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HERO ID
3976391
Reference Type
Journal Article
Title
Heart rate complexity: A novel approach to assessing cardiac stress reactivity
Author(s)
Brindle, RC; Ginty, AT; Phillips, AC; Fisher, JP; Mcintyre, D; Carroll, D
Year
2016
Is Peer Reviewed?
1
Journal
Psychophysiology
ISSN:
0048-5772
EISSN:
1469-8986
Volume
53
Issue
4
Page Numbers
465-472
Language
English
PMID
26585809
DOI
10.1111/psyp.12576
Web of Science Id
WOS:000372889100005
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.
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