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首页> 外文期刊>Gait & posture >Spatiotemporal characteristics of the walk-to-run and run-to-walk transition when gradually changing speed.
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Spatiotemporal characteristics of the walk-to-run and run-to-walk transition when gradually changing speed.

机译：逐渐改变速度时，步行和步行过渡的时空特征。

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摘要

The purpose of this study was to examine spatiotemporal parameters of the walk-to-run transition (WRT) and run-to-walk transition (RWT) when speed is altered with different constant accelerations. Twenty women (height: 168.9+/-3.36cm) performed three accelerations (0.05, 0.07 and 0.1ms(-2)) and three decelerations (-0.05, -0.07 and -0.1ms(-2)) on a motor-driven treadmill. The transition step in the WRT (first step with a flight phase) and RWT (first step with a double stance phase) occurred at the same speed for all accelerations but these did not occur in the same way. The most striking difference was the presence of a transition step with specific spatiotemporal characteristics in the WRT, whereas this was not observed in the RWT. The transition is not a sudden one-step-event. WRT occurred before transition and consisted of a "pre-transition period" and the transition step whereas RWT occurred after transition and consisted of the transition step and a "post-transition period". Both transition periods were characterized by an exponential evolution of step frequency and step length. Step frequency and step length showed a linear evolution before and after transition. The flight phase of the transition step in the WRT reached a minimum with comparable duration of the last flight phase in the RWT. The flight phase could be considered as an intrinsic dynamical factor of transition. Further research in kinematics, the trajectory of the body centre of mass and energy fluctuations will give more insight in these transitions.
机译：这项研究的目的是检查当以不同的恒定加速度改变速度时，步行到跑步过渡（WRT）和跑步到步行过渡（RWT）的时空参数。二十名女性（身高：168.9 +/- 3.36cm）在电机驱动下进行了三个加速（0.05、0.07和0.1ms（-2））和三个减速（-0.05，-0.07和-0.1ms（-2））跑步机。对于所有加速度，WRT（具有飞行阶段的第一步）和RWT（具有双姿态阶段的第一步）中的过渡步骤均以相同的速度发生，但并非以相同的方式发生。最显着的差异是WRT中存在具有特定时空特征的过渡步骤，而RWT中未观察到这一点。过渡不是突然的一站式事件。 WRT发生在过渡之前，由“过渡前时期”和过渡步骤组成，而RWT发生在过渡之后，由过渡步骤和“过渡后时期”组成。两个过渡期的特征都是步频和步长的指数变化。步频和步长在过渡前后均呈线性变化。 WRT中过渡步骤的飞行阶段达到了最小，RWT中最后一个飞行阶段的持续时间相当。飞行阶段可以被视为过渡的内在动力因素。运动学的进一步研究，身体重心的轨迹和能量波动将为这些转变提供更多的见识。

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