Comparison of acceleration signals of simulated and real-world backward falls
Comparison of acceleration signals of simulated and real-world backward falls
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DOI：
10.1016/j.medengphy.2010.11.003
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发表时间：
2011-04-01
影响因子：
2.2
通讯作者：
Lindemann, U.
中科院分区：
文献类型：
--
作者：
Klenk, J.;Becker, C.;Lindemann, U.
大多数关于老年人跌倒的知识都是从口头报告中获得的，这些报告在许多方面可能存在偏见。跌倒模拟被广泛用于深入了解跌倒情况，但结果（至少在跌倒检测方面）并不令人信服。将 4 名老年人（平均年龄 68.8 岁）5 次真实向后跌倒的加速度和最大冲击力的变化与 18 名健康学生模拟向后跌倒的相应信号进行比较。在实验1中，学生们被要求“像一个虚弱的老人一样向后摔倒”。在实验2中，学生们被要求在从后倾状态中释放出来时，如果可能的话不要跌倒。使用三轴加速度传感器进行数据采集。在实验 1 中，与跌倒模拟相比，真实跌倒中的加速度信号变化明显更大，并且最大冲击力更高。相反，与实验 2 中的真实跌倒相比，跌倒模拟的所有加速度和冲击力值都较高。目前的研究结果证明了真实跌倒和跌倒模拟之间的差异。如果使用跌倒模拟，则应注意其局限性，并且应调整协议以更好地匹配现实世界的跌倒。 (C) 2010 年 IPEM。由爱思唯尔有限公司出版。保留所有权利。
Most of the knowledge on falls of older persons has been obtained from oral reports that might be biased in many ways. Fall simulations are widely used to gain insight into circumstances of falls, but the results, at least concerning fall detection, are not convincing. Variation of acceleration and maximum jerk of 5 real-world backward falls of 4 older persons (mean age 68.8 years) were compared to the corresponding signals of simulated backward falls by 18 healthy students. Students were instructed to "fall to the back as if you were a frail old person" during experiment 1. In experiment 2, students were instructed not to fall, if possible, when released from a backward lean. Data acquisition was performed using a tri-axial acceleration sensor. In experiment 1, there was significantly more variation within the acceleration signals and maximum jerk was higher in the real-world falls, compared to the fall simulation. Conversely, all values of acceleration and jerk were higher for the fall simulations, compared to real-world falls in experiment 2.The present findings demonstrate differences between real-world falls and fall simulations. If fall simulations are used, their limitations should be noted and the protocol should be adapted to better match real-world falls. (C) 2010 IPEM. Published by Elsevier Ltd. All rights reserved.