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首页> 外文期刊>Gait & posture >Orbital stability analysis in biomechanics: A systematic review of a nonlinear technique to detect instability of motor tasks
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Orbital stability analysis in biomechanics: A systematic review of a nonlinear technique to detect instability of motor tasks

机译：生物力学中的轨道稳定性分析：检测运动任务不稳定性的非线性技术的系统综述

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摘要

Falls represent a heavy economic and clinical burden on society. The identification of individual chronic characteristics associated with falling is of fundamental importance for the clinicians; in particular, the stability of daily motor tasks is one of the main factors that the clinicians look for during assessment procedures. Various methods for the assessment of stability in human movement are present in literature, and methods coming from stability analysis of nonlinear dynamic systems applied to biomechanics recently showed promise. One of these techniques is orbital stability analysis via Floquet multipliers. This method allows to measure orbital stability of periodic nonlinear dynamic systems and it seems a promising approach for the definition of a reliable motor stability index, taking into account for the whole task cycle dynamics. Despite the premises, its use in the assessment of fall risk has been deemed controversial. The aim of this systematic review was therefore to provide a critical evaluation of the literature on the topic of applications of orbital stability analysis in biomechanics, with particular focus to methodologic aspects. Four electronic databases have been searched for articles relative to the topic; 23 articles were selected for review. Quality of the studies present in literature has been assessed with a customised quality assessment tool. Overall quality of the literature in the field was found to be high. The most critical aspect was found to be the lack of uniformity in the implementation of the analysis to biomechanical time series, particularly in the choice of state space and number of cycles to include in the analysis.
机译：跌倒给社会带来沉重的经济和临床负担。识别与跌倒有关的个体慢性特征对临床医生至关重要。特别是日常运动任务的稳定性是临床医生在评估过程中寻找的主要因素之一。文献中提供了多种评估人体运动稳定性的方法，最近来自应用于生物力学的非线性动力系统的稳定性分析方法也显示出了希望。这些技术之一是通过Floquet乘法器进行轨道稳定性分析。这种方法可以测量周期性非线性动力学系统的轨道稳定性，并且考虑到整个任务周期的动力学特性，这似乎是定义可靠的电机稳定性指标的一种有前途的方法。尽管有前提，但将其用于评估跌倒风险仍被认为是有争议的。因此，本系统综述的目的是对有关轨道稳定性分析在生物力学中的应用这一主题提供重要的文献评估，尤其是方法论方面。已经在四个电子数据库中搜索了有关该主题的文章;选择了23条文章进行审阅。文献中存在的研究质量已通过定制的质量评估工具进行了评估。发现该领域文献的整体质量很高。发现最关键的方面是在对生物力学时间序列进行分析时缺乏统一性，尤其是在选择状态空间和要包括在分析中的循环数方面。

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