The science of Human Coherence

BioMastering Institute is an independent, nonprofit research and education institute studying how the human organism holds itself together — and what happens, measurably, when it does. We build on three decades of heart-rate-variability and physiological-coherence research and extend it into a multidimensional, testable model of the whole person.

Read the framework Explore the evidence library

Founded by Dr. Oskar Knapik and Anna Ziarkowska. Forming in the United States as a nonprofit corporation; application for recognition under Section 501(c)(3) of the Internal Revenue Code in progress. No products are sold on this site.

Independent nonprofitResearch and education institute. Not a clinic, not a vendor, not a certification body.

Evidence-tieredEvery claim on this site is marked as established, working hypothesis, or frontier.

Open sciencePre-registered protocols, open data and code, publication regardless of result.

Research-readyDefined construct, measurement plan and five research programs open to partners and funders.

What Human Coherence is

A single quantity describing how well the parts of a living person work as one. It is the object of everything the Institute measures, tests and teaches.

Human Coherence is the degree to which the components and subsystems of a living organism are dynamically coordinated — synchronized in time, mutually informative and adaptively co-regulated — so that the organism operates as an integrated, self-maintaining and self-correcting whole.

Graded

Coherence is a degree, not a binary. Every person has some; nobody has all of it; it rises and falls across the day, the year and the lifespan.

Multi-level

It can be defined at every scale of organization — molecular, cellular, autonomic, endocrine, psychological and social — and the levels are coupled.

Operationalizable

It is measured through established biomarkers and, crucially, through the agreement between them over time.

Why it matters

The progressive loss of coherence is a shared signature of chronic stress, disease and aging. Heart-rate variability declines steadily across nine decades of life; physiological signals lose their fractal complexity with age and illness; regulatory set-points drift; the cost of maintaining stability — allostatic load — rises until the system can no longer pay it. These are not four stories. They are four views of one process.

If coherence is one quantity, it can be measured as one quantity, and its restoration can be tested as an outcome. That is the Institute's research question.

Where the word comes from

In physics, coherence describes oscillations that keep a stable relationship in phase and frequency — the difference between laser light and lamplight. In physiology, the term was introduced to describe order and stability in the body's rhythmic activities: within a single rhythm (autocoherence), between rhythms (cross-coherence, as when breathing, blood pressure and heart rhythm entrain), and across the whole system (global coherence). Human Coherence keeps those meanings and extends them across the levels at which a human being is organized.

Coherence is agreement, not level

A weak laser is coherent; a bright bulb is not. Two people can have identical averages on every biomarker and differ entirely in coherence, because coherence is a property of the relationships between signals over time, not of any single value. A person whose skin conductance reports calm while the heart rhythm reports alarm is incoherent, however good each number looks alone. Divergence between parameters is an early signal: it appears before any one of them crosses a clinical threshold — and improving one parameter in isolation can lower coherence rather than raise it.

⚠ Working hypothesis The concordance principle draws on the SWR DO framework in bioelectronics (Olejarz, 2026) and on the distinct sympathetic innervation of electrodermal activity (Boucsein, 2012). It is testable, and it is the primary object of research program RP-1.

Where the science already stands

Human Coherence is a new construct, but it rests on findings that are not new. Ten results from the peer-reviewed literature carry the weight of the framework. Bracketed numbers point to the evidence library below.

Heart-rate variability indexes the nervous system's capacity to regulate the body. Low HRV predicts cardiac events and all-cause mortality in population cohorts, independent of conventional risk factors.
Framingham Heart Study [Tsuji et al., 1994] [1996]; ARIC Study [Dekker et al., 2000]; meta-analysis [Jarczok et al., 2022]; measurement standards [Task Force, 1996]
HRV declines with age, and higher HRV accompanies healthy longevity. Time-domain HRV falls across nine decades of life; older adults with unusually high HRV show unusually good survival.
[Umetani et al., 1998]; [Zulfiqar et al., 2010]; loss of physiological complexity with age [Lipsitz & Goldberger, 1992] [Goldberger et al., 2002]
Vagally mediated HRV tracks the brain circuits that support self-regulation. The neurovisceral integration model links prefrontal–subcortical control, cardiac vagal tone, emotion regulation, executive function and health outcomes.
[Thayer & Lane, 2000]; [Thayer et al., 2009]; neuroimaging meta-analysis [Thayer et al., 2012]; the heart's own neural network [Armour, 2004]
A distinct, sine-wave-like heart-rhythm pattern near 0.1 Hz — physiological coherence — can be self-generated and measured. In this state heart rhythm, respiration and blood-pressure oscillations entrain, vagal activity rises, and the HRV spectrum shows a narrow high-amplitude low-frequency peak. Analysis of 1.8 million biofeedback sessions confirmed 0.10 Hz as the most common coherence frequency.
[McCraty et al., 1995]; [Tiller et al., 1996]; [McCraty et al., 2009]; [McCraty & Zayas, 2014]; [Balaji et al., 2025]
Training coherence works. Randomized trials and meta-analyses show that HRV biofeedback and resonance-frequency breathing improve emotional and physical health, stress and anxiety, and performance.
[Lehrer & Gevirtz, 2014]; [Goessl et al., 2017]; [Lehrer et al., 2020]; DHEA/cortisol response to emotional self-regulation training [McCraty et al., 1998]
Chronic stress leaves molecular traces — and some of them are reversible. Social stress shifts leukocyte gene expression toward inflammation; biological age measured by DNA methylation rises under stress and returns after recovery.
[Cole et al., 2007]; [Fredrickson et al., 2013]; [Poganik et al., 2023]; allostasis and allostatic load [McEwen, 1998]
Biological age and the pace of aging can be measured. Epigenetic clocks estimate biological age from DNA methylation; DunedinPACE estimates how fast a person is aging from a single sample. Loss of epigenetic information has been proposed as a cause of aging.
[Horvath, 2013]; [Belsky et al., 2022]; [Yang et al., 2023]; [López-Otín et al., 2023]
Regulatory set-points drift, and the drift can originate centrally. Dilman's law of deviation of homeostasis proposed that aging is a rising threshold of hypothalamic sensitivity to feedback; hypothalamic inflammatory signaling was later shown to program systemic aging in mice.
[Dilman, 1981]; [Zhang et al., 2013]
Living systems are coupled oscillators kept in order far from equilibrium. Synchronization theory, dissipative structures, autopoiesis, the free-energy principle and cybernetics give the formal language in which coherence can be defined and modelled.
[Strogatz & Stewart, 1993]; [Prigogine & Stengers, 1984]; [Maturana & Varela, 1980]; [Friston, 2012]; [Wiener, 1948]; [Ashby, 1956]; [Mazur, 1966]
Age-related decline is a codable condition. The eleventh revision of the International Classification of Diseases includes ageing-associated decline in intrinsic capacity (MG2A) and an "ageing-related" extension code (XT9T), placing the decline that coherence research targets within the domain of measurable, reportable and therefore addressable conditions.
[WHO ICD-11, 2022 revision]

