【作者】 武明； 季林红； 金德闻； 朱庆峰； 王人成； 张济川；

【Author】 Wu Ming, Ji Ling Hong, Jing De Weng et al.Department of Precision Instruments, Tsinghua University, Beijing, P. R. China,100084

【机构】 清华大学精密仪器与机械学系；

【摘要】 目的 人体动力学稳定区域是人体运动平衡的重要评价指标之一,它对疾病的诊断、康复具有重要意义.方法 从能量分析的角度提出了人体平衡的动力学稳定区域.并以人体两刚体倒立摆模型为例,计算了其动力学稳定区域的前后边界,分析了动力学稳定区域与肢体动力学特征之间的能量关系.结果 由于考虑了肢体动力学特性对稳定区域的影响,能更准确地预测人体运动的稳定程度.该方法更适合人体质心有较大位移及速度运动时的稳定性分析.分析了人体踝关节力矩对其稳定区域的影响.结论 基于能量的人体动力学稳定区域是人体运动平衡的有效评价指标之一.踝关节力矩的减弱会导致稳定区域的明显减少,而且对稳定区域前边界的影响较后边界更明显,即踝关节肌肉力矩的减弱会导致更多的向前跨步来保持平衡.这与临床观察到的老年人跨步平衡策略是一致的.更多还原

【Abstract】 Objective Dynamic stability region is one of the most important criteria for balance of human locomotion, which is significant for illness diagnosis and rehabilitation. Method A dynamic stability region, which based on energy analyses, is promoted. Two - segment model of human body is employed to map the anterior and posterior boundaries of stability region with optimization algorithm, then the en-ergy relationship between the dynamic characteristic of body and dynamic stability region is examined. Result The dynamic criterion, which based on energy, has advantages over static stability region in predication of stability of human body’s locomotion, because it integrates the influence of position of center of mass and dynamic characters of human body’s locomotion on the stability margin. It can be employed to predict the dynamic stability of human locomotion when a large displacement or velocity of mass center has occurred. In addition, the influence of reduction of muscle strength on the stability margin has been analyzed by computer simulation. Conclusion The reduction of ankle muscle strength results in apparent decrease of stability region. And also, more reductions have been found on anterior boundary of stability region than posterior boundary, e.g. subject with a reduction of ankle muscle strength prefers to take forward step to keep balance than steps to keep balance than the young even on a small disturbance.更多还原