EMG and ground reaction force recorded during standing with different stimulation amplitudes.

<p>EMG and ground reaction force recorded from participant A53 during standing with three different stimulation amplitudes (1.0, 3.0 and 5.0 V) delivered at either 25 Hz or 50 Hz. Electrode configuration (cathodes in black, anodes in grey, and non-active in white) is reported. MH: medial hamstring; VL: vastus lateralis; TA: tibialis anterior; SOL: soleus.