Heart Rate Variability Podcast

Optimal HRV

Welcome to the Heart Rate Variability Podcast where we discuss the research and applications of heart rate variability.

  1. 6h ago

    Karen "Zuzu" Armes talks HRV, GABA, and Gut Health

    In this episode of the Heart Rate Variability Podcast, Matt Bennett speaks with Zuzu Karen Arms about the deep connection between gut health, the autonomic nervous system, and heart rate variability. Zuzu shares her personal journey of reversing epilepsy, scoliosis, and other health challenges through holistic approaches. The conversation explores how the gut microbiome supports nervous system regulation, why GABA production matters, and how gut health may influence conditions like POTS, dysautonomia, and low HRV. Matt and Zuzu also discuss nutrition, fiber, probiotics, prebiotics, acupuncture, biofeedback, and the importance of creating the right internal environment for better autonomic balance. Topics Covered Zuzu’s personal health journey and holistic recovery The relationship between gut health and the autonomic nervous system How the microbiome influences HRV and nervous system regulation GABA production in the gut and why it matters POTS, dysautonomia, and nervous system imbalance Dietary approaches for supporting gut and nervous system health Why processed carbohydrates may negatively affect GABA levels The role of fiber, prebiotics, and probiotics Maintaining healthy gut pH Acupuncture and biofeedback as supportive therapies Rethinking the modern emphasis on protein consumption Key Takeaways Gut health plays a major role in nervous system regulation, and the microbiome may directly influence HRV through mechanisms like GABA production, inflammation, and autonomic signaling. Zuzu emphasizes that supporting the gut is not just about digestion. It can also affect energy, neurological function, emotional regulation, cardiovascular control, and resilience. The discussion also challenges common nutrition assumptions, including the overemphasis on protein intake, while highlighting the importance of plant-based nutrients, fiber, and gut-friendly dietary patterns.

  2. 2d ago

    This Week In HRV – Episode 50

    Medical disclaimer: This podcast is for informational and educational purposes only and does not constitute medical advice. Please consult your healthcare provider before making any changes based on this content. Ethical Principles and Practice Standards in Clinical Biofeedback with Dr. Donald Moss — 3 APA CE credits, BCIA-aligned https://www.optimalhrv.com/event-details-registration/master-ethical-principles-practice-standards-in-clinical-biofeedback-aligned-with-bcia This Week in Heart Rate Variability. This is a milestone edition — our 50th episode in the This Week in HRV format, and the start of a more curated approach that organizes episodes around themes rather than publication timing. We begin that new chapter with performance, following the autonomic nervous system across five studies: from whether burnout leaves a measurable mark on the working heart, to the quiet self-talk that sharpens a golfer's focus, to hydrogen-rich water and faster recovery, to syncing breath with heartbeat at the edge of exhaustion, and finally to a blueprint for building biofeedback into how athletes train. RESEARCH HIGHLIGHTS THIS WEEK 1. What Your Heart Reveals About Workplace Burnout PUBLICATION: Frontiers in Physiology AUTHORS: Irina Böckelmann, Jonas Hartung, Sabine Darius, Stefan Sammito, Beatrice Thielmann KEY FINDING: In 202 employees working in interaction-heavy jobs — nursery teachers, bank clerks, and medical assistants — only about 5 percent showed elevated burnout risk. Where heart rate variability differed by burnout risk, the differences showed up in the 24-hour and daytime recordings but not during sleep, and the correlations between HRV and burnout were mostly weak. Age and gender influenced HRV more than burnout status did. SIGNIFICANCE: This is a cross-sectional study, so it can show association but not causation — it cannot tell us that burnout changes HRV or the reverse. Still, the pattern hints that if HRV is going to reflect occupational strain, daytime and on-the-job recordings may be more sensitive than overnight data. For now, HRV looks like a possible complement to validated burnout questionnaires, not a standalone screening tool. Read the full study: https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2026.1908141/full 2. How Self-Talk Quietly Sharpens Focus Under Pressure PUBLICATION: Behavioral Sciences AUTHORS: Emmanouil Tzormpatzakis, Theodoros Proskinitopoulos, Orestis Panoulas, Evangelos Galanis, Evgenia Nikolakopoulou, Nikos Comoutos, Yannis Theodorakis, Antonis Hatzigeorgiadis KEY FINDING: Forty novice golfers were split into a control group and a group trained in strategic self-talk. The self-talk group improved their putting significantly more and outperformed the control group at the final assessment, while showing greater parasympathetic activation (in the root mean square of successive differences), especially toward the later stages of the task. The authors note the HRV pattern did not reach multivariate significance. SIGNIFICANCE: The physiological signal fits an attentional explanation: self-talk may help performers execute with less mental effort, keeping the rest-and-digest system more engaged under pressure. Strategic self-talk is a low-cost, teachable tool that appears to accelerate skill learning. The performance benefit is solid; the HRV mechanism...

