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Effects of a cognitive dual task on variability and local dynamic stability in sustained repetitive arm movements using principal component analysis: a pilot study

机译：认知双重任务对持续重复性手臂运动中变异性和局部动态稳定性的影响使用主成分分析：一项试点研究

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摘要

In many daily jobs, repetitive arm movements are performed for extended periods of time under continuous cognitive demands. Even highly monotonous tasks exhibit an inherent motor variability and subtle fluctuations in movement stability. Variability and stability are different aspects of system dynamics, whose magnitude may be further affected by a cognitive load. Thus, the aim of the study was to explore and compare the effects of a cognitive dual task on the variability and local dynamic stability in a repetitive bimanual task. Thirteen healthy volunteers performed the repetitive motor task with and without a concurrent cognitive task of counting aloud backwards in multiples of three. Upper-body 3D kinematics were collected and postural reconfigurations—the variability related to the volunteer’s postural change—were determined through a principal component analysis-based procedure. Subsequently, the most salient component was selected for the analysis of (1) cycle-to-cycle spatial and temporal variability, and (2) local dynamic stability as reflected by the largest Lyapunov exponent. Finally, end-point variability was evaluated as a control measure. The dual cognitive task proved to increase the temporal variability and reduce the local dynamic stability, marginally decrease endpoint variability, and substantially lower the incidence of postural reconfigurations. Particularly, the latter effect is considered to be relevant for the prevention of work-related musculoskeletal disorders since reduced variability in sustained repetitive tasks might increase the risk of overuse injuries.
机译：在许多日常工作中，重复的手臂运动会在持续的认知需求下长时间执行。即使是高度单调的任务也表现出固有的运动可变性和运动稳定性的细微波动。可变性和稳定性是系统动力学的不同方面，其大小可能会进一步受到认知负荷的影响。因此，本研究的目的是探索和比较认知双重任务对重复性双向任务中变异性和局部动态稳定性的影响。 13名健康志愿者执行了重复性运动任务，有或没有并发认知任务（以3的倍数向后大声计数）。收集了上身3D运动学，并通过基于主成分分析的程序确定了姿势重新配置（与志愿者的姿势变化有关的变异性）。随后，选择了最显着的成分来分析（1）周期间的空间和时间变异性，以及（2）最大Lyapunov指数所反映的局部动态稳定性。最后，评估端点变异性作为控制措施。双重认知任务证明可增加时间变异性并降低局部动态稳定性，略微降低终点变异性，并显着降低姿势重构的发生率。特别是，后者的作用被认为与预防与工作有关的肌肉骨骼疾病有关，因为持续重复性任务中变异性的降低可能会增加过度使用伤的风险。

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