Reduced heart rate variability (HRV) has proved to be an independent risk factor for cardiac emergencies. The present study aimed to evaluate differences in HRV in healthy volunteers high or low in anxiety sensitivity (AS) and potential changes in HRV following an interoceptive exposure (IE) training. We aimed to identify subject features that are associated with potential changes in HRV. Methods: Data were obtained in five subjects high and five subjects low in AS (aged 19 to 23).
ECG recordings were conducted in supine position in a mock scanner environment during three experimental conditions. Recordings were repeated after three to seven days of IE training. The square root of successive R-R- interval differences (RMSSD) was calculated for HRV assessment. Potential correlations between subject features and change in HRV were tested with Spearman’s rank correlation. Results: No significant HRV differences between subjects high and low in AS in any of the experimental conditions were observed, neither before nor after the IE training. On a descriptive level, subjects high in AS showed lowered HRV compared to subjects low in AS before IE. After IE, subjects low in AS demonstrated increased HRV, while subjects high in AS showed decreased HRV measures. Correlation analyses revealed no significant associations.
Conclusion: Descriptive results indicate that there are AS-related differences in HRV, with subjects high in AS showing lowered HRV as hypothesized. Following IE, subjects low in AS showed an increase in HRV, while a decrease occurred in subjects high in AS. The mechanisms of IE require further investigation. If replicated in a larger sample and with adequate study design, IE could prove to lower individual risk for cardiac complications by increasing HRV. Future design implications are discussed.
Table of Contents
Abstract
Introduction
Objective
Health stability through heart rate variability
Relevance of heart rate variability assessment to pathological anxiety
A focus on interoceptive exposure
Methods
Procedure
Measures
Clinical assessments
ECG Recording
Functional MRI data acquisition
Experimental procedures
IE training
Cardiac symptom provocation task
Data preprocessing and analysis
ECG data
Functional MRI data
Statistical analyses
Results
Sample characteristics
Group comparison of heart rate variability
Change in heart rate variability
Characteristics associated with change in heart rate variability
Discussion
Group comparison of heart rate variability
Change in heart rate variability
Characteristics associated with change in heart rate variability
Additional observations
Study limitations
Conclusion and perspective
References
Objective & Topics
This thesis investigates whether healthy individuals with high anxiety sensitivity (AS) exhibit reduced heart rate variability (HRV) and explores the potential for HRV improvement through a brief interoceptive exposure (IE) intervention module.
- Heart rate variability as a physiological marker for emotional regulation
- The relationship between anxiety sensitivity and autonomic nervous system function
- Malleability of HRV through interoceptive cognitive-behavioural exercises
- Neural correlates of interoceptive processing and their link to cardiac control
Excerpt from the Book
A focus on interoceptive exposure
Since HRV is continuously adapted from beat to beat (Task Force, 1996), there should be a relevant change in HRV observable succeeding certain forms of intervention, possibly beta-blocking medication (Cook et al, 1991; Lampert, Ickovics, Viscoli, Horwitz, & Lee, 2003) or psychotherapy (Garakani et al., 2009). Investigations focussing on the malleability of HRV through psychotherapy are scarce. Garakani et al. (2009) reported an increase in HRV at rest and with paced breathing succeeding 12 sessions of cognitive-behavioural therapy (CBT) in a sample of patients diagnosed with PD. CBT was implemented as an intervention bundle including psychoeducation, breathing training, progressive muscle relaxation, cognitive restructuring, interoceptive and situational in vivo exposure practice. In addition to the improvement of quality of life and well-being, cognitive-behavioural interventions appeared to have beneficial psychophysiological effects. They may execute cardio-protective effects and lower panic patients’ risk for suffering cardiovascular complications by adjusting HRV. The active components of such intervention bundles have not been explored separately yet.
