Magnitude and variability of gait characteristics when walking on an irregular surface at different speeds
Magnitude and variability of gait characteristics when walking on an irregular surface at different speeds
复制标题
DOI：
10.1016/j.humov.2018.04.003
复制
发表时间：
2018-06-01
影响因子：
2.1
通讯作者：
Sterzing, Thorsten
中科院分区：
文献类型：
--
作者：
Blair, Stephanie;Lake, Mark J.;Sterzing, Thorsten
不同的扰动模式已被用来了解个体如何通过不规则表面，一般认为运动变异性的增加会诱导积极的训练刺激。当最初暴露于这种运动任务时，个体倾向于走得更慢，可能影响生物力学参数的大小和变化。本文研究了在不规则和规则表面上行走时，步态速度对下肢生物力学的影响。20名身体活跃的男性以三种不同的速度（4公里/小时，5公里/小时，6公里/小时）在RS和IS上行走。下肢运动学（300赫兹）和表面肌电图（3000赫兹）记录在第一个90秒的步态。双因素重复测量ANOVA用于确定表面和速度效应（p < 0.05）。步态速度影响步行生物力学（运动学和肌肉活动参数）相同，无论表面条件。随着步行速度的增加，在IS和RS上行走时，站立相的矢状鞋面角、最大踝关节内翻、踝关节外展、膝关节和髋关节屈曲均增加（p < 0.05）。在步态周期中，增加步行速度导致IS和RS上的胫骨前肌、腓骨长肌、腓肠肌内侧肌、股内侧肌和股二头肌的肌肉活动增加（p < 0.05）。在IS和RS上，在较低的步行速度下报告了步态、运动学和肌肉活动变异性增加。此外，与步态速度无关，与RS行走相比，在IS上行走触发姿势调整、更高的肌肉活动和增加的步态可变性。我们的研究结果表明，在不规则表面上训练的好处可能会在较慢的步态速度下进一步增强。
Different modes of perturbations have been used to understand how individuals negotiate irregular surfaces, with a general notion that increased locomotion variability induces a positive training stimulus. Individuals tend to walk slower when initially exposed to such locomotion tasks, potentially influencing the magnitude and variability of biomechanical parameters. This study investigated theeffects of gait speed on lower extremity biomechanics when walking on an irregular (IS) and regular surface (RS). Twenty physically active males walked on a RS and IS at three different speeds (4 km/h, 5 km/h, 6 km/h). Lower extremity kinematics (300 Hz) and surface electromyography (3000 Hz) were recorded during the first 90 s of gait. Two-factor repeated measures ANOVA was used to determine surface and speed effects (p < 0.05). Gait speed influences walking biomechanics (kinematic and muscle activity parameters) the same irrespective of surface condition. As walking speed increased, sagittal shoe-surface angle, maximum ankle inversion, ankle abduction, knee and hip flexion increased during stance phase when walking on the IS and RS (p < 0.05). Increasing walking speed caused increased muscle activity of the tibialis anterior, peroneus longus, gastrocnemius medialis, vastus medialis and biceps femoris (p < 0.05) on the IS and RS during the gait cycle. Increased gait, kinematic and muscle activity variability was reported at lower walking speed on both the IS and RS. Further, irrespective of gait speed, walking on an IS triggers postural adjustments, higher muscle activity and increased gait variability compared to RS walking. Our findings suggest the benefits of training on the irregular surface may be further enhanced at slower gait speeds.