HeartMath coherence training (claims contested)

1. Introduction

Version followed: the HeartMath LLC technique handouts and worksheets (marked "© 2008, 2017 HeartMath LLC") for Quick Coherence, Heart Lock-In, Freeze Frame and Attitude Breathing; HeartMath's HeartCloud library page for Quick Coherence; an Inner-Ease description from a HeartMath-related newsletter; and the HeartMath Clinical Certification as a third-party course listing describes it. HeartMath's own certification and research pages are not covered here [uncertain: not verified]. [source: HeartMath handouts; HeartCloud; FNNR listing]

HeartMath coherence training is a proprietary self-regulation system, not a school of psychotherapy. It comes from the HeartMath Institute, a non-profit founded by Doc Childre in 1991 in Boulder Creek, California, with Rollin McCraty as director of research. Its commercial side is HeartMath LLC, and the HeartMath trademark belongs to Quantum Intech, Inc. [source: Psi Encyclopedia; HeartMath handouts] The core technique pairs slow breathing with attention on the heart area and the deliberate recall of a "regenerative" feeling such as appreciation or care. HeartMath calls the resulting state "coherence": a smooth, regular heart-rhythm pattern in which, according to HeartMath, the autonomic, hormonal and immune systems work in sync instead of against each other. [source: HeartCloud; Impact of Stress handout] HeartMath's model of change is that how you feel about an event, more than the event itself, decides whether it is stressful. Repeated short shifts into coherence are meant to interrupt stress reactions, and longer practice is said to "lock in" new emotional patterns. [source: Impact of Stress handout; Heart Lock-In handout] Practice can be done without equipment, or with HeartMath's heart-rhythm feedback devices (emWave, Inner Balance). The device-based form is a type of heart rate variability (HRV) biofeedback; see 040 HRV biofeedback for the general method, BCIA certification and evidence.

Contested claims: what is claimed, by whom, and how independent sources rate it.

Physiological layer (mainstream). HRV is a recognised measure of autonomic regulation, and slow breathing with relaxation is an accepted stress-management tool. Even a strong critic calls HRV "an important concept" and says the Quick Coherence technique "made me feel really good" (Scott Alexander, 2014). [source: Slate Star Codex] What critics dispute is the "coherence" label and HeartMath's own branded metrics, not slow breathing itself.
Heart-field and interpersonal claims (contested). HeartMath's research director, McCraty, is quoted as saying that the heart radiates a measurable magnetic field that other people's nervous systems can detect, and HeartMath material says the heart's field carries information "not bound by the classical limits of time and space". [source: Coyne 2015, quoting HeartMath] Critics answer that the heart's field is real but tiny. It was measured only in shielded laboratories, so it gives no evidence of effects on people nearby (Alexander 2014). Coyne (2015) argues that the claims lack a plausible mechanism and independent peer review. [source: Slate Star Codex; Seattle Star]
"Heart intelligence" and intuition claims (contested). HeartMath is quoted as claiming that "the heart receives intuitive information before the brain" and that the body responds to future events before they happen. These rest on HeartMath presentiment studies: a 2004 study of heart-rate changes before emotional images, a 2007 study of entrepreneurs, and a 2011 training follow-up. [source: Coyne 2015; Psi Encyclopedia] The Society for Psychical Research's encyclopedia, a parapsychology source, reports these studies but no independent replication. Critics treat them as unsupported speculation. Alexander (2014) adds that the heart's small intrinsic nervous system (tens of thousands of neurons) does not amount to a "second brain". [source: Psi Encyclopedia; Slate Star Codex]
Global Coherence Initiative (contested). This HeartMath hypothesis holds that the Earth's magnetic field carries biologically relevant information and that group compassion practice could make a "global field" more coherent. Independent commentators deride it. [source: Psi Encyclopedia; Coyne 2015; Alexander 2014]
Clinical and organisational outcomes (limited, mostly developer-linked). The US federal evidence registry NREPP reviewed one HeartMath programme, coherence training for children with ADHD. It rested on one randomised wait-list study reported by the same team, with an overall quality rating of 3.0 and 2.8 out of 4, a small sample, no power analysis, possible confounds and weak fidelity (2.0). [source: NREPP] An uncontrolled six-person study of Quick Coherence (Edwards 2016) found more device-measured coherence and better feeling states, and its author warns that little weight can be placed on the statistics. [source: Edwards 2016] Coyne (2015) disputes HeartMath's workplace cost-saving figures as not independently peer reviewed. No NICE guidance specific to HeartMath was found. [uncertain]
Practical stance for the therapist. Present HeartMath to clients as a breathing-and-emotion-regulation skill with modest, mainly developer-generated evidence. Do not present the heart-field, intuition or global-coherence ideas as established fact. [synthesis]

2. Framework

HeartMath publishes techniques, home-practice logs and certified-practitioner protocols. The cited sources do not set out a fixed phase model for psychotherapy, so the phases below arrange the published elements into a clinical course. The ordering is [synthesis]; the content of each phase is sourced.