One crucial component of panic-focused psychotherapy is IE practice for triggering panic-related bodily sensations and tolerating these sensations (Craske & Barlow, 2007). Cardiac complaints, notably chest pain, palpitations or subjectively perceived extra-systoles and tachycardia, are among the most frequently reported cardiac symptoms by patients diagnosed with PD (Barsky, Cleary, Sarnie, & Ruskin, 1994; Fleet et al., 1996), and are usually among the initial sensations triggering the symptom cascade of a full-symptom panic attack (American Psychiatric Association, 2000). Besides, cardiac sensations were reported as one symptom of a typical panic attack by 93.2% of patients interviewed by Andor, Gloeckner-Rist, Gerlach, and Rist (2008). With regard to Clark’s cognitive theory of PD (Clark, 1986), natural autonomic activity is misinterpreted as signal of severe health damage leading to increased fear which further escalates in more intense somatic sensations, creating a reciprocating circle.
Summary of Chapters
Introduction: Outlines the research objectives regarding AS-related differences in HRV and the potential for HRV adjustment through interoceptive exposure.
Methods: Describes the recruitment of volunteers, the clinical assessment tools, the experimental environment (mock scanner), and the fMRI and ECG data acquisition protocols.
Results: Presents the findings regarding sample characteristics, group comparisons of HRV, and correlations between psychological/neural characteristics and changes in HRV.
Discussion: Interprets the findings on AS-related HRV differences, evaluates the impact of the IE training, discusses limitations such as small sample size, and suggests future research directions.
Keywords
Heart rate variability, HRV, anxiety sensitivity, AS, interoceptive exposure, IE, autonomic nervous system, neurovisceral integration, panic disorder, RMSSD, cardiac control, emotion regulation, functional MRI, anxiety disorders, cognitive-behavioural intervention.
Frequently Asked Questions
What is the core focus of this research?
The study investigates the relationship between anxiety sensitivity (AS) and heart rate variability (HRV) in healthy volunteers, specifically examining whether HRV can be altered via short-term interoceptive exposure training.
What are the primary themes addressed in this work?
The main themes include cardiac-autonomic regulation, the neurovisceral integration model of emotional processing, the concept of anxiety sensitivity as a subclinical risk factor, and the plasticity of HRV in response to psychological interventions.
What is the central research question?
The study asks whether individuals with high anxiety sensitivity display lower baseline HRV compared to low-AS individuals, and whether a brief interoceptive training module can induce positive changes in HRV.
Which scientific methods are utilized?
The research employs a cross-sectional and longitudinal design, utilizing ECG monitoring for HRV assessment (RMSSD), functional MRI to observe brain activation during interoceptive anticipation, and standardized psychological questionnaires.
What does the main body of the work cover?
It provides an extensive review of the literature regarding HRV and pathological anxiety, details the methodology for the experiment conducted in a mock MRI scanner, and presents quantitative results and discussions on the observed physiological and neural data.
Which keywords best describe this study?
The study is characterized by terms like heart rate variability, anxiety sensitivity, interoceptive exposure, neurovisceral integration, and cardiac control.
How does anxiety sensitivity affect heart rate variability?
The study describes that, on a descriptive level, subjects high in AS showed lowered HRV compared to subjects low in AS, suggesting a possible link between high anxiety sensitivity and reduced autonomic flexibility.
What were the findings regarding the interoceptive exposure training?
While no significant changes were detected across the entire sample, the study noted descriptive differences where subjects low in AS increased their HRV post-training, whereas subjects high in AS showed a decrease.
What is the role of the mock scanner environment in this research?
The mock scanner served as a standardized experimental environment to minimize confounding variables, although the study discusses it as a potential source of stress that may have influenced autonomic responses.
What is the significance of the "neurovisceral integration" in this context?
It provides the theoretical framework for how brain areas, such as the insular cortex and anterior cingulate cortex, bridge emotional processing and the physiological control of heart rate variability.
- Arbeit zitieren
- Susann Wichmann (Autor:in), 2008, Differences in heart rate variability in subjects high and low in anxiety sensitivity before and after an interoceptive exposure training, München, GRIN Verlag, https://www.grin.com/document/489363