Built on the coherence tradition

For more than thirty years the HeartMath Institute — a 501(c)(3) research and education organization in Boulder Creek, California — has studied the relationship between emotion, heart rhythm and the autonomic nervous system. Its first coherence study appeared in the American Journal of Cardiology in 1995. The field it helped establish, HRV coherence biofeedback, has since been validated in independent randomized trials and meta-analyses. Human Coherence begins where that tradition has arrived.

Illustration

Irregular rhythmCoherent rhythm Schematic, not patient data. The coherent pattern is a narrow, high-amplitude peak in the low-frequency band of the HRV spectrum (McCraty et al., 2009).

What the coherence tradition establishedSummarized from the physiological coherence model (McCraty et al., 2009; McCraty, 2015; McCraty & Zayas, 2014)

Emotion is written in the pattern of the heart rhythm, not only in the amount of variability. Distinct emotional states produce distinct rhythm patterns at the same heart rate.
A coherent rhythm is a stable, sine-wave-like oscillation with a narrow, high-amplitude peak in the low-frequency band, typically near 0.1 Hz. It is quantified as a coherence ratio: the power at that peak relative to the rest of the spectrum.
In the coherent state the body's oscillators entrain: respiration, blood pressure and heart rhythm lock to one frequency, vagal activity rises, and heart–brain synchrony increases.
Information travels in timing. The intervals between beats carry information; afferent traffic from the heart reaches the thalamus, amygdala and cortex and shapes perception, cognition and self-regulation.
Coherence is trainable. Self-generated positive emotion, combined with slow rhythmic breathing, produces and sustains the state, with measurable gains in self-regulatory capacity, cognition and well-being.
Coherence scales. The same principles describe pairs, families and teams (social coherence); the Global Coherence Initiative studies possible links between human physiology and Earth's geomagnetic environment as an open research question.

What Human Coherence addsThe Institute's extension of the construct — each item is a hypothesis the research program is designed to test

From one oscillator to the whole architecture. Cardiac coherence is the core measure of one level (K4) in a four-level model that also measures regulatory, informational (epigenetic) and bioelectromagnetic coherence.
From level to agreement. Human Coherence is scored on the dynamic concordance between signals — heart rhythm, electrodermal activity, cortisol rhythm, circadian markers — not on any single value.
From state to trajectory. The primary long-term endpoint is the pace of biological aging (DunedinPACE, epigenetic clocks) over months and years, not only the momentary state.
From physiology to control architecture. A three-layer model — Operator, Regulator, Executor — predicts where an intervention must begin and why single-layer interventions plateau.
From measurement to method. Rhythmic physiology is modelled as periodically correlated time series, a statistical framework built for cyclic processes, so that coherence can be estimated across circadian, weekly and seasonal cycles rather than in isolated sessions.
From a technique to a science. The Institute's aim is a construct with a definition, a metric, norms and a validation record — usable by any laboratory, with any instrument.

HeartMath® is a registered trademark of HeartMath, Inc. BioMastering Institute is an independent organization and is not affiliated with, sponsored by or endorsed by the HeartMath Institute or HeartMath, Inc.; its research is cited here as part of the scientific record. Coherence-focused frameworks developed elsewhere — including the biofield-coherence definition published by Coherence Wellness (Dubai) within the biofield-science tradition (Rubik et al., 2015) — are acknowledged in the comparison of constructs below.

The multidimensional Human Coherence framework

One quantity, measured at four levels, inside a three-layer control architecture. The framework is designed so that every element is either an established measurement or a stated hypothesis with a planned test.

Four levels of coherence

Each level has an operational definition, a research lineage, a set of metrics and an evidence status. The levels are numbered for reference, not ranked: K4 is the most mature and the entry point of every study; K1 is the most exploratory.

