[Purpose] To quantitatively evaluate smoothness during standing and sitting motionanalysis using an accelerometer and to clarify the relationship between indices.[Participants and Methods] Seventeen healthy males participated in this study. We attacheda 9-axis motion sensor to the spinous process of the third lumbar spine and measured theacceleration of standing and sitting motions under normal and unstable conditions. Weestimated and compared the root mean square and entropy in the lateral, vertical,longitudinal, and triaxial composite directions. [Results] On comparing both conditions,the unstable condition indices were significantly high, except for the lateral directionof entropy. The root mean square was significantly negatively correlated with entropyunder normal conditions. [Conclusion] The study results suggested that the accelerationindex quantitatively evaluates motion smoothness. Since each index had differentcharacteristics, the motion-specific index was observed to be significant.
展开▼
