N. Hakamada and K. Funato, "Estimation of Center of Gravity Obtained from 3D Whole Body Scanning Anthropometry Method", in Proc. of 1st Asian Workshop on 3D Body Scanning Technologies, Tokyo, Japan, 2012, pp. 64-70, http://dx.doi.org/10.15221/A12.064.
Estimation of Center of Gravity Obtained from 3D Whole Body Scanning Anthropometry Method
Noriko HAKAMADA 1, Kazuo FUNATO 2
1 Nippon Sport Science University, Tokyo, Japan;
2 Graduate School of Health and Sport Science, Nippon Sport Science University, Tokyo, Japan
Introduction: In the past, body segmental volume was measured from various methods as immersion method, mathematical model, photogrammetric, have been used for various research in biomechanics. As for the three dimensional anthropometry how there are a whole body volume and each segment volumes, possibility of estimation of various body segment parameter will be shown. Purpose of this study was estimated center of mass using three dimensional anthropometry.
Methods: The subjects were 6 males (Age:22.3±1.1 years, body height: 172.5±5.9cm, body mass: 67.2±2.5kg) participated in this study. We used Body line scanner ( BLS: Hamamatsu Photonics KK) for 3D Whole body anthropometry. Subjects were measured a whole body volume using BLS. Scanning data obtained from BLS was distributed 14 parts of each segmental volumes using anatomical randmarkpoint, be calculated each segmental volumes. For the definition of each segment were used from C.E.Clauser,1969. Center of each segmental mass (SCOM) was calculated from each segmental volume. Segment mass (SM) was calculated using each segment density which from preceding study. Center of gravity (COGABS) and COGREL (center of gravity expressed as a percentage of the body height) was calculated from SCOM and SM of each segment. For the measurement of the COGABS and COGREL, the reaction board method was employed. The reaction board consisted of a rigid board (180×91.5×2.5cm) mounted on a scale. COGABS and COGREL were compared from each method that calculated from reaction board, BLS and predicted value from C.E.Clauser,1969, and calculated %Difference.
Results and Discussion: The whole body mass that we estimated using BLS compared with body weight, the difference was under 1.5%. %difference of COGABS and COGREL (BLS and a measurement) were 2.9±0.9%, and the BLS showed lower than measurement (measured: COGABS=97.2±3.6cm, COGREL=56.6±0.5%, BLS: COGABS=94.4±3.0cm, COGREL=54.9±0.5%). In addition, the predicted value showed higher than a measurement (predicted value: COGABS=100.1±3.5cm, COGREL=58.3±0.6%). Conclusion: It was suggested that We can estimate COG which we estimated from segment mass and center of volume with an measured and a difference of 2.9%.
3d whole body scanning anthropometry, segmental volume, center of mass
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