Winter Samantha L, Forrest Sarah M, Wallace Joanne, Challis John H
1 University of Kent.
2 Aberystwyth University.
J Appl Biomech. 2018 Apr 1;34(2):89-95. doi: 10.1123/jab.2016-0307. Epub 2018 Mar 20.
The purpose of this study was to validate a new geometric solids model, developed to address the lack of female-specific models for body segment inertial parameter estimation. A second aim was to determine the effect of reducing the number of geometric solids used to model the limb segments on model accuracy. The full model comprised 56 geometric solids, the reduced model comprised 31, and the basic model comprised 16. Predicted whole-body inertial parameters were compared with direct measurements (reaction board, scales), and predicted segmental parameters with those estimated from whole-body dual x-ray absorptiometry scans for 28 females. The percentage root mean square error (%RMSE) for whole-body volume was <2.5% for all models and 1.9% for the full model. The %RMSE for whole-body center of mass location was <3.2% for all models. The %RMSE whole-body mass was <3.3% for the full model. The RMSE for segment masses was <0.5 kg (<0.5%) for all segments; Bland-Altman analysis showed the full and reduced models could adequately model thigh, forearm, foot, and hand segments, but the full model was required for the trunk segment. The proposed model was able to accurately predict body segment inertial parameters for females; more geometric solids are required to more accurately model the trunk.
本研究的目的是验证一个新的几何实体模型，该模型是为解决缺乏用于估计身体节段惯性参数的女性特定模型而开发的。第二个目的是确定减少用于模拟肢体节段的几何实体数量对模型准确性的影响。完整模型由56个几何实体组成，简化模型由31个组成，基本模型由16个组成。将预测的全身惯性参数与直接测量值（反应板、秤）进行比较，并将预测的节段参数与从28名女性的全身双能X线吸收法扫描估计的参数进行比较。所有模型的全身体积均方根误差百分比（%RMSE）<2.5%，完整模型为1.9%。所有模型的全身质心位置%RMSE<3.2%。完整模型的全身质量%RMSE<3.3%。所有节段的节段质量RMSE<0.5 kg（<0.5%）；Bland-Altman分析表明，完整模型和简化模型能够充分模拟大腿、前臂、足部和手部节段，但躯干节段需要完整模型。所提出的模型能够准确预测女性的身体节段惯性参数；需要更多的几何实体来更准确地模拟躯干。
