Heart rate complexity: A novel approach to assessing cardiac stress reactivity: Cardiac stress reactivity and heart rate complexity

Research output: Contribution to journalArticle

Colleges, School and Institutes

External organisations

  • School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, England, UK
  • Department of Psychiatry; School of Medicine, University of Pittsburgh; Pittsburgh Pennsylvania USA
  • Department of Psychiatry; School of Medicine, University of Pittsburgh; Pittsburgh Pennsylvania USA

Abstract

Correlation dimension (D2), a measure of heart rate (HR) complexity, has been shown to decrease in response to acute mental stress and relate to adverse cardiovascular health. However, the relationship between stress‐induced changes in D2 and HR has yet to be established. The present studies aimed to assess this relationship systematically while controlling for changes in respiration and autonomic activity. In Study 1 (N = 25) D2 decreased during stress and predicted HR reactivity even after adjusting for changes in respiration rate, and cardiac vagal tone. This result was replicated in Study 2 (N = 162) and extended by including a measure of cardiac sympathetic activity; correlation dimension remained an independent predictor of HR reactivity in a hierarchical linear model containing measures of cardiac parasympathetic and sympathetic activity and their interaction. These results suggest that correlation dimension may provide additional information regarding cardiac stress reactivity above that provided by traditional measures of cardiac autonomic function.

Details

Original languageEnglish
Pages (from-to)465-472
JournalPsychophysiology
Volume53
Issue number4
Early online date20 Nov 2015
Publication statusPublished - Apr 2016