Motoyama Kiyotaka, Tashiro Takehiro, Saito Akira, Horiuchi Masahiro, Sakaki Taisuke, Abe Daijiro
Center for Health and Sports Science, Kyushu Sangyo University, Fukuoka, Japan.
Department of Information Design, Faculty of Design, Nishinippon Institute of Technology, Fukuoka, Japan.
Front Sports Act Living. 2025 Jun 2;7:1602012. doi: 10.3389/fspor.2025.1602012. eCollection 2025.
The time courses of the joint elevation angles of the thigh, shank, and foot in one stride during walking can be well approximated by a "" in a triaxial space. This intersegmental coordination (IC) of the lower limb elevation angles is associated with gait variability. This study aimed to examine how anteroposterior and lateral gait variabilities are influenced by different amplitudes (±0.33 vs. ± 0.67 m·s) and periods (30 vs. 60 s) of sinusoidal speed changes. We also examined which limbs are responsible for the step variabilities.
The IC thickness and coefficient of variance of step width (CV) were quantified as anteroposterior and lateral gait variability in 18 young adults. Time delay of step length (TD) and step frequency (TD) against sinusoidal speed changes were determined. Two-way statistical parametric mapping was applied for the time courses of each limb angle.
The IC thickness was greater in the ±0.67 m·s condition than the ±0.33 m·s condition. Neither periods nor amplitudes affected CV, TD, and TD. In the middle gait cycle, shank and foot angles were delayed against sinusoidal speed changes in the ±0.67 m·s condition during acceleration phase, whereas shank and thigh angles proceeded in that condition during deceleration phase.
Amplitude of sinusoidal speed changes increased anteroposterior, but not lateral, gait variability regardless of period. Distal and proximal limbs are controlled differently when continuous step adjustments are required, and this may be attributed to step variabilities.
在行走过程中，一步内大腿、小腿和足部的关节抬高角度的时间进程在三轴空间中可以很好地用一个“”来近似。下肢抬高角度的这种节段间协调性（IC）与步态变异性有关。本研究旨在探讨正弦速度变化的不同幅度（±0.33与±0.67 m·s）和周期（30与60 s）如何影响前后向和侧向步态变异性。我们还研究了哪些肢体对步幅变异性负责。
在18名年轻成年人中，将IC厚度和步宽变异系数（CV）量化为前后向和侧向步态变异性。确定步长（TD）和步频（TD）相对于正弦速度变化的时间延迟。对每个肢体角度的时间进程应用双向统计参数映射。
±0.67 m·s条件下的IC厚度大于±0.33 m·s条件下的。周期和幅度均未影响CV、TD和TD。在步态周期中期，在±0.67 m·s条件下的加速阶段，小腿和足部角度相对于正弦速度变化延迟，而在减速阶段，小腿和大腿角度在该条件下则提前。
无论周期如何，正弦速度变化的幅度增加了前后向步态变异性，但未增加侧向步态变异性。当需要连续调整步幅时，远端和近端肢体的控制方式不同，这可能归因于步幅变异性。
