Abstract
In human gait motion analysis, which is one useful method for efficient physical rehabilitation, ground reaction forces, kinetic and kinematic parameters are measured. For obtaining these data as the unrestrained gait measurement, a novel gait motion analysis system using mobile force plate and attitude sensor has been developed. However, it has been used at only specially-cleaned experimental laboratory. In this study, ground reaction forces and joint position applied on the lower limb of healthy subjects are measured by two measurement methods. One is a traditional way: a combination of force sensor based on ground and motion capture system. And the other is wearable measurement system composed of mobile force plate and attitude sensor. By compering this two measured results, we can evaluate the accuracy of the wearable measurement system. As a result of the experiments, vertical component of ground reaction force and knee joint angle are measured with a high degree of accuracy. On the other hand, antenior-postenior and medial-lateral components of the force and ankle and hip joint angles showed different results. The data measured by wearable system are mostly larger. Precision placement of attitude sensor is very difficult as the figure of lower limbs is different one by one, and this may be the reason. Future subject is structuring a new algorithm to set off a declination of attitude sensor position.
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