The assessment of stability recovery performance following perturbations contributes to the determination of fall resisting skills. This study investigated the association between stability recovery performances in two perturbation tasks (lean-and-release versus tripping). Healthy adults (12 young: 24 ± 3 years; 21 middle-aged: 53 ± 5 years; 11 old: 72 ± 5 years) were suddenly released from a forward-inclined position attempting to recover stability with a single step. In a second task, all participants experienced a mechanically induced trip during treadmill walking. To assess dynamic stability performance, the antero-posterior margin of stability (MoS), the base of support (BoS), and the rate of increase in BoS were determined at each foot touchdown (TD) for both tasks. Only weak to moderate correlations in dynamic stability performance parameters were found between the two tasks (0.568 > r > 0.305, 0.001 < p < 0.04). A separation of participants according to the number of steps required to regain stability in the lean-and-release task revealed that multiple- (more than one step) compared to single-steppers showed a significantly lower MoS at TD (p = 0.003; g = 1.151), lower BoS at TD (p = 0.019; g = 0.888) and lower rate of increase in BoS until TD (p = 0.002; g = 1.212) after release. Despite these profound subgroup differences in the lean-and-release task, no differences between multiple- and single-steppers were observed in the stability recovery performance during tripping. The results provide evidence that the ability to effectively control dynamic stability following a sudden balance disturbance in adults across a wide age range is limited in its generalisation for different perturbation tasks.

中文翻译：

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增加支撑基础和恢复稳定性的能力在其对不同平衡扰动任务的泛化方面受到限制

扰动后稳定性恢复性能的评估有助于确定抗跌落技能。本研究调查了两个扰动任务（倾斜和释放与跳闸）中稳定性恢复性能之间的关联。健康的成年人（12 名年轻人：24±3 岁；21 名中年人：53±5 岁；11 名老年人：72±5 岁）突然从前倾姿势中释放出来，试图通过一步来恢复稳定性。在第二个任务中，所有参与者在跑步机行走期间都经历了机械诱发的旅行。为了评估动态稳定性性能，确定了两项任务的每次脚触地 (TD) 的前后稳定边界 (MoS)、支撑基础 (BoS) 和 BoS 的增加率。在两个任务之间仅发现动态稳定性性能参数的弱到中等相关性 (0.568 > r > 0.305, 0.001 < p < 0.04)。根据在倾斜和释放任务中恢复稳定性所需的步骤数将参与者分开显示，与单步相比，多步（多于一步）在 TD 显示出显着较低的 MoS（p = 0.003；g = 1.151)，TD 时的 BoS 较低（p = 0.019；g = 0.888），并且释放后 BoS 的增长率较低，直到 TD（p = 0.002；g = 1.212）。尽管在倾斜和释放任务中存在这些显着的亚组差异，但在跳闸期间的稳定性恢复性能方面未观察到多步进器和单步进器之间的差异。