Level	Operational definition	Lineage	Metrics	Evidence status
K4Psychophysiological	Integration of the self-regulating person: vagal tone, heart–breath synchrony, level of sympathetic arousal, stability of self-image and emotional regulation.	Thayer; Porges; McCraty; Maltz	RMSSD and HF-HRV; HRV coherence ratio; electrodermal activity (SCL, SCR); cortisol awakening response; validated self-report scales	✓ Established Markers and their health associations are well replicated.
K3Informational	Fidelity of cellular identity: how far the methylome has drifted from its youthful reference, and how fast it is drifting.	Horvath; Belsky; Sinclair	Epigenetic clocks (PhenoAge, GrimAge); DunedinPACE pace-of-aging; inflammatory load (hs-CRP)	✓ Established ⚠ Hypothesis Markers established; their responsiveness to coherence interventions is under test.
K2Regulatory	Precision of the body's feedback loops and synchrony of peripheral clocks with the central clock.	Dilman; Cai; chronobiology	HOMA-IR and fasting insulin; diurnal cortisol profile; core-temperature and sleep rhythms; actigraphy	✓ Established ⚠ Hypothesis Markers established; the composite regulatory-coherence index is under validation.
K1Bioelectromagnetic	Phase agreement of endogenous electromagnetic and photonic oscillations; the electrical state of the cellular environment.	Fröhlich; Popp; Sedlak; Levin	Ultra-weak photon emission (intensity, kinetics); membrane potential; tissue pH and redox state; bioimpedance	◌ Frontier The phenomena are measurable; their relationship to health outcomes is not yet established.

Evidence status refers to the level as used in the framework, not to the individual studies behind it. Detailed operational definitions, cut-offs and measurement protocols are documented in the Human Coherence Definitional Framework, available to researchers on request.

Four projections of one quantity

We hypothesize that the four levels are projections of a single organism-level quantity — order maintained against entropy — onto four planes of measurement, in the way that temperature and molecular kinetic energy describe one phenomenon at two scales. If the hypothesis holds, coherence measured at one level should predict change at the others, and a single Human Coherence Index can be estimated from their agreement. If it fails, the levels are independent and the framework reduces to four separate biomarker panels. Either result is publishable, and RP-1 is designed to find out which it is.

⚠ Working hypothesis

Three layers of control

Measurement tells you what is happening; a control model tells you where to act. The Institute's architecture describes the person as three coupled layers, each with its own time scale, its own characteristic failure and its own class of intervention. The layer names are deliberately neutral: they describe function, not anatomy.

The four measurement levels read different layers: K4 reads the Operator directly, K2 the Regulator, K3 and K1 the Executor. Because the layers are coupled in both directions, a persistent failure in one propagates to the others — which is why the framework predicts that an intervention aimed at a single layer will plateau. ⚠ Sequencing hypothesis

The sequencing hypothesis

Interventions ordered Operator → Regulator → Executor should outperform the same interventions in any other order, and single-layer interventions should show early gains followed by a plateau. Two known cascades motivate this prediction: chronic threat appraisal driving HPA dysregulation, a low-coherence heart rhythm and a persistent alarm signal to the hypothalamus (a self-sustaining loop); and stress-driven acceleration of epigenetic aging that reverses on recovery (Poganik et al., 2023). Both cascades begin at the top layer.

⚠ Working hypothesis tested in RP-3.

What the layers are not

The architecture is a control model, not a claim that the mind is software or the body a machine. Living tissue renews itself; a machine wears out. The layers are useful because they separate time scales and failure modes that clinical practice usually collapses into one word — "stress" — and because they turn the question of where to begin into a hypothesis that can be wrong.

Six dimensions of the Human Coherence Assessment

At the level of the person, coherence is screened with a 30-item self-report instrument covering six dimensions. The assessment is a research and screening tool, not a diagnostic one; its psychometric validation against physiological measures is part of RP-1.

Biological coherence

Energy, recovery, resilience of the body under load.

Psychological integration

Agreement between what a person believes, intends and does.

Emotional regulation

Proportionate response and recovery after emotional demand.

Chronobiological alignment

Regularity of sleep, light exposure and daily rhythm.

Metabolic coherence

Stability of energy supply; timing and quality of nutrition.

Environmental resonance

Whether the physical and social environment supports or taxes regulation.

Human Coherence and neighbouring constructs

Several established constructs describe parts of the same territory. The framework does not replace them; it specifies how they relate.

Construct	Origin	Scale	Primary measure	Relationship to Human Coherence
Heart (cardiac) coherence	HeartMath Institute; Tiller et al., 1996	Cardiovascular–autonomic	HRV coherence ratio near 0.1 Hz	The core measure of level K4 and the entry point of every Institute study.
Neurovisceral integration	Thayer & Lane, 2000	Brain–heart	Vagally mediated HRV	The mechanistic basis of K4; the reason HRV can stand in for prefrontal regulatory capacity.
Polyvagal state	Porges, 2007	Autonomic hierarchy	Respiratory sinus arrhythmia; behavioural state	Informs the Operator layer's autonomic component. Contested elements of the theory are treated as hypotheses.
Allostatic load	McEwen, 1998	Neuroendocrine–metabolic	Composite of ten or more biomarkers	Closely related to K2. Allostatic load is the cumulative cost of lost coherence.
Physiological complexity	Lipsitz & Goldberger, 1992	Signal dynamics	Fractal and entropy measures of HRV, gait, hormone pulses	The mathematical cousin of concordance; RP-1 estimates both and tests whether they converge.
Intrinsic capacity	World Health Organization	Functional	Locomotion, cognition, vitality, sensory and psychological capacity	The functional outcome that Human Coherence aims to predict and preserve.
Biofield coherence	Biofield-science tradition (Rubik et al., 2015); Coherence Wellness definition	Whole-system, including bioenergetic	Descriptive; no standard metric	Conceptual overlap with K1 and K4. Human Coherence adds operational metrics and an evidence tier for each claim.

