Moving from laboratory to real life conditions: Influence on the assessment of variability and stability of gait
Moving from laboratory to real life conditions: Influence on the assessment of variability and stability of gait
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DOI：
10.1016/j.gaitpost.2017.10.024
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发表时间：
2018-01-01
期刊：
影响因子：
2.4
通讯作者：
Mazza, Claudia
中科院分区：
文献类型：
--
作者：
Tamburini, Paola;Storm, Fabio;Mazza, Claudia
可穿戴传感器的可用性允许将步态分析从传统的实验室环境转移到日常生活条件。然而，关于与不同测试环境（例如室内或室外）和行走协议（例如自由或受控）相关的改变是否由测试对象的运动行为的实际差异或对用于评估的指数的这些变化的敏感性引起的知识有限。在这种情况下，假设测试环境和步行协议不会改变年轻健康成年人步态中的运动控制稳定性，这些年轻健康成年人具有成熟和结构化的步态模式，而是他们运动模式的可变性。19名健康青年受试者在不同环境中进行四次行走任务时，躯干和小腿惯性传感器采集数据（室内和室外）以及在受控（即，遵循预定义的直线路径）和自由条件下。结果证实了假设：变异性指标（标准差，变异系数和庞加莱图）显着影响环境和步行条件。稳定性指标（谐波比，短期李雅普诺夫指数，递归量化分析和样本熵），相反，并没有突出任何变化的电机controlling.In结论，这项研究强调了环境和测试条件的影响评估的具体特征的步态（即变异性和稳定性）。特别是，对于年轻健康的成年人，环境和测试条件影响步态变异性指标，而既不影响步态稳定性指标。
The availability of wearable sensors allows shifting gait analysis from the traditional laboratory settings, to daily life conditions. However, limited knowledge is available about whether alterations associated to different testing environment (e.g. indoor or outdoor) and walking protocols (e.g. free or controlled), result from actual differences in the motor behaviour of the tested subjects or from the sensitivity to these changes of the indexes adopted for the assessment. In this context, it was hypothesized that testing environment and walking protocols would not modify motor control stability in the gait of young healthy adults, who have a mature and structured gait pattern, but rather the variability of their motor pattern.To test this hypothesis, data from trunk and shank inertial sensors were collected from 19 young healthy participants during four walking tasks in different environments (indoor and outdoor) and in both controlled (i.e. following a predefined straight path) and free conditions. Results confirmed what hypothesized: variability indexes (Standard deviation, Coefficient of variation and Poincare plots) were significantly influenced by both environment and walking conditions. Stability indexes (Harmonic ratio, Short term Lyapunov exponents, Recurrence quantification analysis and Sample entropy), on the contrary, did not highlight any change in the motor control.In conclusion, this study highlighted an influence of environment and testing condition on the assessment of specific characteristics of gait (i.e. variability and stability). In particular, for young healthy adults, both environment and testing conditions affect gait variability indexes, whereas neither affect gait stability indexes.