Who delivers it, and certification. The HeartMath Clinical Certification ("HeartMath Certified Practitioner") is open to licensed or certified health professionals who work with clients on physical or mental health. Students in formal health training and people working under supervision are also eligible. The course consists of six one-hour recorded classes and a course manual with scripts, case examples, clinical forms and patient handouts. It covers six HeartMath techniques, the role of coherence in health, individual and group protocols, and HRV applications listed as anxiety, pain, PTSD, sleep and ADHD. Certification requires an exam. The course carries 20 CE credits for mental health professionals and 7 BCIA-approved hours toward BCIA recertification. Listing in the HeartMath Provider Directory is at HeartMath LLC's discretion. [source: FNNR listing] These figures come from a third-party sales page, so check current terms with HeartMath. [uncertain: secondary] HeartMath certification is a vendor credential, separate from BCIA board certification in biofeedback (see 040). In the ADHD programme reviewed by NREPP, educators, clinicians or parents could deliver the intervention, and a two-day training was optional. [source: NREPP] HeartMath also runs coach, trainer and organisational programmes such as "The Resilience Advantage". Their requirements are not verified here [uncertain: not verified].

Phases [synthesis ordering]:

Assessment and fit (session 1). Goals: identify the target problem (stress reactivity, anxiety, anger, sleep, performance), any medical issues that affect breathing or heart-rhythm readings, trauma history, and the client's view of mind-body work. Give an informed-consent explanation that separates the skill from the contested claims (section 1). Moving on: the client agrees to a short trial and to home practice. [synthesis]
Psychoeducation and Quick Coherence (sessions 1–2). Teach the stress–emotion model and Quick Coherence in session, with or without a heart-rhythm display. Home practice in HeartMath's own handout: Quick Coherence four or five times a day, every day, for at least three weeks, for example on waking, at midday and before bed. [source: Impact of Stress handout] Moving on: the client can produce the shift on request and reports using it between sessions.
Sustained practice: Heart Lock-In (about sessions 2–4). Heart Lock-In is practised for five minutes or more, a couple of times a day, in a quiet place. HeartMath presents it as building emotional resilience. [source: Heart Lock-In handout] Moving on: the client can hold the feeling for several minutes and logs practice.
Applied, in-the-moment techniques (about sessions 3–8). Freeze Frame is used for problems and conflicts, Attitude Breathing for draining attitudes, and Inner-Ease for staying even during challenges. Each has a practice log. [source: Freeze Frame and Attitude Breathing handouts; Inner-Ease page] Moving on: the client records real triggers handled with a technique.
Generalisation and ending (final 1–2 sessions). Use shortened "quick steps" before and during challenging situations, cut down device use, and plan relapse prevention. [source: Impact of Stress handout, quick-version guidance; synthesis]

Session count and format. In the NREPP-reviewed ADHD programme a course usually ran 6–12 sessions, with device-based coherence games. [source: NREPP] The clinical certification teaches both individual and group protocols. [source: FNNR listing] A typical session might run: review practice logs, guided technique practice with optional feedback, applying the technique to a current problem, and setting home practice. [synthesis] HeartMath can also be added as one component of a broader therapy, such as CBT for anxiety. [synthesis]