How we label what we know

Trust in a new field depends on the discipline of its claims. Every statement the Institute publishes carries one of four labels, and frontier findings are never presented as established.

✓ Established

Replicated in peer-reviewed research by more than one group; measurement standards exist. Example: low HRV predicts mortality.

⚠ Working hypothesis

A specific, falsifiable prediction with a planned test and a pre-registered protocol. Example: the four levels are projections of one quantity.

◌ Frontier

A measurable phenomenon whose link to health outcomes is not yet established. Example: ultra-weak photon emission as a coherence marker.

✕ Not claimed What the Institute does not say

We do not claim that coherence practices cure disease. We do not claim that aging has been reversed in humans by any coherence intervention, or that immortality is a research outcome. We do not claim that frontier phenomena — biophoton emission, geomagnetic coupling — have proven clinical effects. We do not claim that a self-report assessment diagnoses anything. Where earlier public materials in our ecosystem have used the language of philosophy or aspiration, this site uses the language of measurement.

Research program

Five programs, sequenced from the most mature measurement to the most exploratory. Each has a defined question, a primary endpoint and a status. Protocols are pre-registered before data collection begins, and results are published whatever they show.

RP-1Metric development

The Human Coherence Index

Define, compute and validate a single index of coherence from the concordance of multiple physiological signals, and test whether the four levels of the framework behave as projections of one quantity or as independent panels.

Question: Does the agreement between heart rhythm, electrodermal activity, cortisol rhythm and circadian markers carry information that no single marker carries?
Design: Secondary analysis of existing multi-signal datasets, then a 200-participant cross-sectional study with 14 days of continuous wearable recording and one laboratory session.
Methods: Periodically correlated (cyclostationary) time-series models for rhythmic physiology; dynamic correlation structure rather than means or minima; comparison with fractal and entropy measures of complexity; psychometric validation of the 30-item assessment against physiological measures.
Output: Methods paper; open-source analysis code; reference ranges by age and sex.

StatusProtocol in preparation. Seeking methodological collaborators and holders of multi-signal datasets.

RP-2Observational cohort

Coherence trajectories and the pace of aging

Follow a cohort for 24 months and ask whether a person's coherence trajectory predicts how fast they are aging, beyond conventional risk factors.

Question: Does the Human Coherence Index at baseline, and its change over time, predict DunedinPACE and epigenetic-age acceleration?
Design: Prospective observational cohort, target n = 300; nightly RMSSD and sleep from consumer wearables; quarterly laboratory panel (HOMA-IR, hs-CRP, diurnal cortisol); DNA methylation at months 0, 12 and 24.
Endpoints: Primary: DunedinPACE at 24 months. Secondary: epigenetic-age acceleration, allostatic-load composite, intrinsic-capacity measures.
Output: Cohort paper; de-identified open dataset; norms for coherence by age.

StatusDesign complete. Ethics submission planned. Seeking funding for laboratory and methylation assays.

RP-3Randomized trial

A 21-day coherence practice

Test, under randomized and pre-registered conditions, whether a brief daily practice sequence changes resting coherence — and whether the order of intervention matters, as the sequencing hypothesis predicts.

Question: Does 21 days of resonance-frequency breathing with heart-focused positive-emotion practice, combined with light and sleep timing, raise resting RMSSD and coherence ratio relative to a waitlist control?
Design: Randomized, waitlist-controlled, three arms (practice; practice in reversed layer order; waitlist), target n = 150; primary outcome resting RMSSD at day 21; secondary outcomes coherence ratio, electrodermal tone, cortisol awakening response, sleep efficiency, perceived stress.
Exploratory: HRV–EDA concordance as an early signal of change; dose–response by minutes of practice.
Output: Trial report following CONSORT; open protocol and materials so the practice can be replicated by any laboratory.

StatusProtocol drafting. Pre-registration on the Open Science Framework before enrolment.

RP-4Multi-signal concordance

Agreement between signals as the unit of measurement

Extend concordance measurement beyond heart rhythm and electrodermal activity to skin temperature, respiration and actigraphy, and from one person to two — measuring whether the physiology of two people in interaction synchronizes.

Question: Which combinations of signals, sampled at which rates, carry the most information about regulatory state — and can dyadic synchrony be measured reliably outside the laboratory?
Design: Exploratory laboratory sessions with simultaneous multi-signal recording; methods work in dialogue with the SWR DO adaptive-feedback framework developed in the Polish bioelectronics tradition.
Output: Measurement protocol; recommendations for wearable selection; dyadic-synchrony pilot data.

StatusExploratory. Collaboration in development.

RP-5Frontier measurement

Ultra-weak photon emission and coherence states

Ultra-weak photon emission from living tissue is a measurable phenomenon, imaged in recent work in living and dying animals. Whether its intensity or kinetics track coherence states in humans is unknown. RP-5 asks that question and nothing more.

