Department of Kinesiology, Texas Christian University, Fort Worth, TX, USA.
Burnett School of Medicine, Texas Christian University, Fort Worth, TX, USA.
J Appl Biomech. 2024 Aug 19;40(5):364-373. doi: 10.1123/jab.2023-0160. Print 2024 Oct 1.
Daily living activities present a diverse array of task and environmental constraints, highlighting the critical role of adapting gait initiation (GI) for an individual's quality of life. This study investigated the effects of GI directions, obstacle negotiation, and leg dominance on anticipatory postural adjustments and stepping kinematics. Fourteen active, young, healthy individuals participated in GI across 4 directions-forward, medial 45°, lateral 45°, and lateral 90°-with variations in obstacle presence and leg dominance. Results revealed a consistent decreasing trend in maximum center of pressure displacement, anticipatory postural adjustment duration, step distance, and swing leg velocity with lateral shifts in GI directions, yet the step duration and swing leg heel trajectory were not affected by GI directions except in lateral 90° GI. Center of pressure displacements were intricately scaled to directional propulsive forces generation, and the stepping kinematics were influenced by the directional modifications in movements. With obstacles, modifications in anticipatory postural adjustment metrics and stepping kinematics reflected the obstacle clearance movements. The dominant leg GI exhibited longer step durations and greater movement variability in medial 45° GI. The current investigation of GI factors expands our existing understanding of GI dynamics and offers valuable insights applicable to fall prevention and gait rehabilitation strategies.
日常生活活动呈现出多样化的任务和环境限制，这凸显了适应步态起始（GI）对于个体生活质量的关键作用。本研究调查了 GI 方向、障碍物穿越和腿优势对预期姿势调整和迈步运动学的影响。14 名活跃、年轻、健康的个体参与了向前、内 45°、外 45°和外 90°四个方向的 GI，同时还考虑了障碍物的存在和腿优势的变化。结果表明，随着 GI 方向的侧向转移，最大的中心压力位移、预期姿势调整持续时间、步幅和摆动腿速度呈现出一致的减小趋势，但步幅持续时间和摆动腿脚跟轨迹不受 GI 方向的影响，除了在侧向 90° GI 时。中心压力位移与定向推进力的产生密切相关，运动的方向改变影响了迈步运动学。有障碍物时，预期姿势调整指标和迈步运动学的改变反映了障碍物清除运动。在 45°内 GI 中，优势腿 GI 表现出更长的步幅持续时间和更大的运动变异性。本研究对 GI 因素的调查扩展了我们对 GI 动力学的现有理解，并为跌倒预防和步态康复策略提供了有价值的见解。
