The validity of a running motion analysis device using inertial navigation system

The purpose of this study was to analyze the traveling motion by a running motion analysis device (sensor device) using an inertial navigation system with a proprietary triaxial acceleration sensor and gyro sensor and 3 dimensional motion analysis system (VICON). The validity of the sensor devise as a motion analysis device was examined by comparing the analysis results of the running motion. As a result, the intraclass correlation coefficient (ICC) was 0.9 or more at speed, vertical motion, contact time, brake, landing angle and kicking out angle. The degree of agreement between the above two analysis index values between the two devices was regarded as excellent. By Bland-Altman analysis, it was recognized that the degree of coincidence of each analysis index value was high, and the difference was confirmed to be within the error range. In some items, the sensor device was more accurate than VICON and the possibility of measurement could be considered sufficiently. From the above results, it can be said that the accuracy of the sensor device developed independently and the accuracy of the algorithm used for motion analysis were recognized, and the validity as a motion analysis device was recognized.