近似熵检测次要认知任务对健康年轻成年人姿势控制的影响：一项方法学报告。
Approximate entropy detects the effect of a secondary cognitive task on postural control in healthy young adults: a methodological report.
作者信息
Cavanaugh James T, Mercer Vicki S, Stergiou Nicholas
机构信息
Department of Physical Therapy, University of New England, Portland, ME, USA.
出版信息
J Neuroeng Rehabil. 2007 Oct 30;4:42. doi: 10.1186/1743-0003-4-42.
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.
背景
姿势稳定性的生物力学测量方法虽然在神经科学和物理康复研究中普遍有用，但在检测注意力对姿势控制的更细微影响方面，其能力可能有限。近似熵（ApEn）是一种来自非线性动力学的规律性统计量，最近已显示出相对较好的测量精度，并有望检测脑震荡后姿势控制的细微变化。我们的目的是通过使用近似熵来评估次要认知任务表现对健康年轻成年人姿势控制的即时、短期影响，从而进一步探索其反应性。
方法
30名健康的年轻成年人进行了改良版的感觉统合测试，包括单任务（仅姿势）和双任务（姿势加认知）试验。从前-后（AP）和中-侧（ML）压力中心（COP）分量时间序列计算近似熵值、均方根（RMS）位移和平衡分数（ES）。对于每种感觉条件，我们比较了姿势控制参数检测认知任务表现影响的能力。
结果
在双任务执行期间，COP AP时间序列通常变得更加随机（近似熵值更高），导致认知任务的主效应（p = 0.004）。相比之下，认知任务对COP ML时间序列的近似熵值、RMS位移（AP或ML）或ES没有显著影响。
结论
在双任务执行期间，近似熵揭示了在各种感觉条件下发生的COP振荡随机性的变化，与COP振荡幅度的变化无关。这一发现扩展了目前对近似熵检测姿势控制细微变化潜力的支持。讨论了对神经科学和物理康复中未来注意力研究的意义。
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