Exploring the possible mechanisms of blunted cardiac reactivity to acute psychological stress

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
  • Department of Sport and Health Sciences, Oxford Brookes University, Oxford, United Kingdom
  • Department of Psychology and Neuroscience, Baylor University, Waco, TX, USA
  • Department of Psychiatry; School of Medicine, University of Pittsburgh; Pittsburgh Pennsylvania USA

Abstract

Blunted cardiovascular reactivity to acute psychological stress has been linked to a range of adverse health and behavioral outcomes. However, the origins of blunted reactivity remain unclear. The current study aimed to explore the following possibilities: different appraisals of task stressfulness and/or difficulty, diminished task effort, or reduced physiological capacity to respond. Individuals characterized, via pre-screening, as blunted (n = 17) or exaggerated (n = 16) heart rate (HR) reactors to acute psychological stress (socially evaluative mental arithmetic) were exposed to a psychological stress, cold pressor and exercise tasks during a follow-up testing session while HR and blood pressure (BP) were measured. At follow-up, groups again mounted significantly different HR reactions to psychological stress, despite reporting similar levels of subjective stress and difficulty, and achieving similar tasks scores (measure of task effort) at both testing sessions. In response to the cold pressor and exercise blunted and exaggerated reactors displayed similar HR and BP responses. Results indicated that blunted reactors do not differ from exaggerated reactors on appraisals of task stressfulness or difficulty, or objective task effort, and do possess the physiological capacity to respond to other laboratory challenges. Other sources of blunted stress reactivity remain to be explored.

Details

Original languageEnglish
Pages (from-to)1-7
JournalInternational journal of psychophysiology : official journal of the International Organization of Psychophysiology
Volume113
Early online date30 Dec 2016
Publication statusPublished - 1 Mar 2017

Keywords

  • Stress , Cardiovascular reactivity , Perceptions , Blunted , Exaggerated