...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Biomechanics >Ground reaction forces intersect above the center of mass in single support, but not in double support of human walking
【24h】

Ground reaction forces intersect above the center of mass in single support, but not in double support of human walking

机译：地面反应力在单一载体中以上与肿块中心相交，但不适用于人类行走的双重支持

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

There are various simplifying models that describe balance strategies of human walking. In one model it is assumed that ground reaction forces are directed to a point (virtual pivot point) above the center of mass during the whole stride. This was observed in several experimental investigations, but only for the single support phase. It has not yet been concretely considered whether humans use the same stabilization strategy during the double support phase. For analyzing this, nine volunteers walked at self-selected speed while kinetic and kinematic data were measured. We found that in contrast to the single support phase, where the virtual pivot point was significantly above the center of mass, in the double support phase of human walking the ground reaction forces point around the center of mass with a small spread (R-2 = 92.5%). The different heights of the virtual pivot point in the different support phases could be caused by the vertical movement of the center of mass, which has a lower amplitude in the double support phase. This is also reflected in the ground reaction forces, whereby the ratio of the horizontal and vertical ground reaction forces can explain the height of the virtual pivot point. In the double support phase the ratio is shifted in favor of the horizontal component compared to the single support phase, because of a shorter contact time and a delayed braking impulse. Thus, the whole body seems to rotate around the center of mass, which presumably minimizes required energy. (C) 2021 Elsevier Ltd. All rights reserved.
机译：有各种各样的简化模型来描述人类行走的平衡策略。在一个模型中，假设地面反作用力在整个跨步过程中指向质心上方的一个点（虚拟枢轴点）。在一些实验研究中观察到了这一点，但仅限于单支撑阶段。目前还没有具体考虑人类在双重支持阶段是否使用相同的稳定策略。为了分析这一点，九名志愿者以自选的速度行走，同时测量运动学和运动学数据。我们发现，与单支撑阶段相比，在单支撑阶段，虚拟枢轴点明显高于质心，在人类行走的双支撑阶段，地面反作用力点围绕质心分布较小（R-2=92.5%）。不同支撑阶段虚拟枢轴点的不同高度可能是由质心的垂直运动引起的，在双支撑阶段，质心的振幅较低。这也反映在地面反作用力中，由此水平和垂直地面反作用力的比率可以解释虚拟枢轴点的高度。在双支撑阶段，由于接触时间较短且制动脉冲延迟，与单支撑阶段相比，该比率向有利于水平分量的方向移动。因此，整个身体似乎围绕质心旋转，这可能会使所需能量最小化。（c）2021爱思唯尔有限公司保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号