3. Guiding principles

Feelings, not events, drive the stress response. Work on the client's emotional response to a situation, not only the situation itself. [source: Impact of Stress handout]
Sincerity of feeling matters more than technique. Coach the client to genuinely re-experience care or appreciation, not to think about it. [source: HeartCloud; Freeze Frame handout]
Breathe at a comfortable pace, never a forced one. The handouts suggest a slow rhythm of about five seconds in and five out, or any comfortable rhythm. Never push a count that causes strain. [source: Freeze Frame, Attitude Breathing handouts]
Short and often beats long and rare. Brief practice several times a day builds the habit. [source: Impact of Stress handout]
Practise first when calm, then use it under stress. Learn the full steps in calm conditions, then use the quick version during challenges. [source: Impact of Stress handout; Freeze Frame handout]
Neutral is a valid fallback. If no positive feeling is available, a neutral or calm feeling still stops the energy drain. [source: Attitude Breathing handout; HeartCloud]
Act on the insight. Shifts in perception are followed by a commitment to new behaviour. [source: Freeze Frame handout; Inner-Ease page]
Track practice. Practice logs record situations, responses and observations so progress can be seen. [source: practice logs in the handouts]
Keep the claims and the skill separate. Teach the skill without endorsing contested claims about the heart field or intuition, and say so when you obtain consent. [synthesis]
The device is a training aid, not the goal. A high coherence score is a means to self-regulation; generalise the skill away from the screen. [synthesis; see 040]
Validate before you shift. Acknowledge the client's emotion first (Freeze Frame's first step). The aim is regulation, not suppressing justified feelings. [source: Freeze Frame handout; synthesis]

4. Intervention inventory

The steps below paraphrase HeartMath's published handouts. HeartMath's worksheets and scripts are copyrighted, so use the official versions with clients. Therapist wording is illustrative throughout.

4.1 Assessment and informed consent

Purpose / when: At intake, to check fit and safety and to separate the evidence-based skill from the contested claims. [synthesis]
Steps:
1. Define the target problem and a simple outcome you will track, such as a weekly 0–10 rating of stress reactivity or a validated anxiety measure you already use. [synthesis]
2. Screen for medical issues that affect breathing or heart rhythm: arrhythmia, pacemaker, heart or lung disease, pregnancy, medicines that affect heart rate. Ask the client to check with their physician if any apply, because these can distort heart-rhythm feedback and affect slow-breathing tolerance. [synthesis; see 040]
3. Screen for trauma, panic sensitivity to body sensations, and dissociation. Paying attention to the chest can be a trigger. [synthesis]
4. Explain what HeartMath is (section 1). Name the evidence status plainly and invite questions. Record consent. [synthesis]
Example language (illustrative): "This is a breathing and feeling skill developed by the HeartMath Institute. Slow breathing and calming emotions have a sensible basis. Some of HeartMath's wider ideas, like the heart sending out a field other people pick up, are disputed, and I won't be asking you to believe them."
Watch for: Clients attracted mainly by the metaphysical claims, health conditions that need medical clearance, and expectations that the device "fixes" stress. [synthesis]

4.2 Psychoeducation: stress and the basics of coherence

Purpose / when: First session, to give a rationale for practice. [source: Impact of Stress handout]
Steps:
1. Explain stress as everyday wear and tear. HeartMath stresses that daily hassles can do more damage than major events. [source: Impact of Stress handout]
2. Explain that how a person feels about an event shapes the stress response. [source: Impact of Stress handout]
3. Describe HeartMath's contrast: depleting emotions (anger, frustration, anxiety, worry) are linked with irregular heart rhythms, and renewing emotions (appreciation, care) with smooth, ordered rhythms. Coherence is HeartMath's term for the ordered state. [source: Impact of Stress handout; HeartCloud]
4. The handout includes a short self-check of common stress signs, such as fatigue, nervousness, sleep problems, aches and worry. Use the official handout or your own measures. [source: Impact of Stress handout]
5. Frame health links cautiously. The handout lists stress-related conditions, but do not imply that the technique treats heart disease or other illnesses. [synthesis]
Example language (illustrative): "When you're frustrated, your heart rate tends to jump around unevenly. When you feel calm appreciation, it often rises and falls in a smoother wave with your breathing. We're going to practise moving towards that smoother state on purpose."
Watch for: Over-literal acceptance of the health claims, and clients who hear the model as blaming them for their stress. [synthesis]

4.3 Heart-Focused Breathing (the base step)

Purpose / when: The first step of every HeartMath technique, also used alone as a quick reset. [source: HeartCloud; all handouts]
Steps:
1. Bring attention to the area of the heart or centre of the chest.
2. Imagine the breath flowing in and out through that area.
3. Breathe a little slower and deeper than usual, at a comfortable rhythm. The handouts suggest about five seconds in and five out, adjusted to comfort. [source: HeartCloud; Freeze Frame handout]
Example language (illustrative): "Let your attention settle in the middle of your chest. Imagine the breath moving in and out right there, a little slower than usual, at whatever pace feels easy."
Watch for: Light-headedness or tingling, which suggests overbreathing: slow down and breathe more gently, not more deeply. Also watch for chest-focus triggering panic or trauma memories; offer attention on the breath at the belly or nostrils, or eyes open. [synthesis]

