坡面步行中青年女性下肢关节角及肌肉激活度

Joint angles and muscle activations in the lower limb of young women during slope walking

目的通过定量分析关节角及主要肌肉激活度的变化来说明步行速度和路面坡度对下肢运动的影响。方法首先按由慢到快选择了共5种步行速度,由低到高选择3种坡度,并利用运动捕捉系统对15各青年女性的步态进行测量,同时对影响下肢运动的8块主要肌肉的肌电信号进行了采集。然后通过计算分析获得她们在不同步行速度和路面坡度下髋、膝及踝关节矢状面的关节角度变化的均值,从测量数据中寻找出一个最接近这个均值曲线的研究对象。结果计算获得了该研究对象不同步行速度和路面坡度下踝关节、膝关节及髋关节在一个步态周期内的矢状面关节角的变化曲线以及主要肌肉的激活度变化曲线。结论每个步态周期内,关节角及肌肉激活度在5种不同速度下的变化很小;而在3种不同路面坡度下的变化仅趋势基本一致,峰值的差异却非常明显。

Objective To illustrate the influences of walking speed and road slope on lower limb motions by quan-titative analysis on the changes of joint angles and muscle activation.Method Five walking speeds and three road slopes were selected from slow to fast according to the related measurement.The gaits of 15 young women were measured using the motion capture system and the EMG signals of 8 major muscles in lower limbs were col-lected simultaneously.The mean joint angles of hip,knee and ankle in sagittal plane at different speeds and dif-ferent slopes were calculated.The subject whose data was closest to the mean value could be easily found.Re-sults The joint angles of the subject’s hip,knee and ankle in sagittal plane at different speeds and different slopes in a gait cycle were presented and the activation curves of the 8 major muscles during lower limb move-ments were obtained.Conclusions In each gait cycle,the curves of joint angles and muscle activations varied little with 5 different speeds,while curves for 3 different road slopes only showed similar tendencies but with differ-ent peaks.