Data for graphs (representative values).

Falls in older individuals are a serious health issue in super-aged societies. The stepping reaction is an important postural strategy for preventing falls. This study aimed to reveal the characteristics of lateral stepping in response to mechanical disturbance by means of an analysis of the hip joint kinematics in the stepping leg and head stability during crossover steps. The participants included 11 healthy older and 13 younger individuals. An electromagnet-controlled disturbance-loading device induced crossover steps due to lateral disturbance. Responses were measured using a motion capture system and force plates. The righting reaction of the head was quantified by lateral displacement (sway), neck joint kinematics (angle displacement, angular velocity), and neck joint moment during crossover stepping. Moreover, the relationship between the neck lateral bending moment and angular velocity of hip flexion/adduction of the stepping leg was examined. The lateral head sway was significantly larger in the older participants (1.13±0.7 m/s2) than in the younger individuals (0.54±0.3 m/s2); whereas, the angle displacement (older -14.1±7.1 degree, young -8.3±4.5 degree) and angular velocity (older 9.9±6.6 degree/s, 41.2±27.7 degree/s) of the head were significantly lower in the older than in the younger participants. In both groups, the moment of neck lateral bending exhibited a significant negative correlation with the hip flexion angular velocity of the stepping leg. Correlation analysis also showed a significant negative correlation between the neck lateral bending moment and hip adduction angular velocity only in the older group (r = 0.71, p在超老龄社会中，老年人跌倒是严峻的公共健康问题。迈步反应是预防跌倒的关键姿势策略。本研究旨在通过分析迈步腿的髋关节运动学特征及交叉迈步过程中的头部稳定性，揭示机械扰动诱发侧向迈步的相关特性。本研究共招募11名健康老年人与13名年轻受试者作为研究对象。采用电磁控制的扰动加载装置，通过侧向机械扰动诱发受试者完成交叉迈步动作。通过运动捕捉系统与测力板采集相关响应数据。交叉迈步过程中，通过头部侧向位移（晃动）、颈部关节运动学参数（角度位移、角速度）以及颈部关节力矩，对头部的调整反应进行量化分析。此外，本研究还探讨了颈部侧向弯曲力矩与迈步腿髋关节屈曲/内收角速度之间的关联。研究结果显示，老年受试者的头部侧向晃动幅度（1.13±0.7 m/s²）显著大于年轻受试者（0.54±0.3 m/s²）；而老年受试者的头部角度位移（老年组：-14.1±7.1°，青年组：-8.3±4.5°）与头部角速度（老年组：9.9±6.6°/s，青年组：41.2±27.7°/s）则显著低于年轻受试者。两组受试者的颈部侧向弯曲力矩均与迈步腿髋关节屈曲角速度呈现显著负相关。相关性分析还表明，仅在老年受试者组中，颈部侧向弯曲力矩与髋关节内收角速度存在显著负相关（r = 0.71，p