| FOG | Freezing of Gait |
| PD | Parkinson’s Disease |
| EMG | Electromyography |
| GC | gastrocnemius |
| TA | Tibialis Anterior |
| IMU | Inertial Measurement Unit |
| sEMG | Surface EMG |
| RMS | root mean square |
| CMRR | common mode rejection ratio |
| SNR | signal to noise ratio |
| HP | high-pass |
| LP | low-pass |
| ABS | normalized absolute value of the averaged angular velocity |
| R | ratio between the maximum value of ABS and the corresponding sEMG value |
| PSD | Power Spectral Density |
| FIR | Finite Impulse Response |
| PI | FOG phenotype index |
| APA | anticipatory postural adjustments |
| MDS-UPDRS | Modified Disorder Society-Unified Parkinson’s Disease Rating Scale |
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