Maximum allowable force on a safety harness cable to discriminate a successful from a failed balance recovery
Maximum allowable force on a safety harness cable to discriminate a successful from a failed balance recovery
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DOI：
10.1016/j.jbiomech.2009.04.003
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发表时间：
2009-07-22
影响因子：
2.4
通讯作者：
Smeesters, Cecile
中科院分区：
文献类型：
--
作者：
Cyr, Marc-Andre;Smeesters, Cecile
安全带系统对于确保参与者在平衡恢复阈值实验中的安全至关重要，因为在平衡恢复阈值实验中并不总是可以避免跌倒。本研究的目的是提出一种方法来确定安全带电缆上的最大允许力，以区分成功和失败的平衡恢复。使用了来自12名年轻人的数据，他们参加了实验，以确定参与者可以突然释放的最大前倾角度，并使用三种不同的步数限制恢复平衡。对于每名参与者，通过最小二乘法评估每次试验时安全带电缆上的最大垂直力与初始倾斜角度之间的渐近指数回归系数。五个力常数的最大允许垂直力的拟议阈值确保初始倾斜角相对于其初始值达到其稳态值的99%。因此，它应该很好地区分成功（低于阈值）和失败（高于阈值）的平衡恢复。此外，虽然水平力的幅值在安全带系统设计中不应被忽略，但在平衡恢复阈值的实验中，内外侧力和前后力的贡献可以被忽略。最后，虽然可以使用我们的五个力常数方法，但获得的最大允许垂直力的实际值可能会因其他安全带系统和姿势扰动而异。(C)2009爱思唯尔有限公司保留所有权利。
A safety harness system is essential to ensure participant safety in experiments at the threshold of balance recovery where avoiding a fall is not always possible. The purpose of this study was to propose a method to determine the maximum allowable force on a safety harness cable to discriminate a successful from a failed balance recovery. Data from 12 younger adults, who participated in experiments to determine the maximum forward lean angles that participants could be suddenly released from and still recover balance using three different limits on the number of steps, were used. For each participant, the coefficients of an asymptotic exponential regression, between the maximum vertical force on the safety harness cable and the initial lean angle at each trial, were evaluated by a least squares method. A proposed threshold for the maximum allowable vertical force of five force constants ensured that the initial lean angle reached 99% of its steady state value with respect to its initial value. It should thus discriminate well a successful (below the threshold) from a failed (above the threshold) balance recovery. Furthermore, although the amplitude of the horizontal forces should not be neglected in safety harness system designs, the contributions of the medial-lateral and anterior-posterior forces can be neglected in experiments at the threshold of balance recovery. Finally, although our five force constants method could be used, the actual value obtained for the maximum allowable vertical force may vary with other safety harness systems and postural perturbations. (C) 2009 Elsevier Ltd. All rights reserved.