Resonant frequencies of arms and legs identify different walking patterns
Resonant frequencies of arms and legs identify different walking patterns
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DOI：
10.1016/s0021-9290(00)00020-8
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发表时间：
2000-07-01
影响因子：
2.4
通讯作者：
Van Emmerik, REA
中科院分区：
文献类型：
--
作者：
Wagenaar, RC;Van Emmerik, REA
本研究旨在调查年轻健康受试者手臂和腿部运动协调性的变化。据推测，随着步行速度的变化，手臂和腿之间的频率和相位耦合也会发生变化。此外，还假设可以通过简单的摆模型根据手臂和腿部的共振频率来预测不同协调模式的首选频率。使用矢状面加速度计以各种不同速度（即 0.3-1.3 m/s）记录七名健康受试者在跑步机上行走时手臂和腿部的运动学。功率谱分析显示，al-ms 和腿部之间的频率关系存在统计上显着的变化，即，在 0.3-0.7 m/s 的速度范围内，手臂运动频率主要与步频同步，而从 0.8 m/s 开始，手臂频率被锁定到步幅频率。研究发现步行速度对腿部和手臂运动之间的平均相对相位有显着影响。从 0.8 到 1.0 m/s 起，所有肢体对都显示出明显更稳定的协调模式。摆模型的结果表明，对于大多数受试者来说，低速时手臂的首选运动频率是通过各个手臂的共振频率（约 0.98 Hz）来预测的，而在较高速度时，这些手臂的首选运动频率是根据各个腿的共振频率（约 0.85 Hz）来预测的。结果支持上述假设，并表明人类步行模式中可能存在不同的协调模式，如频率耦合和相位关系的变化所示。 (C) 2000 Elsevier Science Ltd. 保留所有权利。
The present study is aimed at investigating changes in the coordination of arm and leg movements in young healthy subjects. It was hypothesized that with changes in walking Velocity there is a change in frequency and phase coupling between the arms and the legs. In addition, it was hypothesized that the preferred frequencies of the different coordination patterns can be predicted on the basis of the resonant frequencies of arms and legs with a simple pendulum model. The kinematics of arms and Legs during treadmill walking in seven healthy subjects were recorded with accelerometers in the sagittal plane at a wide range of different velocities (i.e., 0.3-1.3 m/s). Power spectral analyses revealed a statistically significant change in the frequency relation between al-ms and legs, i.e., within the velocity range 0.3-0.7 m/s arm movement frequencies were dominantly synchronized with the step Frequency, whereas from 0.8 m/s onwards arm frequencies were locked onto stride frequency. Significant effects of walking speed on mean relative phase between leg and arm movements were found. All limb pairs showed a significantly more stable coordination pattern from 0.8 to 1.0 m/s onwards. Results from the pendulum modelling demonstrated that for most subjects at low-velocity preferred movement frequencies of the arms are predicted by the resonant frequencies of individual arms (about 0.98 Hz), whereas at higher velocities these are predicted on the basis of the resonant frequencies of the individual legs (about 0.85 Hz). The results support the above-mentioned hypotheses, and suggest that different patterns of coordination, as shown by changes in frequency coupling and phase relations, can exist within the human walking mode. (C) 2000 Elsevier Science Ltd. All rights reserved.