National Key Laboratory of Human Factors Engineering,China Astronauts Research and Training Center
目的 研究重力水平对步态行走时下肢关节运动的影响规律。方法 设计了一种可随动的悬吊式低重力模拟装置用于不同重力水平的模拟,利用运动捕捉系统(Motion)和三维测力台(Kistler)对12名受试者在正常重力(1 G)、火星重力(1/3 G)及月球重力(1/6 G)下步态行走时下肢关节运动参数进行了测量。 结果 计算并分析了12例研究对象不同重力环境下步态行走时髋关节、膝关节、踝关节在一个步态周期内矢状面上关节角度、关节力、关节力矩的变化曲线,得到了不同重力环境下步态行走时下肢关节的关节活动范围。结论 重力水平对步态行走时下肢矢状面的关节运动有显著影响,重力水平降低后,髋关节、膝关节矢状面的关节活动范围显著减小,踝关节矢状面的关节活动范围显著增加；低重力环境下,下肢关节在矢状面上的关节力、关节力矩明显减小。
Objective To research the influence of gravity on lower limb motions during human walking. Methods A suspended microgravity simulation system was designed for the experiment. Biomechanics data in walking of twelve volunteers were measured by the motion capture system (Motion) and 3D force plate (Kistler) under simulated Mars gravity (1/3 G) and lunar gravity (1/6 G), and earth gravity (1 G). Results The curves of joint angle, joint force and joint torque in hip, knee and ankle joints for 12 subjects in sagittal plane within one gait cycle under different gravity were calculated and analyzed．The motion ranges of lower limb joints during human walking under different gravity were obtained. Conclusions Gravity had a major influence on lower limb motions during human walking. Under simulated Mars and lunar gravity, the motion ranges of hip and knee joints in sagittal plane were significantly decreased while the motion range of ankle joints was increased. In addition, the joint force and joint torque of lower limb joints in sagittal plane under lower gravity were also decreased a lot.