Reducing gait speed affects axial coordination of walking turns
Reducing gait speed affects axial coordination of walking turns
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DOI：
10.1016/j.gaitpost.2017.02.020
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发表时间：
2017-05-01
期刊：
影响因子：
2.4
通讯作者：
Franzen, Erika
中科院分区：
文献类型：
--
作者：
Forsell, Caroline;Conradsson, David;Franzen, Erika
车削是日常生活中常见的特征，车身各轴段的动态协调是安全高效车削的基石。虽然步行速度慢是老年和神经系统疾病的共同特征，但人们对步行速度对步行转弯时轴向协调性的影响知之甚少。本研究的目的是探讨步行速度对健康老年人步行转弯中轴向协调性的影响。17名健康的老年成年人随机进行180次左右转弯，同时以自己选择的舒适步速和慢步速度行走。用Wilcoxon符号秩检验法分析转身速度、时空步态参数(步长和步长)、头盆角旋转和角速度、头盆分离(即头盆旋转角度之差)和头盆速度。慢走时，转弯速度比舒适步行慢15%，步长较短，步幅较长。降低行走速度还会导致头部和骨盆轴向旋转的幅度和速度降低，以及头部-骨盆分离和角速度减小。这项研究表明，转弯过程中的轴向协调是速度依赖的，这在健康老年人中减速时表现为更“整体”的运动模式(即轴段之间较少的分离)。这强调了在比较不同步行速度的人群时需要匹配的速度，以区分由于速度引起的变化和由于疾病引起的变化。(C)2017爱思唯尔B.V.保留所有权利。
Turning is a common feature of daily life and dynamic coordination of the axial body segments is a cornerstone for safe and efficient turning. Although slow walking speed is a common trait of old age and neurological disorders, little is known about the effect of walking speed on axial coordination during walking turns. The aim of this study was to investigate the influence of walking speed on axial coordination during walking turns in healthy elderly adults. Seventeen healthy elderly adults randomly performed 180 left and right turns while walking in their self-selected comfortable pace and in a slow pace speed. Turning velocity, spatiotemporal gait parameters (step length and step time), angular rotations and angular velocity of the head and pelvis, head-pelvis separation (i.e. the angular difference in degrees between the rotation of the head and pelvis) and head-pelvis velocity were analyzed using Wilcoxon signed-rank tests. During slow walking, turning velocity was 15% lower accompanied by shorter step length and longer step time compared to comfortable walking. Reducing walking speed also led to a decrease in the amplitude and velocity of the axial rotation of the head and pelvis as well as a reduced head-pelvis separation and angular velocity. This study demonstrates that axial coordination during turning is speed dependent as evidenced by a more 'en bloc' movement pattern (i.e. less separation between axial segments) at reduced speeds in healthy older adults. This emphasizes the need for matching speed when comparing groups with diverse walking speeds to differentiate changes due to speed from changes due to disease. (C) 2017 Elsevier B.V. All rights reserved.