Locomotor stability in able-bodied trunk-flexed gait across uneven ground
Locomotor stability in able-bodied trunk-flexed gait across uneven ground
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DOI：
10.1016/j.humov.2018.10.011
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发表时间：
2018-12-01
影响因子：
2.1
通讯作者：
Blickhan, Reinhard
中科院分区：
文献类型：
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作者：
AminiAghdam, Soran;Mueller, Roy;Blickhan, Reinhard
本研究旨在探讨躯干屈曲步态在不平坦地面上的动态稳定性控制。对于10名年轻的健康参与者，我们比较了前后稳定边缘（MoS）和下肢关节运动学在足部接触过程中，容纳连续的降压和升压（10厘米可见下降）的水平步骤，同时保持四种姿势：规则直立，类似于30度，类似于50度和最大躯干屈曲从垂直。双向重复测量ANOVA显示，对于MoS（p = .187）和有助于MoS计算的参数（p >.05），没有显著的步长x姿势相互作用，而对于髋关节屈曲、髋关节位置（相对于支撑基座的后边界）和膝关节屈曲，发现了显著的相互作用。台阶（p = 0.0001）而非姿势（p = 0.061）对MoS的主要影响是显著的。与水平步进相比，事后测试表明，在步进过程中MoS的幅度下降（p = .011），主要是由于质心位置的进一步向前位移（p = .006）在紧随其后的步进中显着增加（p = 0.002），这是由于支撑基础大幅增加（p = 0.003）。在下台阶和水平台阶中，躯干屈曲步态的髋关节和膝关节屈曲以及髋关节位置没有显著变化（p > 0.05）。在逐步增加，膝关节屈曲增加（除了最大躯干屈曲的步态），而其他运动学变量保持不变。量化的一步一步的动态稳定性的控制扰动步行反映了连续的控制适应通过步态和姿势之间的相互作用。事实上，健全的参与者能够安全地控制身体的CoM的运动与下肢的补偿运动调整和适应的步伐模式相结合。
This study aimed to explore the control of dynamic stability of the imposed trunk-flexed gaits across uneven ground. For ten young healthy participants, we compared the anteroposterior margin of stability (MoS) and lower limb joint kinematics at foot-contact during accommodating a consecutive stepdown and step-up (10-cm visible drop) to that of level steps while maintaining four postures: regular erect, similar to 30 degrees, similar to 50 degrees and maximal trunk flexion from the vertical. Two-way repeated measures ANOVAs revealed no significant step x posture interactions for the MoS (p = .187) and for the parameters that contributed to the MoS calculation (p >.05), whereas significant interactions were found for the hip flexion, hip position (relative to the posterior boundary of the base of support) and the knee flexion. The main effect of step (p = .0001), but not posture (p = .061), on the MoS was significant. Post hoc tests, compared with the level step, showed that the decreased magnitude of the MoS during stepping down (p = .011) mainly due to a further forward displacement of the center of mass position (p = .006) significantly increased in the immediate following step-up (p = .002) as a consequence of a substantial increase in the base of support (p = .003). In the stepdown versus level step, the hip and knee flexions as well as the hip position did not significantly change in the trunk-flexed gaits (p > .05). In the step-up, the knee flexion increased (except for the gaits with the maximum trunk flexion), whereas other kinematic variables remained unchanged. Quantifying the step-to-step control of dynamic stability in a perturbed walking reflected continuous control adaptations through the interaction between gait and posture. In fact, the able-bodied participants were able to safely control the motion of the body's CoM with the combination of compensatory kinematic adjustments in lower-limb and adaptations in stepping pattern.