Approximate entropy detects the effect of a secondary cognitive task on postural control in healthy young adults: a methodological report
Approximate entropy detects the effect of a secondary cognitive task on postural control in healthy young adults: a methodological report
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DOI：
10.1186/1743-0003-4-42
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发表时间：
2007-10-30
影响因子：
5.1
通讯作者：
Stergiou, Nicholas
中科院分区：
文献类型：
--
作者：
Cavanaugh, James T.;Mercer, Vicki S.;Stergiou, Nicholas
背景资料：姿势稳定性的生物力学测量，而一般有用的神经科学和身体康复研究，可能是有限的，在他们的能力，以检测更微妙的影响，注意姿势控制。近似熵（ApEn）是一种来自非线性动力学的规律性统计量，近年来已被证明具有较好的测量精度，并有望用于检测脑震荡后姿势控制的细微变化。我们的目的是进一步探讨的反应性的近似熵，用它来评估的即时，短期的影响，二级认知任务的性能姿势控制在健康，年轻adults.Methods：30名健康，年轻adults进行了修改后的版本的感觉组织测试功能单（姿势只）和双（姿势加认知）任务试验。根据前后（AP）和内外（ML）压力中心（COP）分量时间序列计算ApEn值、均方根（RMS）位移和平衡评分（ES）。对于每个感官条件下，我们比较了姿势控制参数的能力，以检测认知任务performance.Results的影响：COP AP时间序列一般变得更加随机（更高的ApEn值）在双重任务performance.Results，导致认知任务的主要影响（p = 0.004）。与此相反，有没有显着的影响，认知任务的ApEn值COP ML时间序列，RMS位移（AP或ML）或ES。结论：在双重任务的性能，ApEn显示的变化，在各种感官条件下发生的COP振荡的随机性，独立的COP振荡的振幅的变化。这一发现扩大了目前对ApEn检测姿势控制微妙变化的潜力的支持。未来的研究在神经科学和身体康复的注意力的影响进行了讨论。
Background: Biomechanical measures of postural stability, while generally useful in neuroscience and physical rehabilitation research, may be limited in their ability to detect more subtle influences of attention on postural control. Approximate entropy (ApEn), a regularity statistic from nonlinear dynamics, recently has demonstrated relatively good measurement precision and shown promise for detecting subtle change in postural control after cerebral concussion. Our purpose was to further explore the responsiveness of ApEn by using it to evaluate the immediate, short-term effect of secondary cognitive task performance on postural control in healthy, young adults.Methods: Thirty healthy, young adults performed a modified version of the Sensory Organization Test featuring single (posture only) and dual (posture plus cognitive) task trials. ApEn values, root mean square (RMS) displacement, and equilibrium scores (ES) were calculated from anterior-posterior (AP) and medial-lateral (ML) center of pressure (COP) component time series. For each sensory condition, we compared the ability of the postural control parameters to detect an effect of cognitive task performance.Results: COP AP time series generally became more random (higher ApEn value) during dual task performance, resulting in a main effect of cognitive task (p = 0.004). In contrast, there was no significant effect of cognitive task for ApEn values of COP ML time series, RMS displacement (AP or ML) or ES.Conclusion: During dual task performance, ApEn revealed a change in the randomness of COP oscillations that occurred in a variety of sensory conditions, independent of changes in the amplitude of COP oscillations. The finding expands current support for the potential of ApEn to detect subtle changes in postural control. Implications for future studies of attention in neuroscience and physical rehabilitation are discussed.