Walking with increased ankle pushoff decreases hip muscle moments
Walking with increased ankle pushoff decreases hip muscle moments
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DOI：
10.1016/j.jbiomech.2008.05.013
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发表时间：
2008-07-19
影响因子：
2.4
通讯作者：
Ferris, Daniel P.
中科院分区：
文献类型：
--
作者：
Lewis, Cara L.;Ferris, Daniel P.
在一个简单的两足行走模型中，沿着后肢的脉冲推动（类似于踝关节的足底弯曲）或髋关节的扭矩可以实现动力水平的行走。这表明在人类步态中脚踝和臀部肌肉的需求之间存在权衡。患有髋关节前侧疼痛的人可以通过增加踝关节推力来减少髋关节肌肉的力量。我们研究的目的是确定是否通过简单的指令改变踝关节的推力可以改变步态动力学，以及由此导致的踝关节推力的变化是否会影响步态中对臀部肌肉的需求。我们假设踝关节动力学的变化与髋关节肌肉动力学呈负相关。10名健康受试者以1.25米/秒的速度在定制的分带测力跑步机上行走。我们记录了地面反作用力和下肢运动学数据，以计算关节角度和内部肌肉力矩、功率和角脉冲。受试者在三种情况下行走：自然推力、减少推力和增加推力。对于减少推力的情况，受试者被指示走路时用脚减少推力。相反。对于增加的推力条件。受试者被指示用脚推更多的东西。正如预测的那样，增加踝关节推入导致髋屈曲力矩、力量和角冲量峰值降低，髋伸力矩和角冲量峰值降低(p
In a simple bipedal walking model, an impulsive push along the trailing limb (similar to ankle plantar flexion) or a torque at the hip can power level walking. This suggests a tradeoff between ankle and hip muscle requirements during human gait. People with anterior hip pain may benefit from walking with increased ankle pushoff if it reduces hip muscle forces. The purpose of our study was to determine if simple instructions to alter ankle pushoff can modify gait dynamics and if resulting changes in ankle pushoff have an effect on hip muscle requirements during gait. We hypothesized that changes in ankle kinetics would be inversely related to hip muscle kinetics. Ten healthy subjects walked on a custom split-belt force-measuring treadmill at 1.25 m/s. We recorded ground reaction forces and lower extremity kinematic data to calculate joint angles and internal muscle moments, powers and angular impulses. Subjects walked under three conditions: natural pushoff, decreased pushoff and increased pushoff. For the decreased pushoff condition, subjects were instructed to push less with their feet as they walked. Conversely. for the increased pushoff condition. Subjects were instructed to push more with their feet. As predicted, walking with increased ankle pushoff resulted in lower peak hip flexion moment, power and angular impulse as well as lower peak hip extension moment and angular impulse (p