Open Access
Table 2
Identification method of all variables for Kinect and motion capture system.
| Variables | Kinect | Motion capture |
|---|---|---|
| Gait speed (m/s) | Mean velocity of the spine base in the AP plane | Mean velocity calculated from the time and distance between one heel strike and the next heel strike, judged from the pressure sensing device |
| Gait cycle time (s) | Time between one heel strike and the next heel strike, judged from hip-knee cyclogram | The time between one heel strike and the next heel strike, judged from the pressure sensing device |
| Step length (m) | The length between one and another ankle in the AP plane | The length between one and another toe |
| Hip joint angle (degree) | The angle between the “hip-knee vector” and the “vertical axis” in the AP plane | The angle between the “hip-knee vector” and the “vertical axis” in the 3D coordinates axis, judged from motion capture |
| Knee joint angle (degree) | The angle between the “knee-hip vector” and the “knee-ankle vector” in the AP plane | |
| Ground contact time of foot (s) | The time of the “ankle velocity” in the AP plane exceeding a threshold of +1 m/s | Time between one heel strike and toe off, judged from pressure sensing device |
| Maximum ankle velocity (m/s) | The maximum velocity of the ankle in the AP plane | The maximum velocity of the ankle in the AP plane |
AP: anteroposterior.
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