Question: Do photon-emission parameters differ between high- and low-coherence states in the same person, under controlled conditions?
Design: Laboratory collaboration with a biophysics group holding the required detectors; strictly exploratory; no health claims will be derived from the results.
Output: Feasibility report. If the phenomenon does not track coherence, the framework's level K1 will be revised or removed.

StatusSeeking a laboratory partner. Not funded.

Methods and open-science commitments

These commitments apply to every Institute study and are binding on any partner who collects data under the Institute's name.

Pre-registration

Hypotheses, primary endpoints and analysis plans are registered on the Open Science Framework before enrolment. Deviations are reported as such.

Ethics review

Every study with human participants is reviewed by an independent institutional review board and follows the Declaration of Helsinki. Participation is voluntary and withdrawal is unconditional.

HRV reporting standards

Recording, artefact handling and reporting follow the 1996 Task Force standards and the psychophysiology publication guidelines (Laborde et al., 2017; Quigley et al., 2024). Resting-state metrics (RMSSD, HF power) and state-coherence metrics (coherence ratio, LF power) are reported separately, because they answer different questions and can move in opposite directions during coherent states.

Reporting guidelines

Trials follow CONSORT; observational studies follow STROBE. Effect sizes with confidence intervals are reported alongside significance tests.

Open data and code

De-identified datasets and analysis code are released with each publication, under licences that permit re-analysis. Where consent limits sharing, the limitation is stated.

Publication regardless of result

Null and negative results are published. No funder, partner or affiliated entity holds a right of review, veto or delay over the Institute's findings.

Conflict-of-interest disclosure

Financial relationships between Institute researchers and any organization offering coherence-related products or services are disclosed in every publication and on this site.

Data protection

Data are collected to the minimum necessary, de-identified at source where possible, encrypted in transit and at rest, and never sold or shared for commercial purposes.

Evidence library

The published research the framework rests on, organized by theme. Entries are cited in the text above by first author and year. Digital object identifiers are given where available; the library is reviewed quarterly and additions are welcome.

