Yamasaki Hiroshi R, Kambara Hiroyuki, Koike Yasuharu
Department of Physical Therapy, Showa University, Yokohama, Japan.
J Appl Biomech. 2011 Nov;27(4):306-13. doi: 10.1123/jab.27.4.306. Epub 2011 May 26.
The purpose of this study was to clarify criteria that can predict trajectories during the sit-to-stand movement. In particular, the minimum jerk and minimum torque-change models were examined. Three patterns of sit-to-stand movement from a chair, i.e., upright, natural, and leaning forward, were measured in five young participants using a 3-D motion analysis device (200 Hz). The trajectory of the center of mass and its smoothness were examined, and the optimal trajectories predicted by both models were evaluated. Trajectories of the center of mass predicted by the minimum torque-change model, rather than the minimum jerk model, resembled the measured movements in all rising movement patterns. The upright pattern required greater extension torque of the knee and ankle joints at the instant of seat-off. The leaning-forward pattern required greater extension hip torque and higher movement cost than the natural and upright patterns. These results indicate that the natural sit-to-stand movement might be a result of dynamic optimization.
本研究的目的是阐明能够预测从坐到站运动过程中轨迹的标准。特别地，对最小加加速度和最小扭矩变化模型进行了研究。使用三维运动分析设备（200Hz）对五名年轻参与者从椅子上进行的三种坐立运动模式，即直立、自然和前倾模式进行了测量。研究了质心轨迹及其平滑度，并评估了两种模型预测的最优轨迹。在所有起身运动模式中，由最小扭矩变化模型而非最小加加速度模型预测的质心轨迹与测量运动相似。直立模式在离座瞬间需要膝关节和踝关节更大的伸展扭矩。前倾模式比自然和直立模式需要更大的髋关节伸展扭矩和更高的运动成本。这些结果表明，自然的从坐到站运动可能是动态优化的结果。