    This Week In HRV – Episode 50

  3. Aug 4

    This Week In HRV - Episode 49

    Medical disclaimer: This podcast is for informational and educational purposes only and does not constitute medical advice. Please consult your healthcare provider before making any changes based on this content. Ethical Principles and Practice Standards in Clinical Biofeedback with Dr. Donald Moss — 3 APA CE credits, BCIA-aligned https://www.optimalhrv.com/event-details-registration/master-ethical-principles-practice-standards-in-clinical-biofeedback-aligned-with-bcia This Week in Heart Rate Variability. In this episode, we trace the autonomic nervous system across an entire human lifespan — from a mother's anxiety reaching her baby's heart in the womb, to ADHD and the "vagal brake," to a middle school experiment on weight stigma and peer support, to how your menstrual cycle quietly reshapes your heart rhythm, all the way to AI models learning to forecast your next heartbeat. RESEARCH HIGHLIGHTS THIS WEEK 1. Does Mom's Anxiety Change Baby's Heartbeat? It Depends on Baby's Sex PUBLICATION: Journal of Affective Disorders AUTHORS: Anna M. Zhou, Sarah E. Maylott, Nicolette C. Molina, Dylan Neff, Elisabeth Conradt, Sheila E. Crowell KEY FINDING: In 159 mother-fetus pairs, higher maternal anxiety was linked to elevated fetal heart rate specifically in male fetuses, not female ones. Broader maternal depression and anxiety symptoms were tied to lower fetal heart rate variability regardless of fetal sex. SIGNIFICANCE: This suggests prenatal maternal mental health shapes fetal autonomic development in sex-specific ways, reinforcing why prenatal mental health screening matters for the baby, not just the mother. Read the full  study: https://www.sciencedirect.com/science/article/abs/pii/S0165032726011833 2. What Your Heart Rate Reveals About ADHD (And What It Doesn't) PUBLICATION: Middle East Current Psychiatry AUTHORS: Davoud Amiri, Lamberto Briziarelli, Swetang J. Shah, Sara Amiri, Hadi Rahimi-Danesh KEY FINDING: This clinical review found that reduced heart rate variability in ADHD shows up most consistently under cognitive or emotional stress, not at rest, with wide variation driven by age, medication status, and coexisting anxiety. SIGNIFICANCE: The authors propose a "phenotype-informed" framework linking autonomic profiles to emotional dysregulation and medication tolerability — a promising but still hypothesis-generating direction, not a diagnostic tool. Read the full study: https://link.springer.com/article/10.1186/s43045-026-00658-7 3. The Middle School Study That Shows Why Peer Support Protects the Heart PUBLICATION: Adolescents AUTHORS: Meghan J. Gangel, Daniel Hamill, Alleyne P. R. Broomell KEY FINDING: In 31 middle schoolers, internalized weight stigma alone didn't predict stress reactivity — but among adolescents with low peer acceptance, higher weight stigma triggered a significantly larger sympathetic stress response. High peer acceptance eliminated that effect entirely. SIGNIFICANCE: Peer belonging may physiologically buffer adolescents from the harms of internalized weight stigma, suggesting interventions should target social acceptance, not just body-image beliefs, on thei...