Tsuji H, Venditti FJ, Manders ES, et al. Reduced heart rate variability and mortality risk in an elderly cohort: the Framingham Heart Study. Circulation. 1994;90(2):878–883. doi:10.1161/01.CIR.90.2.878HRV and health
Tsuji H, Larson MG, Venditti FJ, et al. Impact of reduced heart rate variability on risk for cardiac events: the Framingham Heart Study. Circulation. 1996;94(11):2850–2855. doi:10.1161/01.CIR.94.11.2850HRV and health
Dekker JM, Crow RS, Folsom AR, et al. Low heart rate variability in a 2-minute rhythm strip predicts risk of coronary heart disease and mortality from several causes: the ARIC Study. Circulation. 2000;102(11):1239–1244. doi:10.1161/01.CIR.102.11.1239HRV and health
Jarczok MN, Weimer K, Braun C, et al. Heart rate variability in the prediction of mortality: a systematic review and meta-analysis of healthy and patient populations. Neuroscience & Biobehavioral Reviews. 2022;143:104907. doi:10.1016/j.neubiorev.2022.104907HRV and health
Umetani K, Singer DH, McCraty R, Atkinson M. Twenty-four hour time domain heart rate variability and heart rate: relations to age and gender over nine decades. Journal of the American College of Cardiology. 1998;31(3):593–601. doi:10.1016/S0735-1097(97)00554-8HRV and aging
Zulfiqar U, Jurivich DA, Gao W, Singer DH. Relation of high heart rate variability to healthy longevity. American Journal of Cardiology. 2010;105(8):1181–1185. doi:10.1016/j.amjcard.2009.12.022HRV and aging
Kemp AH, Quintana DS. The relationship between mental and physical health: insights from the study of heart rate variability. International Journal of Psychophysiology. 2013;89(3):288–296. doi:10.1016/j.ijpsycho.2013.06.018HRV and health
Shaffer F, Ginsberg JP. An overview of heart rate variability metrics and norms. Frontiers in Public Health. 2017;5:258. doi:10.3389/fpubh.2017.00258HRV metrics
Shaffer F, McCraty R, Zerr CL. A healthy heart is not a metronome: an integrative review of the heart's anatomy and heart rate variability. Frontiers in Psychology. 2014;5:1040. doi:10.3389/fpsyg.2014.01040HRV
McCraty R, Shaffer F. Heart rate variability: new perspectives on physiological mechanisms, assessment of self-regulatory capacity, and health risk. Global Advances in Health and Medicine. 2015;4(1):46–61. doi:10.7453/gahmj.2014.073HRV
McCraty R, Atkinson M, Tiller WA, Rein G, Watkins AD. The effects of emotions on short-term power spectrum analysis of heart rate variability. American Journal of Cardiology. 1995;76(14):1089–1093. doi:10.1016/S0002-9149(99)80309-9Coherence
Tiller WA, McCraty R, Atkinson M. Cardiac coherence: a new, noninvasive measure of autonomic nervous system order. Alternative Therapies in Health and Medicine. 1996;2(1):52–65.Coherence
McCraty R, Barrios-Choplin B, Rozman D, Atkinson M, Watkins AD. The impact of a new emotional self-management program on stress, emotions, heart rate variability, DHEA and cortisol. Integrative Physiological and Behavioral Science. 1998;33(2):151–170. doi:10.1007/BF02688660Coherence
McCraty R, Atkinson M, Tomasino D. Impact of a workplace stress reduction program on blood pressure and emotional health in hypertensive employees. Journal of Alternative and Complementary Medicine. 2003;9(3):355–369. doi:10.1089/107555303765551589Coherence
Vaschillo EG, Vaschillo B, Lehrer PM. Characteristics of resonance in heart rate variability stimulated by biofeedback. Applied Psychophysiology and Biofeedback. 2006;31(2):129–142. doi:10.1007/s10484-006-9009-3Biofeedback
McCraty R, Atkinson M, Tomasino D, Bradley RT. The coherent heart: heart–brain interactions, psychophysiological coherence, and the emergence of system-wide order. Integral Review. 2009;5(2):10–115.Coherence
McCraty R, Childre D. Coherence: bridging personal, social, and global health. Alternative Therapies in Health and Medicine. 2010;16(4):10–24.Coherence
Ginsberg JP, Berry ME, Powell DA. Cardiac coherence and posttraumatic stress disorder in combat veterans. Alternative Therapies in Health and Medicine. 2010;16(4):52–60.Coherence
Bradley RT, McCraty R, Atkinson M, Tomasino D, Daugherty A, Arguelles L. Emotion self-regulation, psychophysiological coherence, and test anxiety: results from an experiment using electrophysiological measures. Applied Psychophysiology and Biofeedback. 2010;35(4):261–283. doi:10.1007/s10484-010-9134-xCoherence
MacKinnon S, Gevirtz R, McCraty R, Brown M. Utilizing heartbeat evoked potentials to identify cardiac regulation of vagal afferents during emotion and resonant breathing. Applied Psychophysiology and Biofeedback. 2013;38(4):241–255. doi:10.1007/s10484-013-9226-5Coherence
Lehrer PM, Gevirtz R. Heart rate variability biofeedback: how and why does it work? Frontiers in Psychology. 2014;5:756. doi:10.3389/fpsyg.2014.00756Biofeedback
McCraty R, Zayas MA. Cardiac coherence, self-regulation, autonomic stability, and psychosocial well-being. Frontiers in Psychology. 2014;5:1090. doi:10.3389/fpsyg.2014.01090Coherence
McCraty R. Science of the Heart, Volume 2: Exploring the Role of the Heart in Human Performance. Boulder Creek, CA: HeartMath Institute; 2015.Coherence
Goessl VC, Curtiss JE, Hofmann SG. The effect of heart rate variability biofeedback training on stress and anxiety: a meta-analysis. Psychological Medicine. 2017;47(15):2578–2586. doi:10.1017/S0033291717001003Biofeedback
Lehrer P, Kaur K, Sharma A, et al. Heart rate variability biofeedback improves emotional and physical health and performance: a systematic review and meta analysis. Applied Psychophysiology and Biofeedback. 2020;45(3):109–129. doi:10.1007/s10484-020-09466-zBiofeedback
Shaffer F, Meehan ZM. A practical guide to resonance frequency assessment for heart rate variability biofeedback. Frontiers in Neuroscience. 2020;14:570400. doi:10.3389/fnins.2020.570400Biofeedback
Yoo HJ, Nashiro K, Min J, et al. Heart rate variability (HRV) changes and cortical volume changes in a randomized trial of five weeks of daily HRV biofeedback in younger and older adults. International Journal of Psychophysiology. 2022;181:50–63.Biofeedback
Laborde S, Allen MS, Borges U, et al. Effects of voluntary slow breathing on heart rate and heart rate variability: a systematic review and a meta-analysis. Neuroscience & Biobehavioral Reviews. 2022;138:104711.Biofeedback
McCraty R. Following the rhythm of the heart: HeartMath Institute's path to HRV biofeedback. Applied Psychophysiology and Biofeedback. 2022;47(4):305–316.Coherence
Min J, Rouanet J, Martini AC, et al. Modulating heart rate oscillation affects plasma amyloid beta and tau levels in younger and older adults. Scientific Reports. 2023;13:3967.Biofeedback
Nashiro K, Min J, Yoo HJ, et al. Increasing coordination and responsivity of emotion-related brain regions with a heart rate variability biofeedback randomized trial. Cognitive, Affective, & Behavioral Neuroscience. 2023;23(1):66–83.Biofeedback
Balaji S, Plonka N, Atkinson M, Muthu M, Ragulskis M, Vainoras A, McCraty R. Heart rate variability biofeedback in a global study of the most common coherence frequencies and the impact of emotional states. Scientific Reports. 2025;15:3241. doi:10.1038/s41598-025-87729-7Coherence
Elbers J, McCraty R. From dysregulation to coherence: exploring the HeartMath approach to emotional and physiological regulation. Global Advances in Integrative Medicine and Health. 2025. doi:10.1177/27536130251408821Coherence
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Reference details are checked against publisher records. If you find an error, or a study the library should include, write to the Institute with the citation and DOI.

The Institute

BioMastering Institute exists to establish Human Coherence as a rigorous, measurable scientific construct, and to make the knowledge of how coherence is lost and restored freely available. It is a research and education organization, not a clinic and not a vendor.

Mission

To advance the scientific understanding of Human Coherence — its definition, measurement, loss and restoration — through open research, and to translate that understanding into education that any person can use.

What we do

Research. We design and run the five programs above, alone and with academic partners, and publish the results.

Education. We maintain this evidence library, a glossary of coherence science, and free educational material for the public, clinicians and researchers.

Standards. We publish operational definitions, measurement protocols and reference ranges so that coherence can be measured the same way in any laboratory.

