Table 2.
The definitions of gait parameters.
| Gait Parameter | Definition | RMSE (Validated in [24]) |
|---|---|---|
| Stride length (SL) | The height-normalized linear displacement between two adjacent ankle landing points. | 2.3 m |
| Gait cycle duration (GD) | The duration between two adjacent HS events. | 14 ms |
| Percentage swing phase (PSP) | The duration between adjacent TO event and HS event divided by GD. | no validated |
| Max ankle height (MH) | The maximum value of height-normalized ankle displacement in V-axis direction during the gait cycle. | 1.0 cm |
| Range of lateral displacement (RL) | The range of height-normalized displacement along the L-axis direction during the gait cycle. | no validated |
| Range of shank Z-axis rotation (RSZ) | The range of the integration of IMU Z-axis angular velocity during the gait cycle. | no validated |
| Range of shank Y-axis rotation (RSY) | The range of the integration of IMU Y-axis angular velocity during the gait cycle. | no validated |
| Range of shank X-axis rotation (RSX) | The range of the integration of IMU X-axis angular velocity during the gait cycle. | no validated |
| Max ankle progressive velocity (MPV) | The maximum value of height-normalized ankle velocity in P-axis direction during the gait cycle. | 3.0 cm/s |
| Max ankle vertical velocity (MVV) | The maximum value of height-normalized ankle velocity in V-axis direction during the gait cycle. | no validated |
| Max shank Z-axis angular velocity (MSV) | The maximum value of IMU z-axis angular velocity during the swing phase. | no validated |
| Ankle displacement at MH (MHD) | The height-normalized ankle displacement in P-axis direction when MH occurs. | 1.9 cm |