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首页> 外文期刊>Gait & posture >Behavioral effect of knee joint motion on body's center of mass during human quiet standing
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Behavioral effect of knee joint motion on body's center of mass during human quiet standing

机译：人类安静站立时膝盖关节运动对身体质心的行为影响

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摘要

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. (C) 2014 Elsevier B.V. All rights reserved.
机译：经常使用单链接或双链接倒立摆模型研究直立站立期间的平衡控制机制，该模型仅涉及踝关节或分别涉及踝关节和髋关节。但是，有几项研究报告了静坐时膝关节的运动不容忽视。这项研究的目的是调查安静站立时膝盖关节运动对质心（COM）运动的贡献程度。要求八名健康的成年人在测力平台上静静站立30 s。踝关节，膝关节和髋关节的角位移和加速度是根据运动捕捉系统获得的运动数据计算得出的。我们发现角加速度的幅度在踝关节中最小，而在髋关节中最大（踝<膝盖<髋）。然后将这些角加速度替换为三个有或没有膝关节的生物力学模型，以估计前后方向的COM加速度。尽管“无膝”模型大大高估了COM加速度，但“有膝”模型估算的COM加速度与从测力平台测量获得的实际加速度相似。这些结果表明，安静站立时膝关节运动对COM运动学有实质性影响。我们建议需要基于包括膝关节在内的多关节模型进行调查，以揭示中枢神经系统实现的生理上合理的平衡控制机制。 （C）2014 Elsevier B.V.保留所有权利。

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