Reciprocal angular acceleration of the ankle and hip joints during quiet standing in humans
Reciprocal angular acceleration of the ankle and hip joints during quiet standing in humans
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DOI：
10.1007/s002210000603
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发表时间：
2001-02-01
影响因子：
2
通讯作者：
Yano, H
中科院分区：
文献类型：
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作者：
Aramaki, Y;Nozaki, D;Yano, H
人类安静的站立状态通常被模拟为一个围绕脚踝关节旋转的倒立摆，假设髋关节周围的运动非常小。然而，最近的几项研究表明，髋关节周围的运动在有效维持支撑区域上方的身体质量中心(COM)方面发挥着重要作用。这项研究的目的是调查在人类安静站立时髋关节和踝关节之间的协调性是如何控制的。受试者静静地站着看着S，眼睛睁着(EO)或闭着(EC)，我们用三个高灵敏度的CCD光位移传感器测量了脚踝(A)和髋关节(H)关节周围的细微角位移。获得了可靠的角位移和角速度(角位移的一阶导数)数据。此外，测量误差并不明显，即使在通过取角位移的二阶导数获得的角加速度数据中也是如此。髋关节的角位移、速度和加速度明显大于对照组(P
Human quiet standing is often modeled as a single inverted pendulum rotating around the ankle joint, under the assumption that movement around the hip joint is quite small. However, several recent studies have shown that movement around the hip joint can play a significant role in the efficient maintenance of the center of body mass (COM) above the support area. The aim of this study was to investigate how coordination between the hip and ankle joints is controlled during human quiet standing. Subjects stood quietly for 30 s with their eyes either opened (EO) or closed (EC), and we measured subtle angular displacements around the ankle (theta (a)) and hip (theta (h)) joints using three highly sensitive CCD laser displacement sensors. Reliable data were obtained for both angular displacement and angular velocity (the first derivative of the angular displacement). Further, measurement error was not predominant, even among the angular acceleration data, which were obtained by taking the second derivative of the angular displacement. The angular displacement, velocity, and acceleration of the hip were found to be significantly greater (P