Voluntarily changing step length or step width affects dynamic stability of human walking.
Voluntarily changing step length or step width affects dynamic stability of human walking.
复制标题
自愿更改步长或步长会影响人步行的动态稳定性。
DOI：
10.1016/j.gaitpost.2011.11.010
复制
发表时间：
2012-03
期刊：
影响因子：
2.4
通讯作者：
Dingwell, Jonathan B.
中科院分区：
文献类型：
--
作者：
Young, Patricia M. McAndrew;Dingwell, Jonathan B.
步宽（SW）、步长（SL）的变化和/或这些参数的可变性可能与跌倒风险有关。然而，尚不清楚SW和SL的自主变化如何直接改变行走的可变性和/或动态稳定性。在这里，我们量化了当个体自愿操纵SW和SL时，人类行走的可变性和动态稳定性是如何变化的。14名未受损的年轻人在跑步机上以他们喜欢的步行速度行走，步态正常，使用节拍器，比正常更窄，更宽，更短和更长的步伐。采取更窄的步幅导致SL变异性增加，而C7椎体（即躯干）的中外侧（ML）运动局部变得更稳定（p < 0.05）， C7前后（AP）运动局部变得更不稳定（p < 0.05）。更宽的步幅增加了SW和SL的变异性，而ML C7运动在局部和轨道上都变得不稳定（p < 0.05）。任何SL的变化都会增加SW、SL和步幅时间的可变性。当步数较小时，ML C7运动表现出较大的短期局部和眶不稳定性，AP C7运动表现出较低的短期和长期局部不稳定性（p < 0.05）。当步数增加时，AP、ML和C7垂直运动均表现出长期局部不稳定性增加和眼眶不稳定性增加（p < 0.05）。平均SW、SL与C7标记运动的动态稳定性相关性较弱。然而，SW和SL的短期自愿改变确实显著改变了躯干运动的局部和轨道稳定性。
Changes in step width (SW), step length (SL), and/or the variability of these parameters have been prospectively related to risk of falling. However, it is unknown how voluntary changes in SW and SL directly alter variability and/or dynamic stability of walking. Here, we quantified how variability and dynamic stability of human walking changed when individuals voluntarily manipulated SW and SL. Fourteen unimpaired, young adults walked on a treadmill at their preferred walking speed with normal gait, with a metronome and with narrower, wider, shorter and longer steps than normal. Taking narrower steps caused increased SL variability while mediolateral (ML) movements of the C7 vertebra (i.e., trunk) became locally more stable (p < 0.05) and anterior-posterior (AP) C7 movements became locally less stable (p < 0.05). Taking wider steps caused increased SW and SL variability, while ML C7 movements became both locally and orbitally less stable (p < 0.05). Any change in SL caused increased SW, SL, and stride time variability. When taking shorter steps, ML C7 movements exhibited greater short-term local and orbital instability, while AP C7 movements exhibited decreased short-term and long-term local instability (p < 0.05). When taking longer steps, AP, ML, and vertical C7 movements all exhibited increased long-term local instability and increased orbital instability (p < 0.05). Correlations between mean SW, SL and dynamic stability of C7 marker motions were weak. However, short-term voluntary changes in SW and SL did significantly alter local and orbital stability of trunk motions.
登录
查看更多内容
影响因子：
2.4
作者：
Paterson, Kade;Hill, Keith;Lythgo, Noel
通讯作者：
Lythgo, Noel
影响因子：
9.2
作者：
Kuo, AD
通讯作者：
Kuo, AD
影响因子：
2.4
作者：
Donelan, JM;Shipman, DW;Kuo, AD
通讯作者：
Kuo, AD
影响因子：
2.4
作者：
Dingwell, JB;Marin, LC
通讯作者：
Marin, LC
影响因子：
4.6
作者：
Dean, J. C.;Alexander, N. B.;Kuo, A. D.
通讯作者：
Kuo, A. D.