4.4 Quick Coherence technique

Purpose / when: HeartMath's core one-minute technique for rebalancing, energy, or before and during a challenging situation. [source: HeartCloud; Impact of Stress handout]
Steps:
1. Heart-Focused Breathing (4.3).
2. Activate a renewing feeling. Make a sincere attempt to feel "appreciation or care" for someone or something: a loved one, a pet, a special place, an accomplishment. Or simply focus on a feeling of calm or ease. [source: HeartCloud]
3. Once both steps are familiar, use them as a quick version in the moment. [source: Impact of Stress handout]
4. Home practice per the handout: four or five times a day for at least three weeks. [source: Impact of Stress handout]
Example language (illustrative): "Keep that easy breathing. Now bring to mind someone or something you genuinely appreciate. Don't just picture it, see if you can feel some of that warmth again. If nothing comes, just let the breath carry a sense of calm."
Watch for: The client describing a felt shift such as warmth, settling or softening rather than only an image. If you use feedback, look for a smoother heart-rhythm wave that follows the breath (see 040). Failure to find any positive feeling is common in depression and grief; use the calm or ease option. [source: HeartCloud; synthesis]

4.5 Heart Lock-In technique

Purpose / when: A longer practice that HeartMath calls an "emotional restructuring technique". It is meant to recharge, sustain coherence for longer, and buffer stress and depleting emotions. [source: Heart Lock-In handout]
Steps:
1. Heart-Focused Breathing.
2. Activate a regenerative feeling such as appreciation, care or compassion, and hold it.
3. Radiate that feeling towards yourself and others.
4. When the mind wanders, return attention to the heart area and reconnect with the feeling. Afterwards, try to keep the feeling going for as long as possible.
5. Duration in the handout: five minutes or more, a couple of times a day, in a quiet place. Gentle uplifting music may help.
6. If a positive feeling will not come, use Quick Coherence or Freeze Frame first to find a helpful perception.
7. Track practice in the Heart Lock-In practice log: sessions, observations and a self-rated sense of coherence.
8. Quick version once familiar: breathe, activate, radiate. [source: Heart Lock-In handout]
Example language (illustrative): "Stay with that feeling of care. Now imagine sending some of it to yourself, and then outward to people in your life. If your mind drifts, that's fine, just come back to the chest and the feeling."
Watch for: Self-directed care can trigger shame or grief in self-critical clients. If so, begin by radiating outward, or pair this with compassion-focused work. The "radiating" wording can be offered as imagery without implying a physical field. [synthesis]

4.6 Freeze Frame technique

Purpose / when: To find more effective options when a problem, conflict or reaction is draining energy. HeartMath likens it to pausing a film: stop the "stress movie", notice the judgements and emotions, shift state, then edit the outcome. [source: Freeze Frame handout]
Steps:
1. Acknowledge the problem and your attitudes and feelings about it.
2. Heart-Focused Breathing.
3. Activate a renewing feeling such as appreciation or care.
4. From this steadier state, ask what a more efficient or effective attitude, action or solution would be.
5. Observe subtle shifts in perception or feeling. Commit to keeping the helpful ones and acting on the insights.
6. Quick steps once familiar: acknowledge, breathe, activate, ask, observe and act. [source: Freeze Frame handout]
7. Supporting worksheets: a basics table that records draining situations and how perception changed; a full worksheet that prompts each step and the planned coherent response; and a personal practice log. The handout suggests writing about the problem with a neutral attitude and noticing whether stress rises while writing, as a sign of what still needs attention. [source: Freeze Frame handout]
Example language (illustrative): "Let's pause on that argument with your manager. First, just name what you're feeling about it. Okay. Now breathe into the chest for a few breaths and find that steadier feeling. From here, ask yourself: what would a more effective response look like?"
Watch for: Answers that come straight from the stress state, such as "I should quit right now", mean the client should spend longer on steps 2–3. This technique fits well with problem-solving and cognitive restructuring; you can compare the coherent answer with a thought record. [synthesis]

