Department of Physical Therapy and Rehabilitation Science, University of Kansas Medical Center, 3901 Rainbow Boulevard, Mail Stop 2002, Kansas City, KS 66160-7601, USA.
Gait Posture. 2014;39(1):529-33. doi: 10.1016/j.gaitpost.2013.09.002. Epub 2013 Sep 14.
The purpose of this research study was to determine the dynamics of early human response from sudden ankle inversion (30° tilt). Changes in vertical ground reaction forces (GRFs) following trapdoor release in a group of healthy subjects were compared to those from the similar experiments using a chair with two U shaped steel legs and matched weights of the human subjects. The experiments with the chair were further repeated with additional foam paddings at their bases to introduce visco-elastic properties to legs of the chair. Following the trapdoor release a decrease in the vertical ground reaction force under the inverting leg and subsequent increase in the supporting leg were observed in both human and chair experiments. The short onset of changes in vertical GRFs in our experiments indicate that the dynamic features of early response following trapdoor release are primarily due to mechanical events and may not be significantly affected by the neuromuscular reaction of human subjects.
本研究旨在确定人在踝关节突然内翻（30°倾斜）时的早期反应动力学。比较了一组健康受试者在活板门释放后的垂直地面反力（GRF）变化，以及使用带有两个 U 形钢腿和匹配人体受试者重量的椅子进行的类似实验。进一步重复了椅子实验，在其底座上增加了泡沫衬垫，为椅子的腿部引入粘弹性特性。在活板门释放后，我们观察到在翻转腿下的垂直地面反力减小，随后支撑腿的反力增加，在人体和椅子实验中都观察到了这一现象。我们实验中垂直 GRF 变化的短暂出现表明，活板门释放后早期反应的动态特征主要是由于机械事件引起的，而不会受到人体受试者的神经肌肉反应的显著影响。
