| BF | Biceps femoris |
| EMG | Electromyography |
| GM | Gastrocnemius medialis |
| NSI | Normalized symmetry index |
| RF | Rectus femoris |
| SD | Standard deviation |
| SENIAM | Surface EMG for a non-invasive assessment of muscles |
| Sol | Soleus |
| TA | Tibialis anterior |
| VL | Vastus lateralis |
| VM | Vastus medialis |
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