Fig. 1

A Plantar pressure-based setup, with a force sensitive resistor (FSR) placed under the pad of the foot to measure changes in plantar pressure with contraction of the ankle plantar flexors; B standalone plantar pressure-based biofeedback system; C experimental protocol for validating the plantar pressure-based audiovisual biofeedback system against an EMG-based system (measuring and displaying soleus muscle activity), where both systems used an identical display of a real-time moving bar graph and horizontal target line with an audible “ding” when this target line was passed