Is There an Optimal Recovery Step Landing Zone Against Slip-Induced Backward Falls During Walking?
Is There an Optimal Recovery Step Landing Zone Against Slip-Induced Backward Falls During Walking?
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DOI：
10.1007/s10439-020-02482-4
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发表时间：
2020-06
影响因子：
3.8
通讯作者：
Bhatt T
中科院分区：
文献类型：
--
作者：
Wang S;Pai YC;Bhatt T
针对前滑的恢复性踏步不仅可以重建支撑基础以防止向后跌倒，还可以提供额外的肢体支撑以防止向下跌倒。因此，在意外滑倒后，通常需要采取恢复步骤来防止跌倒。然而，很少有人知道恢复脚的位置是否会影响滑倒后恢复的可能性。本研究的目的是确定是否有一个最佳的恢复着陆区内的老年人有更高的恢复的可能性。195名参与者在7米长的人行道上行走时经历了一种新奇的、未经宣布的向前滑动。分析了矢状面中的质心（COM）稳定性（根据其位置和速度计算）、垂直肢体支撑（根据髋关节运动学变化计算）和恢复肢体关节力矩（根据关节运动学和地面反作用力）。结果表明，恢复足着地位置与恢复足着地时COM投影位置（相对恢复步位置）的距离越大，有利于稳定性的提高，但不利于肢体支撑的增强;距离越小，则不利于稳定性的提高。相对恢复步位置预测恢复可能性的准确率为67.3%，当恢复足与COM的距离小于0.3 ×足长时，恢复率大于50%。这项研究还发现，更多的后步可能是由于在前摆动阶段踝跖屈肌和髋屈肌力矩不足，而更多的前步是由于在随后的摆动阶段髋和膝伸肌力矩不足。
Recovery stepping in response to forward slips has the potential to not only rebuild the base of support to prevent backward falling, but also provide extra limb support to prevent downward falling. Hence, recovery stepping is often necessary for fall prevention following an unexpected slip. However, less is known about whether recovery foot placement could affect the likelihood of recovery following a slip. The purpose of this study was to determine whether there is an optimal recovery landing zone within which older adults have a higher likelihood of recovery. 195 participants experienced a novel, unannounced forward slip while walking on a 7-meter walkway. The center of mass (COM) stability (computed from its position and velocity), vertical limb support (computed from change in hip kinematics), and recovery limb joint moments (from joint kinematics and ground reaction force) in the sagittal plane were analyzed. The results showed that a longer distance between recovery foot landing position and the projected COM position at recovery foot touchdown (relative recovery step placement) was conducive to stability improvement but adverse to limb support enhancement, and vice versa for a shorter distance. Relative recovery step placement could predict the recovery likelihood with an accuracy of 67.3%, and the recovery rate was greater than 50% when the distance between recovery foot and COM is less than 0.3 × foot length. This study also found more posterior stepping could be attributed to insufficient ankle plantar flexor and hip flexor moments in the pre-swing phase, while more anterior stepping was induced by insufficient hip and knee extensor moments in the following swing phase.
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影响因子：
2
作者：
Bhatt, T;Wening, JD;Pai, YC
通讯作者：
Pai, YC
影响因子：
1.4
作者：
Bhatt T;Pai YC
通讯作者：
Pai YC
影响因子：
3.2
作者：
Maki, BE;McIlroy, WE
通讯作者：
McIlroy, WE
影响因子：
2.5
作者：
Cheung, Vincent C. K.;d'Avella, Andrea;Bizzi, Emilio
通讯作者：
Bizzi, Emilio
影响因子：
3.8
作者：
Gaffney BM;Harris MD;Davidson BS;Stevens-Lapsley JE;Christiansen CL;Shelburne KB
通讯作者：
Shelburne KB