    This Week In HRV - Episode 49

  4. Jul 30

    Dr. Diana Driscoll on POTS, HRV, Autonomic Health, and Recovery

    In this episode of the Heart Rate Variability Podcast, Matt Bennett speaks with Dr. Diana Driscoll about her work in autonomic health, POTS, inflammation, and recovery from complex chronic illness. Dr. Driscoll shares her journey from optometrist to patient-researcher after developing POTS following a viral illness. When traditional medical care failed to help her and her family, she began investigating the underlying causes of autonomic dysfunction. She explains why she views POTS not as a single disease, but as a presentation of deeper issues involving inflammation, neurotransmitter disruption, cardiovascular problems, intracranial pressure, and genetic predispositions. The conversation also explores her development of Parasym Plus and her recovery-focused approach to treatment. Matt and Dr. Driscoll discuss how HRV can be used to track autonomic function and recovery over time, as well as the importance of persistence, proactive care, and continuing to search for answers. Topics Discussed Dr. Driscoll’s personal experience with POTS Why POTS may be a presentation, not a disease Inflammation and autonomic dysfunction Parasympathetic nervous system function Parasym Plus and neurotransmitter support HRV as a tool for tracking recovery Why Dr. Driscoll believes many patients can improve significantly Key Takeaway Dr. Driscoll offers a recovery-focused view of POTS and autonomic dysfunction, emphasizing the importance of identifying and treating the underlying causes rather than only managing symptoms.

  5. Jul 28

    This Week In HRV - Episode 48

    Medical disclaimer: This podcast is for informational and educational purposes only and does not constitute medical advice. Please consult your healthcare provider before making any changes based on this content. BCIA HRV Biofeedback Training with Dr. Inna Khazan — 16 APA CE credits https://www.optimalhrv.com/event-details-registration/bcia-aligned-hrv-biofeedback-training-led-by-dr-inna-khazan Ethical Principles and Practice Standards in Clinical Biofeedback with Dr. Donald Moss — 3 APA CE credits, BCIA-aligned https://www.optimalhrv.com/event-details-registration/master-ethical-principles-practice-standards-in-clinical-biofeedback-aligned-with-bcia This week Matt covers seven new studies spanning psychiatry, neurology, endocrinology, and sports science — from a systematic review mapping how heart rate variability is used across clinical research, to adolescent depression, suicide risk, music and athletic recovery, seizure disorders, and two studies on diabetes. It's a dense, wide-ranging episode with real implications for clinicians, coaches, and researchers alike. RESEARCH HIGHLIGHTS THIS WEEK 1. Application of heart rate variability in clinical practice and research: A systematic review of recent years PUBLICATION: Autonomic Neuroscience: Basic and Clinical AUTHORS: Camila Maldonado-Veas, Paula León, Claudia Lerma, and Juan C. Echeverría KEY FINDING: This systematic review screened recent heart rate variability literature to catalog how HRV indices are applied for diagnosis, severity staging, and disease tracking across cardiovascular, neurological, and psychiatric conditions. The authors found substantial inconsistency in which indices are reported and how confounding variables are handled across studies. SIGNIFICANCE: The authors propose a standardized roadmap for selecting and interpreting heart rate variability indices in future research, arguing that greater methodological consistency is needed before findings across studies can be meaningfully compared. Read the full study: https://cardiovasculardynamicslab.com/en/aplication-of-heart-rate-variability-in-clinical-practice-an-research-a-systematic-review-of-recent-years/ 2. Divergence of clinical and autonomic recovery in adolescent major depressive disorder: A 10-week prospective heart rate variability study with nocturnal electrocardiogram monitoring PUBLICATION: Journal of Affective Disorders AUTHORS: Haisi Chen, Xiaona Zhang, Shuning Hong, Zhenghe Yu, and Wanlin Chen KEY FINDING: In forty-three adolescent inpatients with major depressive disorder followed for ten weeks of routine treatment, depression and anxiety symptoms improved significantly, but only about seven percent achieved early clinical response. Heart rate variability deficits present at baseline did not normalize, and autonomic function instead shifted further toward sympathetic dominance by the end of the study. SIGNIFICANCE: Clinical symptom improvement and autonomic recovery may follow independent tracks in adolescent depression. Reduced somatic anxiety was associated with less sympathetic deterioration, though this reflects a correlation rather than evidence that...

