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首页> 外文期刊>Journal of Biomechanics >Ground reaction forces and impulses during a transient turning maneuver.
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Ground reaction forces and impulses during a transient turning maneuver.

机译：瞬态转向操作期间的地面反作用力和脉冲。

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Understanding the kinetic strategies of turning as expressed in ground reaction forces (GRFs) and impulses (GRIs) is necessary to design therapies and technologies to enable patients with ambulatory difficulties perform daily activities. Previous studies have reported data only for one step of the turn and expressed the data in terms of a global reference frame making it difficult to understand how the forces act on the body to cause a change in heading and orientation during a turn. This study is the first to report GRF and GRI data for three steps of a turn and express that data in terms of a body reference frame. Motion and GRF data were collected from 10 subjects walking at self-selected speeds along a straight path and performing 90 degrees left and right turns. During the left turn, turn initiation and apex steps were collected. During the right turn, turn termination steps were collected. GRF data were rotated to a reference frame whose origin was the body center of mass (COM) and aligned to theCOM trajectory and then integrated to find the GRIs. In the medial-lateral direction, straight steps were characterized by a brief medial impulse at heel strike followed by a prolonged lateral impulse. Turn initiation and termination steps were both characterized by medial impulses spanning the entire stance phase while apex steps were characterized by a large lateral impulse. In the anterior-posterior direction, initiation steps had larger braking and smaller propulsive impulses than straight steps. Apex steps had larger propulsive impulses than straight steps, and termination steps had smaller braking and larger propulsive impulses than straight steps.
机译：了解以地面反作用力（GRF）和冲动（GRI）表示的转弯动力学策略，对于设计疗法和技术以使患有门诊困难的患者能够进行日常活动非常必要。先前的研究仅报告了转弯一步的数据，并以全局参考框架表示了数据，这使得难以理解力在转弯过程中如何作用于身体，从而导致航向和方向发生变化。这项研究是第一个报告三个步骤的GRF和GRI数据并以身体参照系表达该数据的研究。运动和GRF数据是从10名受试者中收集的，这些受试者以自行选择的速度沿着一条直线路径行走，并左右旋转90度。在左转弯期间，收集转弯起始和顶点步骤。在右转期间，收集了转弯终止步骤。将GRF数据旋转到原点为身体重心（COM）的参考框架，并与COM轨迹对齐，然后进行积分以找到GRI。在内侧-外侧方向上，笔直的步伐的特征是脚跟撞击时有短暂的内侧脉冲，然后是长时间的外侧脉冲。转弯的起始和终止步骤均以跨越整个姿态阶段的内侧脉冲为特征，而顶点的步骤则以较大的横向脉冲为特征。在前后方向上，启动步骤比直线步骤具有更大的制动力和较小的推进力。顶点踏板比直线踏板具有更大的推进脉冲，而终止踏板比直线踏板具有更小的制动和更大的推进脉冲。

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