Community science. We invite volunteers to contribute data to Institute studies under ethics review and informed consent, and we return the results to them.

Origin

The Institute grew out of one question that would not go away: if cells constantly renew themselves, why does the organism still age? Pursuing that question through physiology, cybernetics, neuroscience and the biology of regeneration led to a hypothesis — that what is lost with age is not capacity but coordination — and to the conviction that the hypothesis deserved to be tested properly rather than asserted.

The Institute is the research and education arm of a wider ecosystem. Educational programs and community activities are offered by separate entities; the Institute's science stands on its own and is answerable only to its evidence.

Where we present

The framework was presented to the longevity community at RAADfest 2026 (Scottsdale, Arizona, September 4–6) and in the People Unlimited Ageless Education series. Dr. Knapik's book Live Long to Live Forever, which sets out the architecture in full, is published in autumn 2026.

Leadership

Dr. Oskar Knapik

Founder and Director of Research

Psychobiocybernetician and quantitative scientist. PhD from CREATES, Aarhus University, with an institutional background in quantitative research at UBS, Danske Bank and Citi, and published work on periodically correlated time-series methodology — the statistical foundation of the Institute's approach to rhythmic physiology. Eight years directing the Dhanvantari Institute for Psychobiological Regeneration and more than 3,000 hours of integrative health consultation. Originator of the three-layer architecture and author of Live Long to Live Forever.

Anna Ziarkowska

Co-Founder

Co-leads the Institute with Dr. Knapik and directs its educational mission and research-participant community — the volunteers whose measurements make longitudinal coherence research possible.

Scientific Advisory Board — in formation

The Institute is assembling an independent Scientific Advisory Board across psychophysiology, chronobiology, epigenetics and geroscience, biostatistics and time-series methodology, and bioelectronics. Members will be listed here with affiliations and conflict-of-interest statements, and will review every protocol before pre-registration. Researchers interested in serving are invited to write to the Institute.

Governance and independence

Legal form

A nonprofit corporation formed in the United States. An application for recognition as a tax-exempt public charity under Section 501(c)(3) is in progress; the determination letter and employer identification number will be published here on receipt.

Board of directors

The board will hold a majority of independent members — directors with no financial interest in any entity offering coherence-related programs or products — as a condition of the Institute's research independence.

Separation from commercial activity

The Institute does not sell products, programs or services. Educational programs marketed under the BioMastering name are operated by separate entities. Any licensing, service or support arrangement between the Institute and an affiliated entity is made at arm's length, approved by independent directors and disclosed in the annual report.

Research independence

No funder, partner or affiliated entity holds a right to review, amend, delay or suppress the Institute's findings. Results are published whatever they show.

Transparency

The Institute will publish its bylaws, conflict-of-interest policy, IRS determination, annual information returns (Form 990) and an annual research report on this page.

Trademarks

BioMastering™ and Human Coherence™ are trademarks used under licence to identify the Institute's work. Trademark ownership does not confer any influence over research design, analysis or publication.

Fund the science of Human Coherence

The Institute's research is funded by its founders, by individual donors and, as the program matures, by research grants and institutional partners. Every dollar is assigned to a study, and every study reports back.

Sponsor a participant

One year of data

Covers wearable recording, a quarterly laboratory panel and one DNA-methylation assay for one participant in the coherence-and-aging cohort (RP-2).

Sponsor a participant

Fund a study

One program

Funds a complete pre-registered study — RP-1, RP-3 or RP-4 — from ethics review to open publication, with the funder acknowledged in the paper.

Fund a study

Give monthly

Sustaining support

Recurring gifts keep the evidence library, glossary and educational material free and maintained, and allow studies to be planned across years.

Give monthly

Partner in kind

Devices, assays, data

Wearable manufacturers, laboratories and holders of multi-signal datasets can contribute equipment, assays or de-identified data to a named study.

Propose a partnership

Recognition of the Institute as a tax-exempt public charity under Section 501(c)(3) is pending. Until the Internal Revenue Service issues its determination, gifts are not confirmed as tax-deductible; when recognition is granted it may apply retroactively to the date of incorporation. Donors will be notified and this notice updated. Please consult your tax adviser. A public crowdfunding campaign for RP-2 and RP-3 will be announced on this page.

For grant-makers and institutional partners

The Institute offers what a funder of early-stage science needs to see: a construct with a formal definition and an explicit evidence tier for every claim; five research programs with stated questions, endpoints and designs; a commitment to pre-registration, open data and publication regardless of result; quantitative expertise in the time-series methods that rhythmic physiology requires; and an access route to a motivated community of research volunteers. A research prospectus with budgets and timelines is available on request.

Request the research prospectus

For researchers

The Institute welcomes collaboration on any of the five programs, secondary analysis of existing datasets, replication of the 21-day practice protocol, and critique of the framework itself. The Human Coherence Definitional Framework — operational definitions, measurement protocols and cut-offs — is shared with researchers on request, and the Research Fellowship provides a formal structure for sustained collaboration.

Propose a collaboration

Questions researchers, funders and readers ask

Is Human Coherence a proven scientific construct?

Partly. The measurements it uses — heart-rate variability, electrodermal activity, cortisol rhythms, epigenetic clocks — are established, and the associations between them and health outcomes are well replicated. The claim that they are projections of a single quantity, and that agreement between them carries information no single marker carries, is a working hypothesis. The purpose of the Institute is to test it.

