Slow breathing and the Wim Hof Method are opposite practices. Slow coherent breathing at about six breaths a minute calms the nervous system: it raises heart rate variability, lowers blood pressure on the spot, and helps with sleep, at very low risk. The Wim Hof Method uses fast cyclic breathing, breath holds, and cold to raise adrenaline and alertness, with a short-term effect on the immune response.
One firm rule applies: the fast breathing stays on dry land, because before a breath hold it can cause a blackout. Tested head to head for mood, the two came out about equal, so the choice is the state you want and the one you will keep up.
Findings & Outcomes
⚠ Safety: the Wim Hof breathing belongs on dry land. See Cautions.
How They Compare
What Each Does To Your Physiology
Slow breathing works by resonance. At about six breaths a minute the breath synchronizes with the baroreflex, the roughly five-second loop that adjusts heart rate to changes in blood pressure. The two rhythms reinforce each other, the heart rate swings wide, and the calming, parasympathetic branch of the nervous system dominates. That coupling is why six a minute, not some faster pace, is the target. The shared mechanism is set out on resonance and entrainment, and the practice with its protocol on breathwork and HRV.
The Wim Hof Method drives the reverse state. Rounds of forced fast breathing lower carbon dioxide into respiratory alkalosis, the breath holds add brief drops in oxygen, and the combination produces a surge of adrenaline: a sympathetic, aroused pattern. Brain imaging of the method points to a central driver rather than a peripheral one, engaging control centers that blunt the felt response to cold and hold attention under a hard stimulus. The two practices move the nervous system in opposite directions.
Anxiety And Stress
Both ease stress, and where they have been measured against each other the results sit close together.
A systematic review of slow breathing in healthy people found it reliably shifts people toward calm, with less anxiety, arousal, and low mood alongside a rise in heart rate variability. When one trial pitted the two directly against each other in 84 women with high stress and depressive symptoms, they produced about equal reductions over three weeks: depressive symptoms down roughly 24 percent, anxiety about 27 percent, and perceived stress about 20 percent, all sustained at three months. The Wim Hof arm showed one edge, a greater drop in rumination after stressful days, though the authors flag it for replication and note that all six dropouts came from that arm while participants rated the slow-breathing control as more credible.
Blood Pressure And Heart Rate Variability
Slow breathing has the clearer claim here. In people with high blood pressure, breathing at six a minute dropped systolic pressure from about 150 to 141 mmHg on the spot and nearly doubled baroreflex sensitivity. Trained near the resonance rate, usually with heart rate variability biofeedback, it drives heart rate variability up and gives a small to moderate benefit for stress and anxiety, among its larger measured effects. The long-term picture from daily home practice is weaker: a pooled analysis of device-guided breathing found no significant lasting reduction in blood pressure, so the strongest evidence is the immediate in-session drop.
The Wim Hof Method is not a blood-pressure practice. Its active phase raises sympathetic drive and briefly raises blood pressure, where slow breathing lowers it.
Energy And The Immune Response
The Wim Hof Method's most distinctive finding is acute and immune. Trained volunteers raised adrenaline enough to blunt the inflammatory response to an injected bacterial toxin, with more of the anti-inflammatory signal IL-10, less of the pro-inflammatory TNF, IL-6, and IL-8, and fewer flu-like symptoms. That effect is repeatable and specific to the acute challenge.
The wider claims for lasting energy and focus are less settled. Across the trials so far the performance results are mixed, and the subjective lift has not been separated from expectancy and the strong appeal of the method. Slow breathing makes no comparable immune claim; its measured effects are calm, sleep, and blood pressure.
The Safety Split
The risk profiles are not symmetric, and this is the single most important difference. Slow, quiet breathing is very low risk and suits nearly everyone. The Wim Hof breathing carries a specific hazard, because cyclic hyperventilation before a breath hold can cause a blackout with little warning.
The one firm rule: keep the fast Wim Hof breathing, and any breath hold, on dry land. Done before submersion it can cause a blackout with no warning, and underwater that blackout drowns people.
The full mechanism and the situations that call for care are gathered under Cautions.
The Research & Studies
Everything here is based on the research we have collected and checked, sorted into groups and ordered with the strongest evidence first. Click any claim to open the studies behind it.
Mood & stress
Slow breathing leaves people calmer and less anxious
Breathing slowly, under about ten breaths a minute, moves the nervous system toward its calm setting and leaves people feeling steadier, with less anxiety and less arousal.
A systematic review of fifteen studies in healthy people, drawn from an initial pool of 2,461 abstracts, found slow breathing techniques consistently raise heart rate variability and respiratory sinus arrhythmia, mark a rise in EEG alpha and a fall in theta, and pair with self-reported gains in comfort, vigor and alertness and drops in anxiety, anger, depression and confusion. The review reports a direction of effect rather than a single pooled number, so the size varies with the technique and how long it is practiced.
Who this may not transfer to:The review does not report a sex breakdown across its included studies, so any difference in the effect between women and men is untested.
