Estimation of 2-D Center of Mass Movement During Trunk Flexion-Extension Movements Using Body Accelerations
Estimation of 2-D Center of Mass Movement During Trunk Flexion-Extension Movements Using Body Accelerations
复制标题
DOI：
10.1109/tnsre.2009.2032620
复制
发表时间：
2009-12-01
影响因子：
4.9
通讯作者：
Moussavi, Zahra M. K.
中科院分区：
文献类型：
--
作者：
Betker, Aimee L.;Szturm, Tony;Moussavi, Zahra M. K.
体重中心 (COM) 的运动和身体节段加速度信号通常用于指示站立活动期间的运动性能和稳定性。 COM 轨迹通常通过视频运动分析来计算，该方法的设置非常耗时，而且并非在所有临床环境中都容易获得。在本文中，我们提出了一种基于实验数据从上肢和下肢加速度估计 COM 轨迹的新方法。我们在四个躯干屈伸运动任务期间对二维髋部和躯干加速度数据与矢状面中的二维 COM 轨迹之间存在的关系进行了建模，并根据该模型估计了 COM 轨迹。该模型占最终 COM 轨迹变化的 93 +/- 9% 到 97 +/- 3%，具体取决于任务。这对应于真实和估计的 COM 轨迹之间的绝对误差范围为 0.65 +/- 0.62 至 1.07 +/- 1.13 cm。与我们之前关于 COM 轨迹估计的工作相比，该模型的优点是它不需要任何校准，并且提供了对 COM 轨迹的相当准确的估计，可用于研究任何临床环境中的人体平衡表现。
Motions of the center of body mass (COM) and body segment acceleration signals are commonly used to indicate movement performance and stability during standing activities. The COM trajectory is usually calculated by video motion analysis, which has a time consuming setup and also is not readily available in all clinical settings. In this paper, we present a novel method to estimate the COM trajectory from the upper and lower limb accelerations, based on experimental data. We have modeled the relationships that exist between the 2-D hip and trunk acceleration data with the 2-D COM trajectory in the sagittal plane, during four trunk flexion-extension movement tasks and estimated the COM trajectory based on that model. The model accounted for between 93 +/- 9% to 97 +/- 3% of the resultant COM trajectory's variability, depending on the task. This corresponded to a range of absolute error between the true and estimated COM trajectories of 0.65 +/- 0.62 to 1.07 +/- 1.13 cm. The advantage of this model compared to our previous work on COM trajectory estimation is that it does not require any calibration and provides a reasonably accurate estimation of the COM trajectory, which can be used to study human balance performance in any clinical setting.