    This Week In HRV - Episode 48

  6. Jul 21

    This Week In HRV - Episode 47

    DISCLAIMER: This podcast and its accompanying show notes are for educational and informational purposes only and are not a substitute for professional medical, psychological, or clinical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare professional with any questions you may have regarding a medical condition. Dr. Inna Khazan's HRV Biofeedback Training (BCIA-aligned, 16 APA CE credits) Registration Link: https://www.optimalhrv.com/event-details-registration/bcia-aligned-hrv-biofeedback-training-led-by-dr-inna-khazan Dr. Donald Moss's Ethical Principles and Practice Standards in Clinical Biofeedback (BCIA-aligned, 3 APA CE credits)  Registration Link: https://www.optimalhrv.com/event-details-registration/master-ethical-principles-practice-standards-in-clinical-biofeedback-aligned-with-bcia This week we cover five studies that stretch heart rate variability into some surprising territory. We start with elite wrestlers and what heart rate variability reveals about training recovery, move into the modern office to look at heart rate variability as an objective marker of musculoskeletal pain risk, and head into neurology for two studies on seizure diagnosis and unexplained neurological symptoms. We close with a study on sound your ears can't consciously hear, but your nervous system apparently can. RESEARCH HIGHLIGHTS THIS WEEK 1. Investigating the Acute Effect of Different Training Protocols on Heart Rate Variability PUBLICATION: Sports AUTHORS: Burhan Demirkıran, Tuba Melekoğlu, Grzegorz Żurek KEY FINDING: In thirteen elite Greco-Roman wrestlers, both high-intensity interval training and prolonged endurance training produced dramatic acute suppression of heart rate variability, with SDNN dropping seventy-three to eighty-two percent immediately after exercise, followed by partial recovery at the twenty-four-hour mark. After correcting for multiple comparisons, there was no statistically significant difference between the two training protocols. SIGNIFICANCE: Coaches often assume that different training modalities carry meaningfully different acute costs to the nervous system, but this study suggests that intense effort of either type may impose a comparable autonomic burden, at least in this population and time frame. That has real implications for how training loads are planned in the days leading up to competition. Read full study: https://www.mdpi.com/2075-4663/14/7/299 2. Heart Rate Variability as an Objective Biomarker for Work-Related Musculoskeletal Disorder Risk: A Cross-Sectional Study of Hong Kong (China) Professionals PUBLICATION: Exploration of Musculoskeletal Diseases AUTHORS: Adrian Low, Benny Lam KEY FINDING: In 105 Hong Kong office professionals, lower heart rate variability coherence was associated with higher musculoskeletal pain intensity and a broader spread of pain across the body, even after accounting for self-reported stress. Forward head posture and thoracic kyphosis helped explain part of the relationship between coherence and neck and shoulder pain, and daily sedentary hours changed the strength of the overall association. SIGNIFICANCE: This cross-sectional study points to heart rate variability coherence a...

