Department of Rehabilitation Medicine, Center for Rehabilitation, University Medical Center Groningen, Groningen, The Netherlands.
Gait Posture. 2011 Feb;33(2):292-6. doi: 10.1016/j.gaitpost.2010.11.023. Epub 2010 Dec 19.
When negotiating irregular surfaces, the control of dynamic stability is challenged. In this study, we compared the adjustments in stepping behaviour and arm-swing of 18 unilateral transtibial amputees and 17 able-bodied participants when walking on flat and irregular surfaces. Experimental findings revealed that unilateral transtibial amputees reduced their gait velocity only slightly when walking on irregular surfaces. Analyses of the temporal gait characteristics, i.e. stride time, stance time, double-support time and step frequency, showed no statistically significant adjustments. Interestingly, the amputees did not increase the stability margins for lateral balance which were calculated based on the concept of the "extrapolated center of mass". Furthermore, they did not increase their step width, which was already wide when walking on the flat surface. However, amputees did increase the lateral component of relative arm-swing velocity in order to walk stable on irregular surfaces.
在与非规则表面交互时，动态稳定性的控制受到挑战。本研究比较了 18 名单侧胫骨截肢者和 17 名健全参与者在平坦和非规则表面上行走时的步幅行为和手臂摆动调整。实验结果表明，单侧胫骨截肢者在非规则表面上行走时仅略微降低了行走速度。对时间步态特征（即步幅时间、站立时间、双支撑时间和步频）的分析显示，没有统计学上的显著调整。有趣的是，基于“外推质心”概念计算的横向平衡稳定性裕度，截肢者并没有增加。此外，他们并没有增加已经在平坦表面行走时就很宽的步幅。然而，截肢者确实增加了相对手臂摆动速度的横向分量，以在非规则表面上稳定行走。
