Lab of Neural Engineering & Rehabilitation, Department of Biomedical Engineering, College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, China.
Tianjin International Joint Research Center for Neural Engineering, Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China.
Biomed Eng Online. 2018 Sep 21;17(1):127. doi: 10.1186/s12938-018-0558-5.
Turning while walking has a frequent occurrence in daily life. Evaluation of its dynamic stability will facilitate fall prevention and rehabilitation scheme. This knowledge is so limited that we set it as the first aim of this study. Another aim was to investigate spatiotemporal parameters during turning.
Fifteen healthy young adults were instructed to perform straight walking, 45° step turn to the left and 45° spin turn to the right at natural speed. Dynamic stability was measured by margin of stability (MoS) in anterior, posterior, left and right direction at each data point where significant differences were detected using 95% bootstrap confidence band. Common spatiotemporal parameters were computed in each condition subdivided into approach, turn and depart phases.
Results showed that minimum anterior MoS appeared at middle of swing while minimum lateral MoS at contralateral heel strike in all conditions. Posterior MoS decreased before middle of turn phase in spin whereas after middle of turn phase in step. Lateral MoS and stride width declined in turn phase of spin while in depart of step. Spin had a long step and stride length. Long swing phases were observed in turns.
These data help explain that people are most likely to fall forward at middle of swing and to fall toward the back and the support side at heel strike. Our findings demonstrate that instability mainly exist in turn phase of spin and depart phase of step turn.
在日常生活中，边行走边转身是很常见的。评估其动态稳定性有助于预防跌倒和制定康复方案。但目前这方面的知识非常有限，因此我们将其作为本研究的首要目标。本研究的另一个目的是研究转身过程中的时空参数。
15 名健康的年轻人被要求以自然速度进行直线行走、向左转 45°步和向右转 45°旋转。在每个有显著差异的检测点，使用 95%的自举置信带测量动静态稳定度的前后、左右方向的稳定度边界（MoS）。在每个条件下，将常用的时空参数细分为接近、转身和离开三个阶段进行计算。
结果显示，在所有条件下，最小的前向 MoS 出现在摆动的中间，最小的侧向 MoS 出现在对侧脚跟触地时。在旋转的转身阶段中间之前，后向 MoS 减少，而在步转的转身阶段中间之后减少。在旋转的转身阶段，侧向 MoS 和步幅减小，而在步转的离开阶段减小。旋转的步幅较长，转身阶段的摆动阶段较长。
这些数据有助于解释人们最有可能在摆动中间向前跌倒，在脚跟触地时向后和向支撑侧跌倒。我们的研究结果表明，不稳定主要存在于旋转的转身阶段和步转的离开阶段。
