Section: Original Research
Authors: Yoichi Iino and Takeji Kojima
Affiliations: The authors are with the Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.
Abstract
This study investigated the validity of the top-down approach of inverse dynamic analysis in fast and large rotational movements of the trunk about three orthogonal axes of the pelvis for nine male collegiate students. The maximum angles of the upper trunk relative to the pelvis were approximately 47º, 49º, 32º, and 55º for lateral bending, flexion, extension and axial rotation, respectively, with maximum angular velocities of 209º/s, 201º/s, 145º/s, and 288º/s, respectively. The pelvic moments about the axes during the movements were determined using the top-down and bottom-up approaches of inverse dynamics and compared between the two approaches. Three body segment inertial parameter sets were estimated using anthropometric data sets (Ae et al., Biomechanism 11, 1992; De Leva, J Biomech, 1996; Dumas et al., J Biomech, 2007). The root-mean-square errors of the moments and the absolute errors of the peaks of the moments were generally smaller than 10 Nm. The results suggest that the pelvic moment in motions involving fast and large trunk movements can be determined with a certain level of validity using the top-down approach in which the trunk is modeled as two or three rigid-link segments.
Keywords: segment inertial parameters, joint moment, pelvis
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