Table 1.
Comparison of lower-extremity joint angles between the IMU and Mocap systems.
| (Unit: deg) | Variable | System | Mean ± SD | t (p) |
|---|---|---|---|---|
| Hip-joint angle (+ flexion / − extension) |
Max | IMU | 27.18 ± 4.66 | 1.88 (0.09) |
| Mocap | 25.70 ± 3.85 | |||
| Min | IMU | −12.97 ± 3.83 | 1.83 (0.10) | |
| Mocap | −14.41 ± 2.23 | |||
| ROM | IMU | 39.89 ± 3.81 | 0.01 (1.00) | |
| Mocap | 39.88 ± 3.22 | |||
| Knee-joint angle (+ flexion /− extension) |
Max | IMU | 67.66 ± 5.79 | 3.29 (0.01) * |
| Mocap | 64.58 ± 5.21 | |||
| Min | IMU | −5.66 ± 5.79 | −1.84 (0.10) | |
| Mocap | −3.18 ± 3.11 | |||
| ROM | IMU | 72.67 ± 5.34 | 7.07 (0.01) * | |
| Mocap | 67.20 ± 4.66 | |||
| Ankle-joint angle (+ dorsi flexion /− plantar flexion) |
Max | IMU | 9.63 ± 2.90 | −5.33 (0.01) * |
| Mocap | 12.66 ± 2.71 | |||
| Min | IMU | −23.16 ± 5.09 | −5.20 (0.01) * | |
| Mocap | −19.44 ± 3.79 | |||
| ROM | IMU | 31.84 ± 5.75 | 0.15 (0.89) | |
| Mocap | 31.71 ± 4.97 |
* indicates a significant difference; IMU: Inertial Measurement Unit; Mocap: Motion capture system; ROM: Range of Motion.