4.7 Attitude Breathing technique

Purpose / when: To replace a draining attitude with a renewing one during stress triggers or "emotional storms". [source: Attitude Breathing handout]
Steps:
1. Notice the feeling or attitude you want to change and choose a replacement attitude.
2. Heart-Focused Breathing.
3. Breathe the new attitude slowly and casually through the heart area. Keep going for a while, because the shift takes time to feel real. Ingrained attitudes need a few minutes of sincere practice.
4. If no replacement comes to mind, breathe a neutral feeling to stop the drain.
5. Record entries in the practice log: date, situation, draining attitude, replacement, observations. [source: Attitude Breathing handout]
6. The handout pairs common states with replacements, for example stressed with ease, anxious with calm, judgemental with tolerance, and shame or guilt with self-acceptance and forgiveness. [source: Attitude Breathing handout]
Example language (illustrative): "What's the attitude here? Resentment. What would you rather carry into that meeting? Patience. Okay, breathe slowly through the chest and let each breath carry a bit of patience."
Watch for: Some of the handout's pairings, such as financial worry paired with "abundance", can feel invalidating when hardship is real. Pair Attitude Breathing with practical help, and choose replacements together with the client. [synthesis]

4.8 Inner-Ease technique

Purpose / when: To reduce mental and emotional "static" and keep balance during projects, hard emails or tense moments, and as a start-of-day set. [source: Inner-Ease page]
Steps:
1. Heart-Focused Breathing.
2. With each breath, bring in a feeling of ease to balance mental and emotional energy.
3. Set a sincere intention to hold that ease through upcoming challenges and interactions. [source: Inner-Ease page]
Pattern-change extension (same page): list two or three habits to change, such as impatience or irritation, without self-judgement. Ease into the heart, acknowledge the wish to change, and talk honestly with yourself about each habit. Treat doubt as the old pattern, then recommit and act. [source: Inner-Ease page] The page has no named author, so treat this as HeartMath-derived. [uncertain]
Example language (illustrative): "Before you open that email, take three easy breaths into the chest and let them bring in some ease. Then set the intention to keep that ease while you write your reply."
Watch for: Ease used to avoid a needed action. Check that the client still sends the email. [synthesis]

4.9 Heart-rhythm (HRV) coherence feedback with HeartMath technology

Purpose / when: To make the shift visible and speed learning, especially for clients who doubt anything is changing, and for children through games. [source: NREPP; Edwards 2016]
Description: HeartMath's emWave and Inner Balance systems use an ear or finger pulse sensor to show heart rhythm and a coherence level on screen. The NREPP-reviewed ADHD programme used three practice games. [source: NREPP; Edwards 2016] Device settings are not given here. Follow the manufacturer's training and 040 for general HRV-biofeedback procedure and equipment safety.
Steps (clinical use) [synthesis]:
1. Record a short baseline with no instruction.
2. Guide Quick Coherence and let the client watch the rhythm smooth out.
3. Debrief which inner moves helped: the breath pace, a particular memory, letting go of effort.
4. Gradually practise with the screen covered or the device removed, and compare.
5. Use device sessions as home practice only if the client owns or borrows a device, and log them.
Example language (illustrative): "Notice the line getting smoother as you found that feeling. Let's try once more with the screen turned away and see if you can get there on your own."
Watch for: Performance pressure, where chasing the score raises arousal. Signal artefacts from movement or poor sensor contact. Cardiac conditions that make readings unreliable. Over-reliance on the device. [synthesis; see 040]

4.10 Home practice plan and logs

Purpose / when: To build the skill between sessions. [source: Impact of Stress, Heart Lock-In, Freeze Frame and Attitude Breathing handouts]
Steps: Agree specific times, such as morning, midday and before bed, plus trigger-linked use. Give the matching HeartMath practice log for each technique. Review the logs at the start of every session, asking about situations, responses, observations, successes and challenges. [source: handouts]
Example language (illustrative): "Let's link Quick Coherence to three things you already do every day: your first coffee, lunch, and brushing your teeth at night."
Watch for: Empty logs (see section 5). A rising count of trigger-linked uses is the best sign that the skill is generalising. [synthesis]

4.11 Group delivery

Purpose / when: Workplace, school or clinic groups. The clinical certification includes group protocols. [source: FNNR listing]
Steps: HeartMath's own group protocols are not described in the sources cited [uncertain: not verified]. A plausible structure: one technique per session, in the order of section 2, with paired debriefing and logs. [synthesis]
Watch for: Social comparison of device scores, and pressure to share personal memories. Let people keep their feeling-memory private. [synthesis]
Example language (illustrative): "Everyone's readings differ, so there's no score to beat. Keep the memory you use private if you like; just share what you noticed." [synthesis]

4.12 Other HeartMath techniques

The clinical certification teaches six techniques. [source: FNNR listing] Only the five described above (Quick Coherence, Heart Lock-In, Freeze Frame, Attitude Breathing, Inner-Ease) were confirmed from HeartMath-authored material. Other technique names in HeartMath books and courses were not verified, so their steps are not given here. [uncertain] Doc Childre's books, such as Freeze Frame (Childre) and The HeartMath Solution (Childre & Martin), are cited from catalogue listings only [uncertain: not verified].

