Marcy and Jack dig into a nineteen ninety-eight study where a month of heart-coherence practice was linked to twenty-three percent lower cortisol and doubled DHEA — with the honest caveats held — plus the two-minute recalibration practice.
Read the paper: The Impact of a New Emotional Self-Management Program on Stress, Emotions, Heart Rate Variability, DHEA and Cortisol (Rollin McCraty, Bob Barrios-Choplin, Deborah Rozman, Mike Atkinson, Alan D. Watkins, 1998, Integrative Physiological and Behavioral Science) — https://www.heartmath.org/research/research-library/clinical-health-research/impact-of-emotional-self-management-program-on-stress-emotions-hrv-dhea-cortisol/
21 Oct 2026
Morning Coherence, Ep 16: The Alarm That Won't Turn Off
Marcy and Jack take on a two thousand twenty-five review — how stress retrains the nervous system's alarm, and what small trials say coherence practice can do about it — plus the two-minute recalibration practice.
Read the paper: From Dysregulation to Coherence: Exploring the HeartMath Approach to Emotional and Physiological Regulation (Elbers and McCraty, 2025, Global Advances in Integrative Medicine and Health) — https://doi.org/10.1177/27536130251408821
20 Oct 2026
Morning Coherence, Ep 15: The Ledger Before the Bill
Marcy and Jack take on a two thousand sixteen prospective study — three hundred forty-three soldiers, a ten-minute resting heart reading taken before deployment, and what it could and couldn't predict — with the honesty caveat that prediction is not prevention, plus a two-minute settle-the-ledger morning practice.
Read the paper: Heart Rate Variability: Pre-Deployment Predictor of Post-Deployment PTSD Symptoms (Pyne, et al., 2016, Biological Psychology) — https://doi.org/10.1016/j.biopsycho.2016.10.008
19 Oct 2026
Ten Veterans, Four Weeks
Marcy and Jack take on a two thousand ten pilot study — ten combat veterans, four weeks of HRV biofeedback, sharper attention, and the honesty caveats that keep the science honest — plus a two-minute settle-the-snow-globe morning practice.
Read the paper: Cardiac Coherence and Posttraumatic Stress Disorder in Combat Veterans (Ginsberg, Berry, Powell, 2010, Alternative Therapies in Health and Medicine) — https://www.heartmath.org/research/research-library/basic/improving-cognition-in-recently-returned-combat-veterans/
18 Oct 2026
Morning Coherence, Ep 13: The Loudest Signal in Your Body
Marcy and Jack take on the spiciest paper so far — the one behind the 'your heart broadcasts to other people' idea. What's measured physics, and what needs a much bigger grain of salt.
Read the paper: The Energetic Heart: Bioelectromagnetic Interactions Within and Between People (Rollin McCraty, 2002, Institute of HeartMath monograph)
17 Oct 2026
Morning Coherence, Ep 12: The Little Brain on the Heart
Marcy and Jack dig into neurocardiology — the heart's own nervous system of more than fourteen thousand verified neurons, and why the famous forty-thousand figure doesn't check out — plus a two-minute listening-post morning practice. Read the paper: Potential clinical relevance of the 'little brain' on the mammalian heart (J. Andrew Armour, 2008, Experimental Physiology) — https://doi.org/10.1113/expphysiol.2007.041178 (https://doi.org/10.1113/expphysiol.2007.041178)
16 Oct 2026
Morning Coherence, Ep 11: The Heart Writes First
Marcy and Jack take on a two thousand nine HeartMath chapter arguing positive emotions may start in the heart, not the brain — the smooth ten-second coherence wave where heart, breath, and blood pressure lock into one groove — plus a two-minute shift-the-rhythm morning practice.
Read the paper: The Central Role of the Heart in Generating and Sustaining Positive Emotions (Rollin McCraty, Robert A. Rees, 2009, The Oxford Handbook of Positive Psychology) — https://www.heartmath.org/research/research-library/monographs/the-central-role-of-the-heart-in-generating-and-sustaining-positive-emotions/
15 Oct 2026
Morning Coherence, Ep 10: Gratitude Is Not Relaxation
Marcy and Jack take on a two thousand four chapter arguing appreciation is its own physiological mode — heart, breath, and brain locking into the same ten-second wave, measurably distinct from relaxation — plus a two-minute appreciation-locked morning practice.
Read the paper: The Grateful Heart: The Psychophysiology of Appreciation (Rollin McCraty, Doc Childre, 2004, The Psychology of Gratitude, Oxford University Press) — https://www.heartmath.org/research/research-library/basic/grateful-heart-the-psychophysiology-of-appreciation/
14 Oct 2026
Morning Coherence, Ep 9: Same Volume, Different Song
Marcy and Jack take on a nineteen ninety five cardiology study where five minutes of anger and five minutes of appreciation both turned the body's volume up — the difference was the pattern, not the amount — plus a two-minute Freeze-Frame style morning practice.
