期刊名称：International Journal of Clinical and Health Psychology
电子版ISSN：1697-2600
出版年度：2016
卷号：16
期号：3
页码：287-294
DOI：10.1016/j.ijchp.2016.04.002
出版社：Elsevier B.V.
摘要：Abstract Background/Objective: Anxiety symptoms in adolescence have been found to be associated with heart rate variability (HRV) linear features, but more basic properties of the cardiac system remain unexplored. This study focused on the fractal nature of 90 minute-long interbeat fluctuations from 24 adolescents with high anxiety and 26 with low anxiety to (a) evaluate if allometric scaling exponents and linear {HRV} measures allow for distinction between groups, and (b) assess the associations between these measures and sensitivity to punishment (SP), a temperamental characteristic strongly correlated with anxiety. Method: Cardiac functioning was recorded and allometric exponents and vagally mediated {HRV} as indexed by the high frequency (HF) band power were calculated. Results: While the exponents from the high anxiety group were significantly higher than those from low anxiety participants (p < .05), just marginal differences were found for the {HF} measure (p = .057). Furthermore, exponents were positively correlated with {SP} scores and several anxiety scale scores, but no more correlations were found. Conclusions: These results show that beyond parasympathetic functioning, basic properties of the cardiac system may be altered in young, anxious adolescents. These properties, therefore, can provide useful information for assessing adolescents at risk of anxiety disorders.
关键词：Anxiety; Adolescence; Allometric control; Fractality; Ex post facto study; Ansiedad; adolescencia; control alométrico; fractalidad; estudio ex post facto
