Table 2.
Summary of average ± std motion capture (mocap) and inertial measurement unit (IMU) values for each metric in both the active (A) and transparent (T) modes, along with the mean and percent error for between ground truth motion capture and IMU-estimated values
| Mocap value (cm) | IMU value (cm) | Mean error (cm) | Percent error (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| P | NP | P | NP | P | NP | P | NP | ||
| SL | A | 120.2 ± 29.0 | 120.2 ± 28.9 | 122.6 ± 29.8 | 123.5 ± 28.7 | 2.4 ± 1.3 | 3.3 ± 1.6 | 1.9 ± 0.7 | 2.9 ± 1.5 |
| T | 117.7 ± 31.5 | 118.1 ± 31.4 | 120.3 ± 32.5 | 121.9 ± 31.0 | 2.6 ± 1.1 | 3.8 ± 2.3 | 2.1 ± 0.6 | 3.5 ± 1.9 | |
| MLD | A | 6.0 ± 2.2 | 2.8 ± 1.0 | 6.1 ± 1.9 | 3.0 ± 0.9 | 0.1 ± 0.4 | 0.2 ± 0.3 | 3.3 ± 6.4 | 10.9 ± 14.4 |
| T | 5.9 ± 2.5 | 2.5 ± 0.8 | 5.9 ± 2.3 | 2.7 ± 0.9 | −0.0 ± 0.3 | 0.2 ± 0.4 | 1.1 ± 4.4 | 9.9 ± 19.1 | |
| MVD | A | 12.6 ± 4.0 | 17.8 ± 1.5 | 12.2 ± 3.6 | 17.2 ± 1.3 | −0.4 ± 0.5 | −0.6 ± 0.6 | −2.7 ± 3.1 | −3.5 ± 3.4 |
| T | 11.9 ± 4.0 | 17.8 ± 1.7 | 11.6 ± 3.5 | 17.4 ± 1.6 | −0.3 ± 0.8 | −0.3 ± 0.7 | −1.6 ± 4.5 | −1.8 ± 3.7 | |
Abbreviations: MLD, maximum lateral displacement; MVD, maximum vertical displacement; NP, nonparetic; P, paretic; SL, stride length.