Heart Rate Variability Podcast

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...

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.

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...

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...

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.