Allen John J B, Chambers Andrea S, Towers David N
Department of Psychology, University of Arizona, Tucson, AZ 85721-0068, USA.
Biol Psychol. 2007 Feb;74(2):243-62. doi: 10.1016/j.biopsycho.2006.08.005. Epub 2006 Oct 27.
This paper focuses on pragmatic issues in obtaining measures of cardiac vagal control, and overviews a set of freely available software tools for obtaining several widely used metrics that putatively reflect sympathetic and/or parasympathetic contributions to cardiac chronotropy. After an overview of those metrics, and a discussion of potential confounds and extraneous influences, an empirical examination of the relationships amongst these metrics is provided. This study examined 10 metrics in 96 unselected college students under conditions of resting baseline and serial paced arithmetic. Intercorrelations between metrics were very high. Factor analyses were conducted on the metrics reflecting variability in cardiac rate, once at baseline and again during mental arithmetic. Factor structure was highly stable across tasks, and included a factor that had high loadings of all variables except Toichi's "cardiac sympathetic index" (CSI), and a second factor that was defined predominantly by the CSI. Although generally highly correlated, the various metrics responded differently under challenge.
本文聚焦于获取心脏迷走神经控制指标时的实用问题，并概述了一套免费可用的软件工具，用于获取几种广泛使用的指标，这些指标被认为反映了交感神经和/或副交感神经对心率的影响。在概述这些指标并讨论潜在的混杂因素和外部影响之后，对这些指标之间的关系进行了实证研究。本研究在静息基线和连续心算条件下，对96名未经过筛选的大学生的10项指标进行了检测。各指标之间的相互关联度非常高。对反映心率变异性的指标进行了因子分析，一次是在基线时，另一次是在心算期间。因子结构在不同任务中高度稳定，包括一个除了富市的“心脏交感神经指数”（CSI）外所有变量负荷都很高的因子，以及一个主要由CSI定义的第二个因子。尽管各指标通常高度相关，但在受到挑战时它们的反应有所不同。