Read the paper: The Effects of Emotions on Short-Term Power Spectrum Analysis of Heart Rate Variability (Rollin McCraty, Mike Atkinson, William A. Tiller, Glen Rein, Alan D. Watkins, 1995, The American Journal of Cardiology) — https://doi.org/10.1016/s0002-9149(99)80309-9
13 Oct 2026
Morning Coherence, Ep 8: The Five-Hour Echo
Marcy and Jack take on a nineteen ninety five study where five minutes of self-generated care raised an immune antibody, and five minutes of anger suppressed it — one to five hours later — plus a two-minute self-induced-care morning practice.
Read the paper: The Physiological and Psychological Effects of Compassion and Anger (Glen Rein, Mike Atkinson, Rollin McCraty, 1995, Journal of Advancement in Medicine) — https://www.heartmath.org/research/research-library/basic/physiological-and-psychological-effects-of-compassion-and-anger/
12 Oct 2026
Morning Coherence, Ep 7: Feelings Have Fingerprints
Marcy and Jack dig into Rollin McCraty's 2015 heart-brain monograph — emotions are made heart-first. Read the paper: Heart-Brain Neurodynamics: The Making of Emotions (Rollin McCraty, 2015, HeartMath research monograph) — https://www.heartmath.org/research/research-library/basic/heart-brain-neurodynamics/
11 Oct 2026
Morning Coherence, Ep 6: Change the Broadcast
Marcy and Jack take on HeartMath's big-picture coherence model from two thousand fourteen — why eighty five to ninety percent of the vagus nerve carries traffic from heart to brain, not the other way around — plus a two-minute morning practice built on it.
Read the paper: Cardiac Coherence, Self-Regulation, Autonomic Stability, and Psychosocial Well-Being (Rollin McCraty, Maria A. Zayas, 2014, Frontiers in Psychology) — https://doi.org/10.3389/fpsyg.2014.01090
10 Oct 2026
The Paper That Named Coherence
Marcy and Jack go back to nineteen ninety six, the origin paper for cardiac coherence — twenty volunteers, five minutes of genuine appreciation, and a heart rhythm that pulled breathing and blood pressure into the same ten second wave — plus the two minute Freeze-Frame practice it was built on.
Read the paper: Cardiac Coherence: A New, Noninvasive Measure of Autonomic Nervous System Order (William A. Tiller, Rollin McCraty, Mike Atkinson, 1996, Alternative Therapies in Health and Medicine) — https://www.heartmath.org/assets/uploads/site/file/pdf/c/cardiac-coherence.pdf
9 Oct 2026
The Heart That Keeps Its Own Time
Marcy and Jack explore a twenty fifteen review arguing the heart makes its own ninety-second rhythm and that heart rate variability measures how well you recover, not just how balanced you feel, plus a two-minute capacity-building practice.
Read the paper: Heart Rate Variability: New Perspectives on Physiological Mechanisms, Assessment of Self-Regulatory Capacity, and Health Risk (Rollin McCraty, Fred Shaffer, 2015, Global Advances in Health and Medicine) — https://doi.org/10.7453/gahmj.2014.073
8 Oct 2026
Morning Coherence, Ep 3: Ten Millimeters of Calm
Marcy and Jack open HeartMath's thirty-year greatest-hits album — the two thousand sixteen monograph Science of the Heart — and a sixty-two-person trial where the coherence group lowered blood pressure about ten millimeters of mercury, plus a two-minute morning slowdown.
Read the paper: Science of the Heart: Exploring the Role of the Heart in Human Performance (Rollin McCraty, 2016, HeartMath Institute monograph) — https://242669722.hs-sites-na2.com/hubfs/Downloads/hm/science-of-the-heart-vol-2.pdf
7 Oct 2026
Morning Coherence, Ep 2: The Heart Sets the Tempo
Marcus and Dev dig into the HeartMath flagship review on heart-brain interaction — how appreciation smooths your heart rhythm into a wave your brain syncs with, plus a two-minute morning tempo reset.
Read the paper: The Coherent Heart (McCraty, Atkinson, Tomasino & Bradley, 2009, Integral Review) — https://www.heartmath.org/assets/uploads/site/file/pdf/c/coherent-heart-integral-review-2009.pdf
6 Oct 2026
Morning Coherence, Ep 1: Your Heart Is Not a Metronome
Marcus and Dev break down Shaffer, McCraty and Zerr's 2014 review 'A Healthy Heart Is Not a Metronome' — why heart rate variability means a healthy, adaptable heart — plus a 2-minute morning breathing practice.
Read the paper: A Healthy Heart Is Not a Metronome (Shaffer, McCraty & Zerr, 2014, Frontiers in Psychology) — https://doi.org/10.3389/fpsyg.2014.01040
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