Effects of walking speed on asymmetry and bilateral coordination of gait.
Effects of walking speed on asymmetry and bilateral coordination of gait.
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DOI：
10.1016/j.gaitpost.2013.04.011
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发表时间：
2013-09
期刊：
影响因子：
2.4
通讯作者：
Hausdorff, Jeffery M.
中科院分区：
文献类型：
--
作者：
Plotnik, Meir;Bartsch, Ronny P.;Zeev, Aviva;Giladi, Nir;Hausdorff, Jeffery M.
调节人类步态双侧协调的机制在很大程度上是未知的。我们的目的是研究如何双边协调的变化，在地面行走的步态速度修改的结果。15名年轻人穿着力敏鞋垫，该鞋垫测量用于确定三种步行条件下步态周期事件的定时的垂直力（即，通常-步行，快和慢）。地面反作用力的影响（GRFI）与脚跟罢工也被量化，代表的潜在贡献的感觉反馈的步态调节。步态不对称性（GA）的基础上量化的差异，左右摆动时间和步态的双边协调进行了评估，使用相位协调指数（PCI），量化的一致性和准确性的反相步进模式的度量。GA在三种不同的步态速度下均得以保存。与正常行走相比，缓慢步态条件下的PCI更高（协调性降低）（分别为3.51%和2.47%，p=0.002），但在快速条件下未受到显著影响。GRFI值在慢速步行中低于正常步行，而在快速步行条件下高于正常步行（p<0.001）。逐步回归分析显示，PCI中步态相关变化的减缓与GRFI中步态相关变化的减缓无关。目前的研究结果表明，左右反相步进是相似的，在正常和快速行走，但改变在缓慢行走。这种行为可能反映了调节缓慢步态速度所需的注意力资源的相对增加，这与皮质功能和脊髓上输入影响步态的双侧协调的可能性一致。
The mechanisms regulating the bilateral coordination of gait in humans are largely unknown. Our objective was to study how bilateral coordination changes as a result of gait speed modifications during over ground walking. 15 young adults wore force sensitive insoles that measured vertical forces used to determine the timing of the gait cycle events under three walking conditions (i.e., usual-walking, fast and slow). Ground reaction force impact (GRFI) associated with heel-strikes was also quantified, representing the potential contribution of sensory feedback to the regulation of gait. Gait asymmetry (GA) was quantified based on the differences between right and left swing times and the bilateral coordination of gait was assessed using the phase coordination index (PCI), a metric that quantifies the consistency and accuracy of the anti-phase stepping pattern. GA was preserved in the three different gait speeds. PCI was higher (reduced coordination) in the slow gait condition, compared to usual-walking (3.51% vs. 2.47%, respectively, p=0.002), but was not significantly affected in the fast condition. GRFI values were lower in the slow walking as compared to usual-walking and higher in the fast walking condition (p<0.001). Stepwise regression revealed that slowed gait related changes in PCI were not associated with the slowed gait related changes in GRFI. The present findings suggest that left-right anti-phase stepping is similar in normal and fast walking, but altered during slowed walking. This behavior might reflect a relative increase in attention resources required to regulate a slow gait speed, consistent with the possibility that cortical function and supraspinal input influences the bilateral coordination of gait.
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