Moreno F J, Caballero C, Barbado D
Sport Sciences Department, Miguel Hernandez University, Elche, Spain.
Alicante Institute for Health and Biomedical Research (ISABIAL), Alicante, Spain.
J Neurophysiol. 2022 May 1;127(5):1289-1297. doi: 10.1152/jn.00426.2021. Epub 2022 Mar 30.
The complexity of the center of pressure (COP) provides important information regarding the underlying mechanisms of postural control. The relationships between COP complexity and balance performance are not fully established and might depend on the task constraints and the filtering decomposition of the COP signal. This study assessed COP complexity under different task constraints and it was assessed if emergent dynamics of COP fluctuations differ according to fractional components of COP related to peripheral or central adjustments. One hundred and sixty-two participants performed two sitting balance tasks. Accuracy was required by following a target that moved in the mediolateral (ML) or in the anteroposterior (AP) axis. Complexity dynamics of COP were addressed through detrended fluctuation analysis (DFA) in the axis constrained by accuracy requirements and in the one nonconstrained. Decomposition of COP components was applied by low-pass, band-pass, and high-pass filters. DFA of low-pass and band-pass components of COP in the constrained axis were small-to-moderately related ( = 0.190-0.237) to balance performance. DFA of the high-pass component of the COP exhibited the opposite relationship ( = -0.283 to -0.453) in both axes (constrained and nonconstrained). This study evidences that COP complexity is linked to better performance. This positive relationship complexity/performance is observed in the low- and mid-frequency components of the COP. These components might be related to central mechanisms of postural control. The lack of relationships between the different frequencies analyzed in the study suggests that they are capturing different components of postural control. The relationship between the complexity of the center of pressure (COP) and balance performance is not fully established. The task constraints and the filtering decomposition of the COP could influence this relationship. COP complexity is related to a better balance performance only in low frequencies and midfrequencies of the COP. The different frequencies measure different postural control components. Filtering decomposition should be explored in future studies to address the underlying mechanisms of postural control.
压力中心（COP）的复杂性提供了有关姿势控制潜在机制的重要信息。COP复杂性与平衡能力之间的关系尚未完全明确，可能取决于任务限制以及COP信号的滤波分解。本研究评估了不同任务限制下的COP复杂性，并评估了COP波动的涌现动力学是否根据与外周或中枢调整相关的COP分数成分而有所不同。162名参与者进行了两项坐姿平衡任务。要求参与者跟随在内外侧（ML）或前后轴（AP）上移动的目标，以达到准确性。通过在受准确性要求约束的轴和一个不受约束的轴上进行去趋势波动分析（DFA）来研究COP的复杂性动态。通过低通、带通和高通滤波器对COP成分进行分解。在受约束轴上，COP的低通和带通成分的DFA与平衡能力呈小到中度相关（= 0.190 - 0.237）。在两个轴（受约束和不受约束）上，COP高通成分的DFA呈现相反的关系（= -0.283至 -0.453）。本研究表明，COP复杂性与更好的表现相关。这种复杂性/表现的正相关关系在COP的低频和中频成分中可见。这些成分可能与姿势控制的中枢机制有关。研究中分析的不同频率之间缺乏相关性，这表明它们捕捉的是姿势控制的不同成分。压力中心（COP）的复杂性与平衡能力之间的关系尚未完全明确。任务限制和COP的滤波分解可能会影响这种关系。COP复杂性仅在COP的低频和中频与更好的平衡能力相关。不同频率测量的是姿势控制的不同成分。未来的研究应探索滤波分解，以阐明姿势控制的潜在机制。
