楼梯行走足底压力与表面肌电参数研究

Plantar Pressure and Surface EMG Parameters During Stair Walking

目的探究上下楼梯时的足底压力和表面肌电参数,为动力式助行器足部结构设计、动力元件选型和安装位置分布提供理论支撑。方法招募10名健康男性青年进行楼梯行走,利用运动捕捉系统、足底压力系统和表面肌电系统采集足底压力的峰值压强、压力中心轨迹（COP轨迹）和各块下肢肌肉的肌电参数。结果与平地行走相比,楼梯行走时站立相时间占整个步态周期的百分比增大;上楼时前足部分峰值压强增大,下楼时足趾区域的峰值压强减小;楼梯行走时,股直肌、股二头肌、内外侧腓肠肌对人体稳定性起主要作用。结论在设计动力式助行器足部结构时应充分考虑足底压力的分布情况,选择动力式助行器动力元件的安装位置和型号时应考虑主要肌肉的作用。

Objective To explore the plantar pressure and surface electromyography（ s EMG） parameters during human stair walking,so as to provide theoretical support for foot structure design of dynamic walker,selection of power element and distribution of installation location. Methods Ten healthy young males were recruited to perform stair walking trials,respectively. The motion capture system,plantar pressure system and surface myoelectricity acquisition system were used to collect plantar peak pressure,trajectory of COP（ center of pressure） and s EMG parameters of lower limb muscles at the same time. Results Compared with level walking,the percentage of stance time in the whole gait cycle increased during stair walking. The peak pressure of forefoot area increased during stair ascent,while the peak pressure of toe area decreased during stair descent. During stair walking,rectus femoris,biceps femoris,medialis and lateralis gastrocnemius played a main role in maintaining the stability of human body. Conclusions The plantar pressure distribution should be fully considered for foot structure design of dynamic walker and the function of main muscles should be considered for selection of power element and distribution of installation location.