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首页> 外文期刊>Entropy >The Effect of Cognitive Resource Competition Due to Dual-Tasking on the Irregularity and Control of Postural Movement Components
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The Effect of Cognitive Resource Competition Due to Dual-Tasking on the Irregularity and Control of Postural Movement Components

机译：双重任务引起的认知资源竞争对姿势运动成分的不规则性和控制的影响

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Postural control research suggests a non-linear, n-shaped relationship between dual-tasking and postural stability. Nevertheless, the extent of this relationship remains unclear. Since kinematic principal component analysis has offered novel approaches to study the control of movement components (PM) and n-shapes have been found in measures of sway irregularity, we hypothesized (H1) that the irregularity of PMs and their respective control, and the control tightness will display the n-shape. Furthermore, according to the minimal intervention principle (H2) different PMs should be affected differently. Finally, (H3) we expected stronger dual-tasking effects in the older population, due to limited cognitive resources. We measured the kinematics of forty-one healthy volunteers (23 aged 26 ± 3; 18 aged 59 ± 4) performing 80 s tandem stances in five conditions (single-task and auditory n-back task; n = 1–4), and computed sample entropies on PM time-series and two novel measures of control tightness. In the PM most critical for stability, the control tightness decreased steadily, and in contrast to H3, decreased further for the younger group. Nevertheless, we found n-shapes in most variables with differing magnitudes, supporting H1 and H2. These results suggest that the control tightness might deteriorate steadily with increased cognitive load in critical movements despite the otherwise eminent n-shaped relationship.
机译：姿势控制研究表明，双重任务和姿势稳定性之间存在非线性，n形关系。然而，这种关系的程度尚不清楚。由于运动学主成分分析提供了新颖的方法来研究运动成分（PM）的控制，并且已经在摇摆不规则性的度量中找到了n形，因此我们假设（H1）PM的不规则性及其各自的控制和控制紧密度将显示n形。此外，根据最小干预原则（H2），不同的PM应受到不同的影响。最后，（H3）由于认知资源有限，我们预计老年人口的双重任务作用会更强。我们测量了在五个条件下（单项任务和听觉n-向后任务; n = 1-4）执行80 s串联姿势的41名健康志愿者的运动学（23岁26±3; 18岁59±4），并且计算PM时间序列上的样本熵和控制紧密度的两种新方法。在对稳定性最关键的PM中，控制紧度稳步下降，与H3相比，年轻组进一步下降。尽管如此，我们发现大多数变量具有不同大小的n形，支持H1和H2。这些结果表明，尽管存在其他显着的n形关系，但随着关键动作中认知负荷的增加，控制松紧度可能会稳定下降。

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