Measurement of the total body center of gravity during sit-to-stand motion using a markerless motion capture system

Medical Engineering & Physics
Ryo TanakaHiromichi Kawanishi

Abstract

In order to evaluate the movement strategy in sit-to-stand (STS) motion, it is necessary to measure the center of gravity (COG). However, there is no established method for enabling this using convenience device in the clinical setting. The purpose of this study was to validate the measurement of the COG during the STS motion using an inexpensive, portable and markerless motion capture system (MLS). Eighteen healthy adults participated in our study. The coordinates of the joint centers during the STS motion were collected using the Microsoft Kinect system (as a MLS) and the Vicon system (as a marker-based motion capture system [MBS]). The center of mass of each segment-which was calculated based on the segmental mass and length-were synthesized to calculate the COG. The displacement, velocity, acceleration of the COG during the STS motion were calculated from the data obtained using each system and compared between systems. The two systems showed significant difference in their measurements of displacement in both the vertical and anteroposterior directions. However, in the anteroposterior direction, there was no significant difference in the measurements of either velocity or acceleration. Our results suggested the validity of...Continue Reading

Citations

Aug 17, 2020·International Journal of Environmental Research and Public Health·Gracia Castro-Luna, Diana Jiménez-Rodríguez
Sep 2, 2021·Medical & Biological Engineering & Computing·Manuel Trinidad-FernándezManuel González-Sánchez

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