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 treating anxiety symptoms restores healthy autonomic function.

Read the full study: https://www.sciencedirect.com/science/article/abs/pii/S0165032726007925?via%3Dihub

3. Heart rate variability reactivity moderates the relationship between behavioral disinhibition and suicide attempts in mood disorders

PUBLICATION: Journal of Affective Disorders

AUTHORS: Mete Ercis, Ozan Can Gürşahbaz, Furkan Durmuş, and Alp Üçok

KEY FINDING:

Among sixty-one inpatients with a major depressive episode, initial group differences in resting heart rate variability and impulse-control task performance disappeared once age was controlled for. However, participants with more impulsive errors on the task had a history of suicide attempts, specifically when their heart rate variability reactivity to the task was blunted.

SIGNIFICANCE:

The authors describe this as exploratory and proof-of-concept. The finding suggests that the combination of behavioral impulsivity and impaired autonomic stress flexibility, rather than either alone, may characterize a specific high-risk phenotype worth further study.

Read the full study: https://www.sciencedirect.com/science/article/abs/pii/S0165032726011389

4. Effect of BPM music on post-exercise heart rate variability in male collegiate sprinters

PUBLICATION: Frontiers in Sports and Active Living

AUTHORS: Chen Bao, Jiayi Li, Ran Gao, Shixiang Zhang, and Jiameng Wang

KEY FINDING:

Among two hundred sixty-five male collegiate sprinters randomized to a no-music control group or one of nine music-tempo conditions during post-exercise recovery, the 120 BPM condition showed comparatively favorable heart rate and heart rate variability recovery.

SIGNIFICANCE:

The authors caution that this tempo is not universally optimal and call for further research into music's broader role in exercise recovery. Still, it's a low-cost variable coaches can reasonably test with individual athletes.

Read the full study: https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2026.1814697/full

5. Cardiac Autonomic Modulation in Seizure Disorders With and Without Interictal Epileptiform Discharges: A Retrospective Heart Rate Variability Analysis Using Archived Digital EEG Recordings

PUBLICATION: Cureus

AUTHORS: Raihan Mannan, Md. Zabihullah, Kamlesh Jha, Saran AK, and Zakiyyah Tasneem

KEY FINDING:

Using ECG signals extracted retrospectively from archived EEG recordings, both seizure-disorder groups studied showed lower vagally mediated heart rate variability than non-seizure neurological controls, regardless of whether interictal epileptiform discharges were present.

SIGNIFICANCE:

Autonomic disruption in seizure disorders appears tied to the underlying condition broadly, rather than to interictal epileptiform discharges specifically, suggesting these discharges add little independent predictive value for autonomic risk.

Read the full study: https://www.cureus.com/articles/513332-cardiac-autonomic-modulation-in-seizure-disorders-with-and-without-interictal-epileptiform-discharges-a-retrospective-heart-rate-variability-analysis-using-archived-digital-eeg-recordings

6. Reduced heart rate variability predicts incident diabetic polyneuropathy

PUBLICATION: Frontiers in Endocrinology

AUTHORS: Dimitrios Tsilingiris, Daniel Schmalzridt, Omar Eldesouky, Florian Kalb, Viktoria Flegka, Ekaterina von Rauchhaupt, Theresa Hoefer, Stefan Kopf, Thomas Fleming, Stephan Herzig, Anna Hohneck, Julia Szendroedi, and Zoltan Kender

KEY FINDING:

In two hundred eighty-eight people with diabetes, baseline cardiovascular autonomic neuropathy and reduced heart rate variability were cross-sectionally associated with existing polyneuropathy. Among participants without polyneuropathy at baseline, followed for roughly three years, baseline autonomic neuropathy independently predicted who went on to develop it, consistent across three diagnostic definitions.

SIGNIFICANCE:

This positions heart rate variability as a practical, low-cost tool for identifying diabetic patients at elevated risk of developing polyneuropathy, supporting earlier preventive foot care and glycemic management.

Read the full study: https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2026.1880532/full

7. Serum Orexin A Levels and Heart Rate Variability Parameters in Newly Diagnosed, Treatment-Naïve Type 2 Diabetes Mellitus: A Case-Control Study

PUBLICATION: Cureus

AUTHORS: Abebe T. Gebrye, Narayan Dutt Soni, Puneet Rijhwani, Aparna Garg, and Md S. Hussain

KEY FINDING:

Comparing one hundred newly diagnosed, treatment-naïve type 2 diabetes patients with fifty age-matched healthy controls, the diabetic group showed significantly lower serum orexin A and markedly impaired heart rate variability across time- and frequency-domain measures. Within the diabetic group, orexin A levels showed no significant linear correlation with any heart rate variability index.

SIGNIFICANCE:

The lack of correlation suggests these two disruptions may occur independently rather than through a shared causal pathway, cautioning against assuming that co-occurring abnormalities are necessarily mechanistically linked.

Read the full study: https://www.cureus.com/articles/509762-serum-orexin-a-levels-and-heart-rate-variability-parameters-in-newly-diagnosed-treatment-nave-type-2-diabetes-mellitus-a-case-control-study

KEY THEMES

SPONSORED BY OPTIMAL HRV

This episode is sponsored by Optimal HRV. The Optimal HRV app offers a structured morning measurement protocol, longitudinal tracking to help you see meaningful trends over time, and built-in biofeedback tools for practicing paced breathing and physiological regulation.

Optimal HRV also offers professional training for clinicians:

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

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.