| sEMG | surface electromyography |
| R2b | the distance between maximal and minimal position of central of pressure anterior/posterior in the 2nd phase |
| COP A/P | central of pressure anterior/posteriori |
| SD | standard deviation |
| LoS | limits of stability |
| EEG | electroencephalography |
| TA | tibialis anterior muscle |
| SOL | soleus muscle |
| SENIAM | Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles |