ongoing plantarflexion force as visual feedback (signals from the force transducer). In the position task (PT), the pedal was attached to the load via a pulley system and visual feedback of the ankle angle (signals from the accelerometer, depicted at the right side of the base of the pedal) was provided. The scheme shows the location of recording and stimulation electrodes (connected with blue and red wires, respectively) for posterior tibial nerve and common peroneal nerve stimulation and for soleus, tibialis anterior, semitendinosus, and vastus lateralis EMG acquisition.