Is the Institute affiliated with the HeartMath Institute?

No. BioMastering Institute is an independent organization. It cites the HeartMath Institute's research because it is part of the scientific record on physiological coherence, and it builds on that record openly and with attribution. HeartMath® is a registered trademark of HeartMath, Inc.

Is coherence the same as relaxation?

No. Relaxation lowers arousal. Coherence organizes rhythm: a coherent heart rhythm is a stable, high-amplitude oscillation in which breathing, blood pressure and heart rate lock together, typically near 0.1 Hz. A person can be relaxed and incoherent, or alert and coherent. This is also why time-domain HRV measures such as RMSSD can fall during a highly coherent state even as low-frequency power rises — the two metrics answer different questions, and the Institute reports them separately.

Does the Institute sell anything?

No. The Institute is a nonprofit research and education organization and sells no products, programs or services. Educational programs under the BioMastering name are offered by separate entities, and any arrangement between them and the Institute is disclosed in the annual report.

Can I take part in a study?

Yes. Each study enrols volunteers under ethics review and informed consent, with clear eligibility criteria. Register your interest through the contact form and you will be notified when enrolment for a study opens. Participation is voluntary, unpaid unless stated otherwise, and can be withdrawn at any time without reason.

What is the relationship to "Live Forever"?

The Institute's research question is coherence and the pace of aging. The Live Forever movement, which shares founders with the Institute, is a philosophical and community initiative; its language is aspirational. The Institute makes no claims about immortality and none of its studies has immortality as an endpoint.

Why include a "frontier" level at all?

Because ultra-weak photon emission from living tissue is a real, measurable phenomenon with a research literature going back to the 1980s, and because the honest response to an open question is to state it as open. Level K1 is labelled frontier, is isolated in its own research program, and will be revised or removed if the phenomenon does not track coherence states.

How is the Institute funded?

Initially by its founders and by individual donors. Research grants and institutional partnerships are being pursued for the cohort and trial programs. The Institute publishes its funding sources annually, and no funder holds any right over its findings.

Glossary of coherence science

Terms used on this site, defined the way the Institute uses them.

Coherence (physics): A stable relationship in phase and frequency between oscillations, or within one oscillation over time.
Autocoherence: Order within a single rhythm: the stability of its frequency, amplitude and waveform.
Cross-coherence: Entrainment between two or more rhythms, such as respiration, blood pressure and heart rhythm operating at one frequency.
Physiological (heart) coherence: A state in which the heart rhythm becomes a stable, sine-wave-like oscillation, typically near 0.1 Hz, with a narrow high-amplitude peak in the low-frequency band of the HRV spectrum; introduced by the HeartMath Institute.
Coherence ratio: The power of the dominant peak in the 0.04–0.26 Hz range relative to the remaining power of the HRV spectrum; the standard quantitative measure of heart coherence.
Resonance frequency: The breathing rate, usually between 4.5 and 6.5 breaths per minute, at which heart-rate oscillations reach maximum amplitude because breathing and the baroreflex reinforce one another.
Heart-rate variability (HRV): Variation in the time between heartbeats. High resting HRV indicates a flexible, well-regulated autonomic nervous system.
RMSSD: Root mean square of successive differences between heartbeats; the standard time-domain index of vagally mediated HRV at rest.
Electrodermal activity (EDA): Changes in skin conductance driven by sweat-gland activity, which is innervated only by the sympathetic branch — making EDA a direct index of arousal, independent of vagal tone.
Concordance: The degree of dynamic agreement between two or more physiological signals over time; in the framework, the unit of measurement of coherence.
Human Coherence: The degree to which the components and subsystems of a person are dynamically coordinated — synchronized, mutually informative, adaptively co-regulated — so that the organism operates as an integrated, self-maintaining, self-correcting whole.
Human Coherence Index: The composite metric under development in RP-1, estimated from the concordance of signals across the four measurement levels.
Allostatic load: The cumulative physiological cost of adapting to stress, measured as a composite of neuroendocrine, metabolic and cardiovascular markers.
Intrinsic capacity: The World Health Organization's term for the composite of a person's physical and mental capacities; its age-related decline is coded MG2A in ICD-11.
Epigenetic clock: An estimator of biological age from DNA-methylation patterns at defined sites in the genome.
DunedinPACE: A DNA-methylation measure of the pace of aging — how many years of biological change occur per calendar year — derived from a longitudinal birth cohort.
Set-point drift: The gradual shift of a regulatory target — for example, the threshold at which the hypothalamus responds to feedback — such that the system regulates to the wrong value.
Periodically correlated time series: A class of statistical models for processes whose mean and covariance repeat with a fixed period; the Institute's method for analysing physiology with daily, weekly and seasonal cycles.
Ultra-weak photon emission: Spontaneous emission of very low-intensity light by living tissue, measurable with photon-counting detectors; a frontier measurement in the framework.
Negentropy: Order maintained by a living system against the tendency toward disorder; the hypothesized single quantity of which the four coherence levels are projections.

Contact the Institute

For research collaboration, advisory-board enquiries, funding, data partnerships, media and study participation.

General and research enquiriesjourney@biomastering.com
Director of ResearchDr. Oskar Knapik · oskar.knapik@biomastering.com
Webbiomastering.institute · livelongtoliveforever.com

Research updates

A short bulletin when a protocol is pre-registered, a study opens for enrolment, or a result is published. Nothing else.