Gait modification when decreasing double support percentage
Gait modification when decreasing double support percentage
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DOI：
10.1016/j.jbiomech.2019.05.028
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发表时间：
2019-07-19
影响因子：
2.4
通讯作者：
Martin, Anne E.
中科院分区：
文献类型：
--
作者：
Williams, Daniel S.;Martin, Anne E.
关于行走稳定性，包括步态的哪些方面有助于更高的稳定性，仍有很多未知之处。步行稳定性似乎与步行速度有关，尽管确切的关系尚不清楚。随着步行速度的降低，步态的双支撑（DS）周期在时间上和步态周期的百分比上都增加。由于人类在DS期间对他们的质心运动有更多的控制，因此增加DS持续时间可能会改变稳定性。这项研究探讨了如何通过改变独立于步行速度的DS百分比来影响人类步态。16名年轻健康的成年人在跑步机上以单一速度行走6次，每次1分钟。这些试验包括正常步态以及长于和短于正常DS百分比步态。受试者始终能够降低DS百分比，但难以增加DS百分比。在某些情况下，当改变DS百分比时，受试者改变了他们的节奏，特别是当试图增加DS百分比时。当降低DS百分比时步态的变化与增加步行速度时的变化相似，但主要发生在摆动期间。这些变化包括在摆动期间增加的髋关节和膝关节屈曲，增加的摆动脚高度，以及地面反作用力的更大幅度的峰值。当试图增加DS百分比时步态的变化趋向于降低步行速度时的变化。改变DS百分比诱导的步态变化与步行速度引起的步态变化相似，但明显不同。此外，当以恒定速度行走时增加DS百分比的难度表明，当人们想要增加在DS中花费的时间时，他们走得更慢。(C)2019爱思唯尔有限公司版权所有。
Much is still unknown about walking stability, including which aspects of gait contribute to higher stability. Walking stability appears to be related to walking speed, although the exact relationship is unclear. As walking speed decreases, the double support (DS) period of gait increases both in time and as a percentage of the gait cycle. Because humans have more control over their center of mass movement during DS, increasing DS duration may alter stability. This study examined how human gait is affected by changing DS percentage independent of walking speed. Sixteen young, healthy adults walked on a treadmill at a single speed for six one-minute trials. These trials included normal gait as well as longer- and shorter-than-normal DS percentage gaits. Subjects were consistently able to decrease DS percentage but had difficulty increasing DS percentage. In some cases, subjects altered their cadence when changing DS percentage, particularly when attempting to increase DS percentage. The changes to gait when decreasing DS percentage were similar to changes when increasing walking speed but occurred mainly during the swing period. These changes include increased hip and knee flexion during the swing period, increased swing foot height, and larger magnitude peaks in ground reaction forces. The changes in gait when attempting to increase DS percentage trended toward changes when decreasing walking speed. Altering DS percentage induced gait changes that were similar to, yet clearly distinct from, gait changes due to walking speed. Further, the difficulty of increasing DS percentage when walking at a constant speed suggests that people walk more slowly when they want to increase time spent in DS. (C) 2019 Elsevier Ltd. All rights reserved.