Purpose / when: orientation only, so you can answer clients who meet other HeartMath technique names. [synthesis]
Example language (illustrative): "I teach the techniques I've checked in HeartMath's own material. For any others, I'd want to see the source first." [synthesis]
Watch for: teaching techniques from unverified descriptions, or attributing wording to HeartMath that its own material does not contain. [synthesis]

5. Handling problems

Can't access a positive feeling (depression, grief, anhedonia). HeartMath advises using Quick Coherence or Freeze Frame first to find a helpful perception, adding uplifting music, choosing calm or ease instead, or breathing a neutral attitude. [source: Heart Lock-In, Attitude Breathing handouts; HeartCloud] Other options: use a small, concrete memory, such as a pet's greeting or a warm drink; aim for "slightly less tense" instead of joy; and do not let the client read failure as personal inadequacy. [synthesis]
Chest focus triggers panic, trauma memories or dissociation. Move attention to the breath elsewhere, keep eyes open, shorten practice to a few breaths, and ground the client in the room. Treat trauma within a phase-oriented trauma framework. Stop if the client becomes distressed. [synthesis]
Light-headedness, tingling or breathlessness. This suggests overbreathing. Make the breath gentler, not deeper, and let the client set the pace. The handouts already say any comfortable rhythm is fine. [source: Freeze Frame handout; synthesis] Refer to a physician for chest pain, palpitations or breathing problems that persist. [synthesis]
Performance anxiety about the coherence score. Cover the screen, praise effort over score, and stress that the aim is everyday regulation. [synthesis; see 040]
Non-adherence. Shrink practice to a few breaths, link it to existing habits, use phone reminders, and review logs without judgement. Explore ambivalence with motivational questions, for example "What would make one practice a day worth it?" [synthesis] The handout's target of four or five a day for three weeks is an aim, not a test. [source: Impact of Stress handout]
Sceptical client put off by the heart-field or intuition claims. Agree that these claims are contested (section 1). Present the work as slow breathing plus emotion regulation and point to HRV as a mainstream measure. Offer generic resonance-breathing or HRV biofeedback (040) if the branding gets in the way. [synthesis]
Client invested in the metaphysical claims (heart intelligence, intuition, global coherence). Respect their beliefs, but do not endorse decisions based on claimed heart-based foresight, such as financial or medical choices. Explore how they decide things. Watch for costly add-on purchases. [synthesis]
Positive-feeling practice used to suppress or bypass justified anger, grief or warnings. Return to Freeze Frame's acknowledgement step, validate the emotion, and use coherence to think clearly about action, not to override the feeling. Be alert to clients in abusive situations being urged to stay calm. [source: Freeze Frame handout; synthesis]
Being stuck: the shift happens in session but not in real life. Rehearse with imagined triggers, then live ones. Use the quick steps. Plan the exact cue, such as a hand on the door handle. [synthesis]
Rupture ("you're telling me to just think happy thoughts"). Acknowledge the misattunement, explain the technique as a way to steady the body before tackling the problem, and invite the client to set the pace and choose the content. [synthesis]
Medical conditions and medicines. Arrhythmias, pacemakers and medicines that affect heart rate can make HRV feedback misleading. Seek the client's physician's input, and never suggest changing any medicine. Coherence training is not a treatment for heart disease or any other physical illness. [synthesis; Domain IX practice]
Children and the ADHD use. The only NREPP-reviewed programme had one small study with fidelity concerns, so present it as adjunctive, not as a substitute for established ADHD care. [source: NREPP; synthesis]
Ending and relapse. Write a one-page plan: which technique to use for which trigger, early warning signs, and a weekly Heart Lock-In "maintenance" session. Offer a booster session. [synthesis]

Sources

Online sources:

Not verified (named only): HeartMath's own research overview and certification pages [uncertain: not verified]. The books below appeared only as catalogue listings: Childre D, Freeze Frame; Childre D & Martin H, The HeartMath Solution. Their dates and editions were not verified [uncertain].

Cross-reference: 040 HRV biofeedback (general HRV/resonance-breathing procedure, BCIA certification, equipment safety, evidence status).

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