Behavioral effect of knee joint motion on body's center of mass during human quiet standing
Behavioral effect of knee joint motion on body's center of mass during human quiet standing
复制标题
人体安静站立时膝关节运动对身体质心的行为影响
DOI：
10.1016/j.gaitpost.2014.08.016
复制
发表时间：
2015
期刊：
影响因子：
2.4
通讯作者：
Nakazawa K.
中科院分区：
文献类型：
--
作者：
Yamamoto A;Sasagawa S;Oba N;Nakazawa K.
在直立站立过程中的平衡控制机制经常被研究使用单或双连杆倒立摆模型，涉及踝关节或踝关节和髋关节，分别。然而，一些研究报告说，膝关节运动在安静的站立不能被忽视。本研究旨在探讨安静站立时膝关节运动对质心运动学的影响程度。8名健康成年人被要求在力量平台上安静地站立30秒。踝关节、膝关节和髋关节的角位移和加速度由运动捕捉系统获得的运动学数据计算。我们发现角加速度的幅值在踝关节最小，在髋关节最大（踝关节<膝关节<髋关节）。然后将这些角加速度代入有或没有膝关节的三个生物力学模型中，以估计前后方向上的COM加速度。虽然“无膝”模型大大高估了COM加速度，“有膝”模型估计的COM加速度是相似的，从力平台测量获得的实际加速度。这些结果表明，膝关节运动的COM运动学在安静的站立过程中的实质性影响。我们建议，调查的基础上的多关节模型，包括膝关节，需要揭示生理上合理的平衡控制机制，实现中枢神经系统。
The balance control mechanism during upright standing has often been investigated using single- or double-link inverted pendulum models, involving the ankle joint only or both the ankle and hip joints, respectively. Several studies, however, have reported that knee joint motion during quiet standing cannot be ignored. This study aimed to investigate the degree to which knee joint motion contributes to the center of mass (COM) kinematics during quiet standing. Eight healthy adults were asked to stand quietly for 30 s on a force platform. Angular displacements and accelerations of the ankle, knee, and hip joints were calculated from kinematic data obtained by a motion capture system. We found that the amplitude of the angular acceleration was smallest in the ankle joint and largest in the hip joint (ankle < knee < hip). These angular accelerations were then substituted into three biomechanical models with or without the knee joint to estimate COM acceleration in the anterior–posterior direction. Although the “without-knee” models greatly overestimated the COM acceleration, the COM acceleration estimated by the “with-knee” model was similar to the actual acceleration obtained from force platform measurement. These results indicate substantial effects of knee joint motion on the COM kinematics during quiet standing. We suggest that investigations based on the multi-joint model, including the knee joint, are required to reveal the physiologically plausible balance control mechanism implemented by the central nervous system.