Stair ascent and descent at different inclinations
Stair ascent and descent at different inclinations
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DOI：
10.1016/s0966-6362(01)00162-x
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发表时间：
2002-02-01
期刊：
影响因子：
2.4
通讯作者：
Frigo, C
中科院分区：
文献类型：
--
作者：
Riener, R;Rabuffetti, M;Frigo, C
本研究的目的是研究人类在不同倾角爬楼梯时的生物力学和运动协调性。十名正常受试者以三种不同的倾斜度（24 度、30 度、42 度）上下五级楼梯。三个台阶配备了力传感器，并提供 6 自由度的地面反应。通过基于相机的光电系统对运动学进行了分析。应用逆动力学方法来计算关节力矩和功率。分析了楼梯上升和下降的不同运动学和动力学模式，并将其与水平行走模式进行了比较。时间步态周期参数和地面反应不受楼梯倾斜度的显着影响。关节角度和力矩对倾斜度的依赖性相对较低但显着。在联合权力中观察到了很大的影响。这可能与肌肉必须产生（上升期间）或吸收（下降期间）的势能的变化量有关。楼梯行走的运动学和动力学与水平行走有很大不同。有趣的是，没有发现明确的迹象表明从水平行走到楼梯行走时运动模式存在适应或转变。这可以从脚的位置中清楚地看出：与水平行走相比，前脚首先着地，与攀登方向和倾斜度无关。这一发现和进一步的发现表明，存在一定的倾斜角度或角度范围，受试者确实可以在水平行走和楼梯行走步态模式之间切换。 (C) 2002 Elsevier Science B.V. 保留所有权利。
The aim of this study was to investigate the biomechanics and motor co-ordination in humans during stair climbing at different inclinations. Ten normal subjects ascended and descended a five-step staircase at three different inclinations (24degrees, 30degrees, 42degrees). Three steps were instrumented with force sensors and provided 6 dof ground reactions. Kinematics was analysed by a camera-based optoelectronic system. An inverse dynamics approach was applied to compute joint moments and powers. The different kinematic and kinetic patterns of stair ascent and descent were analysed and compared to level walking patterns. Temporal gait cycle parameters and ground reactions were not significantly affected by staircase inclination. Joint angles and moments showed a relatively low but significant dependency on the inclination. A large influence was observed in joint powers. This can be related to the varying amount of potential energy that has to be produced (during ascent) or absorbed (during descent) by the muscles. The kinematics and kinetics of staircase walking differ considerably from level walking. Interestingly, no definite signs could be found indicating that there is an adaptation or shift in the motor patterns when moving from level to stair walking. This can be clearly seen in the foot placement: compared to level walking, the forefoot strikes the ground first-independent from climbing direction and inclination. This and further findings suggest that there is a certain inclination angle or angular range where subjects do switch between a level walking and a stair walking gait pattern. (C) 2002 Elsevier Science B.V. All rights reserved.