    This Week In HRV - Episode 47

  7. Jul 16

    Debunking the LF/ HF Ratio Myth with Dr. Fred Shaffer

    Join host Matt Bennett and Dr. Fred Shaffer on the Heart Rate Variability Podcast as they debunk common misconceptions about the low-frequency to high-frequency (LF/HF) ratio. Dr. Shaffer explains how short-term low-frequency power more accurately reflects blood pressure regulation than sympathetic tone, and clarifies that everyday stress is often simply vagal withdrawal rather than a true fight-or-flight sympathetic response. He also recommends more reliable metrics for assessing autonomic balance, such as RMSSD. Finally, the episode introduces Mentor, a custom AI tool rigorously trained on peer-reviewed biofeedback and HRV research, designed to serve as a reliable, 24/7 educational tutor for both practitioners and enthusiasts.

  8. Jul 13

    This Week In HRV - Episode 46

    DISCLAIMER: This podcast and its accompanying show notes are for educational and informational purposes only and are not a substitute for professional medical, psychological, or clinical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare professional with any questions you may have regarding a medical condition. This week we're covering eight new studies spanning addiction, psychiatry, neonatal care, occupational health, women's health, and exercise science. You'll hear how alcohol cues and stress pull on heart rate variability in different directions, how short-term heart rate variability tracked suicide risk in hospitalized patients, how much a simple change in posture shifts your numbers, and more. As always, we break down what each study actually found, what it means for your practice, and where the caveats live. RESEARCH HIGHLIGHTS THIS WEEK 1. The link between subjective feelings (arousal and craving) and physiological responses (heart rate variability) in stress- and alcohol cue-reactivity among young adults engaged in hazardous drinking: a counterbalanced study PUBLICATION: Addictive Behaviors AUTHORS: Insan Firdaus, Annet Kleiboer, Anne Marije Kaag, Anja C. Huizink KEY FINDING: In 56 young hazardous drinkers, handling an alcoholic beverage increased both craving and heart rate variability, while a mental arithmetic stress task raised subjective stress without increasing craving at all. When the stress task came first, exposure to the alcohol cue afterward actually lowered perceived stress. SIGNIFICANCE: Craving and stress don't always move together, which means "avoid your triggers" may be an incomplete relapse-prevention strategy. Alcohol cues may function as a short-term emotional reset for some hazardous drinkers, independent of craving itself. Read the full study:  https://www.sciencedirect.com/science/article/pii/S0306460326001875 2. Short-term HRV dynamics track suicide risk changes in depressive inpatients: A retrospective one-week longitudinal study PUBLICATION: Journal of Affective Disorders AUTHORS: Yi Wang, Chaohua Huang, Baoyi Zhong, Yang Lu, Hao Yu, Yujie Liu, Lanyang Gao, Bo Xiang, Tingting Wang, Kezhi Liu KEY FINDING: Across 177 depressive inpatients, those with moderate-to-high suicide risk showed faster heart rate and lower heart rate variability at admission. As suicide risk dropped over one week of treatment, heart rate variability recovered in step, independent of changes in depression, anxiety, or sleep. SIGNIFICANCE: This is an association, not proof of causation, but it's a compelling one: the heart rate variability signal tracked suicide risk specifically, not just general symptom improvement. That raises real potential for an objective, adjunctive signal in inpatient risk monitoring. Read the full study: https://www.sciencedirect.com/science/article/abs/pii/S0165032726010852 3. Postural Impacts Based on HRV in Young Adults – A Statistical Analysis PUBLICATION: Procedia Computer Science AUTHORS: Prashant Kumar, Ashis Kumar Das, Suman Halder KEY FINDING: Testing three postures in young adults, researchers found statistically significant differences across nearly every heart rate variability parameter, with approximate entropy the lone exception. Short-term and long-term variability measures stayed strongly correlated regardless of posture. SIGNIFICANCE:

    This Week In HRV - Episode 46
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Welcome to the Heart Rate Variability Podcast where we discuss the research and applications of heart rate variability.

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