AP	Antero-posterior
CoP	Center of pressure
CoPamp	Maximal amplitude of center of pressure displacement
CoPvel	Mean center of pressure velocity
EC	Eyes closed
EMG	Electromyography/electromyogram (surface EMG recordings)
EO	Eyes open
GM	Gastrocnemius medialis
Ia	Group Ia muscle spindle afferents
ML	Medio-lateral
MVC	Maximal voluntary contraction
SOL	Soleus muscle
TA	Tibialis anterior
VR	Virtual reality