Identifying the characteristic acceleration patterns by using accelerographic analysis of the pelvis in normal working

Abstract

Using an accelerograph for objective evaluation of gait is a focus of attention, but the characteristic pattern for a basic index is not clear. In this study, we aimed to identify a common characteristic pattern from the normalized acceleration data of young people. An accelerometer was attached to the sacrum of pelvis and 3 different directions, back to front (X-axis), right and left (Y-axis) and above and below (Z-axis), were measured for 20 young people during normal walking. The acceleration pattern was extracted after normalizing the data to study the characteristic points. Among the same subjects, the characteristic pattern of acceleration in each direction showed a definitive tendency. In the mean data of 20 people, only X-axis showed the reflection of individual characteristics. Furthermore, in the Z-axis, the individual characteristic pattern was also reflected, but within the same subject group, the scatter tended to be regular so it was not necessarily evident in the data of 20 people. From the above results, in the pelvic acceleration of healthy young persons in walking, a characteristic pattern exists which has in common average values of the group as a whole as well as individual subjects.