In Episode 24 of the Heart Rate Variability Podcast, we explore five recent studies that span trauma recovery, personality theory, migraine prediction, heart failure monitoring, and fundamental vagal sensory mechanisms. Together, these papers deepen our understanding of HRV not as a static metric, but as a dynamic signal shaped by interoception, context, and time.

This episode emphasizes HRV as a marker of felt safety, autonomic integration, and physiological sensing, highlighting how vagal activity reflects not only brain-mediated regulation but also incoming sensory information from the body. Implications are discussed for clinicians, researchers, and individuals seeking a more nuanced and compassionate understanding of nervous system function.

This podcast is for educational and informational purposes only and does not constitute medical advice. The information presented is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional before making changes to medical care, mental health treatment, or lifestyle practices.

Full Title:
From Somatic Experiencing to felt safety: Assessing the effects of a body-oriented intervention in adults with various degrees of child maltreatment

Authors:
Jörgen Lehmivaara
Billy Jansson
Jens Bernhardsson
Marylène Cloitre
Monique C. Pfaltz

Journal:
European Journal of Psychotraumatology

Publication Year:
2026

Key Points:
• A brief Somatic Experiencing–based intervention significantly increased psychological safety
• Participants showed improvements in affect and social connectedness
• Heart rate decreased, and HRV increased during the intervention
• Reductions in disrupted body boundaries and increased interoceptive awareness were observed
• Findings support felt safety as an embodied, physiologically measurable state

Article Link:
https://doi.org/10.1080/20008066.2026.2613544

Full Title:
Integrating autonomic and affective pathways in borderline personality disorder: The triangle therapy hypothesis

Author:
Daniel Juraszek

Journal:
Frontiers in Psychology

Publication Year:
2026

Key Points:
• Proposes a somatic pre-phase intervention targeting autonomic regulation
• Centers on exposure to silence, sound, and isolation as ancestral affective conditions
• Frames BPD as a disorder of autonomic-affective integration rather than cognition alone
• Suggests HRV as a physiological marker of treatment readiness and integration
• Emphasizes bottom-up tolerance before top-down therapeutic work

Article Link:
https://www.frontiersin.org/articles/10.3389/fpsyg.2026.1686068/full

Full Title:
Heart rate variability as a predictor of migraine: Sleep-time data analysis of pre-migraine nights

Authors:
Rūta Jankevičiūtė
Viroslava Kapustynska
Vytautas Abromavičius

Journal:
Technology and Health Care

Publication Year:
2026

Key Points:
• Sleep-time HRV patterns differed on nights preceding migraine attacks
• Significant inter-individual variability was observed
• Machine-learning models showed promise for personalized prediction
• HRV appears most useful when analyzed longitudinally within individuals
• Highlights sleep as a low-noise window for autonomic assessment

Article Link:
https://doi.org/10.1177/09287329251412968

Full Title:
Physiological characterisation of severe heart failure using long-duration ambulatory ECG: A retrospective exploratory analysis

Authors:
Junaid Aamir Khan
Usman Ali
Md Tanzim Ahsan
Ratan Chandra Roy
Opeyemi S. Alamu
Francesco Alessi Longa

Journal:
Cureus

Publication Year:
2026

Key Points:
• Severe heart failure patients showed globally reduced HRV
• Substantial within-subject variability was observed across recording periods
• HRV and heart rate did not always move together
• Long-duration recordings captured dynamics missed by short assessments
• Supports continuous monitoring for detecting instability and decompensation

Article Link:
https://www.cureus.com/articles/456345

Full Title:
Vagal blood volume receptors compensate for haemorrhage and posture change

Authors:
Zhikai Liu
Shan Lu
Isabela A. Haskell
Michael S. Schappe
Maša Josipović
Soohong Min
AbdulRasheed A. Alabi
Jingyi Chi
Minseon Kim
Stephen D. Liberles

Journal:
Nature

Publication Year:
2026

Key Points:
• Identified vagal sensory neurons expressing PIEZO2
• These neurons encode central blood volume, not just pressure
• Essential for compensation during posture change and blood loss
• Loss of these receptors impaired autonomic stability
• Reframes vagal tone as a sensory-regulatory loop

Article Link:
https://www.nature.com/articles/s41586-025-10010-4

This episode is sponsored by Optimal HRV.

Optimal HRV provides trauma-informed, research-based heart rate variability biofeedback tools for clinicians, researchers, and individuals. The platform integrates HRV assessment, guided breathing, biofeedback training, and professional education to support nervous system regulation and resilience.

Learn more at:
https://optimalhrv.com