Bornas Xavier, Llabrés Jordi, Morillas-Romero Alfonso, Aguayo-Siquier Blanca, Balle Maria, Tortella-Feliu Miquel
University of Balearic Islands, Mallorca, Spain.
Nonlinear Dynamics Psychol Life Sci. 2013 Jul;17(3):345-60.
Effective regulation of emotions requires the ability to voluntarily manage attention, i.e. attentional control (AC), which has been related to heart rate variability and vagal tone in laboratory based research. In this study, we calculated the correlation dimension (CD), the fractal-like properties (scaling exponents ?1 and ?2, and fractal dimension) and the sample entropy of heart rate time series obtained from ECG recordings (4 hours long each) taken from a sample of healthy students (n=47) during everyday activities. AC was assessed through a self-reported questionnaire. As expected, a linear positive correlation was found between AC scores and CD and entropy, but no associations were found between AC and ?1 and fractal dimension. The association between AC and ?2 was negative and marginally significant. No associations were found between AC and linear heart rate variability measures. These results show that nonlinear measures of long, everyday life, heart rate time series may provide useful information about the AC ability of healthy students.
有效的情绪调节需要具备自主管理注意力的能力，即注意力控制（AC），在基于实验室的研究中，这一能力与心率变异性和迷走神经张力有关。在本研究中，我们计算了从健康学生样本（n = 47）日常活动期间采集的心电图记录（每次时长4小时）中获得的心率时间序列的关联维数（CD）、类分形属性（标度指数α1和α2以及分形维数）和样本熵。通过一份自我报告问卷对注意力控制进行评估。正如预期的那样，在注意力控制得分与关联维数和熵之间发现了线性正相关，但在注意力控制与α1和分形维数之间未发现关联。注意力控制与α2之间的关联为负且具有边缘显著性。在注意力控制与线性心率变异性测量之间未发现关联。这些结果表明，长时间日常生活中心率时间序列的非线性测量可能为健康学生的注意力控制能力提供有用信息。