The study · 1
Zaccaro et al., How breath-control can change your life: a systematic review on psycho-physiological correlates of slow breathing · Front Hum Neurosci 2018;12:353
Head to head, the two eased depression, anxiety and stress about equally in 84 women
When the two were tested against each other, they eased depression, anxiety and stress by about the same amount, and both effects lasted three months; the Wim Hof group ruminated a little less after stressful days.
A randomized controlled trial assigned 84 midlife women with high stress and high depressive symptoms to either a Wim Hof Method condition (intermittent-hypoxia breathing plus cold showers) or an active control (slow-paced breathing plus warm showers), each with 15 minutes of daily audio for three weeks. Both groups improved equally: depressive symptoms fell about 24 percent, anxiety about 27 percent and perceived stress about 20 percent, sustained at three months, with comparable reductions in cortisol reactivity to a lab stressor. The Wim Hof arm had a greater reduction in rumination after daily stressors, a finding the authors say needs replication. All six dropouts were from the Wim Hof arm, and participants rated the slow-breathing control as more credible.
Who this may not transfer to:Tested only in midlife women with high stress and depressive symptoms, so whether the two practices stay equivalent in men, or in people without these symptoms, is untested.
Because the two eased mood equally, the practical choice is not which works better for mood but which state you want and which you will actually keep up: slow breathing for calm and recovery, the Wim Hof style for a stimulating challenge, kept out of the water.
The study · 1
Blades et al., a randomized controlled clinical trial of a Wim Hof Method intervention in women with high depressive symptoms · Compr Psychoneuroendocrinol 2024;20:100272
Heart And Vascular
Breathing at six a minute drops systolic pressure from about 150 to 141 mmHg on the spot
Slowing the breath to about six a minute drops blood pressure while you do it, by roughly nine points on the top number in people with high blood pressure.
In a controlled laboratory study of 20 people with essential hypertension and 26 controls, breathing at six breaths a minute reduced systolic pressure from 149.7 to 141.1 mmHg and diastolic from 82.7 to 77.8 mmHg, and raised arterial baroreflex sensitivity from 5.8 to 10.3 ms/mmHg, all measured on the spot without inducing hyperventilation. The lasting effect of home practice is less settled: a meta-analysis of 22 trials in 17,214 people found device-guided slow breathing did not significantly reduce blood pressure over time, with high heterogeneity between studies, so the strongest evidence is for the immediate in-session drop rather than a large chronic change.
Who this may not transfer to:The study does not report its results split by sex, so whether the size of the blood-pressure drop differs for women and men is untested.
The studies · 2
Joseph et al., slow breathing improves arterial baroreflex sensitivity and decreases blood pressure in essential hypertension · Hypertension 2005;46(4):714-718
de Freitas Goncalves et al., device and nondevice-guided slow breathing to reduce blood pressure in hypertensive patients: a systematic review and meta-analysis · Health Sci Rep 2022;5(3):e636
Anxiety And Stress
Slow breathing near six a minute drives heart rate variability up and eases anxiety
Practicing slow breathing near six a minute swings the heart rate into big smooth waves and gives a small to moderate drop in stress and anxiety, which is one of its strongest measured effects.
A systematic review and meta-analysis pooling 58 randomized studies found heart rate variability biofeedback, which trains breathing near each person's resonance rate, produced small to moderate improvements across stress, anxiety and related outcomes, with anxiety among the larger effects. The authors note the number of studies per condition is small and call for confirmation. The mechanism is separate physiological work rather than part of the pooled trials.
Who this may not transfer to:The meta-analysis does not report participant sex, so any difference in the effect between women and men is untested.
The study · 1
Lehrer et al., heart rate variability biofeedback improves emotional and physical health and performance: a systematic review and meta-analysis · Appl Psychophysiol Biofeedback 2020;45(3):109-129
How it works
Slow breathing at six a minute resonates with the baroreflex and settles the nervous system
Breathing at about six a minute lines up with the body's blood-pressure control loop, which is why the heart rate swings wide and the nervous system settles.
The baroreflex takes about five seconds to complete a cycle, giving it a natural frequency near 0.1 Hz, which is six cycles a minute. Breathing at that rate couples the breathing rhythm to the pressure-control loop so the two reinforce each other, driving heart-rate oscillations far larger than at rest and raising baroreflex gain. This is a mechanism of resonance and parasympathetic engagement, the opposite direction of travel from a practice built on arousal. The shared physiology behind it is set out on the resonance and entrainment page.
The study · 1
Lehrer & Gevirtz, heart rate variability biofeedback: how and why does it work? (the baroreflex mechanism) · Front Psychol 2014;5:756
The Wim Hof Method drives an aroused, sympathetic state through fast breathing, breath holds and cold
The Wim Hof Method uses fast forced breathing, breath holds and cold to switch the body into an aroused, stimulated state, which is the reverse of what slow breathing does.
Brain imaging of the method's originator alongside a control group found the practice activates the periaqueductal gray, a control center for descending pain and cold signals that can trigger a stress-induced analgesic response, and higher-order insula regions tied to focused attention under aversive input. Whole-body PET during cold found forceful breathing raised sympathetic activity and heat production in the intercostal muscles, while brown-fat activation was unremarkable. The authors read this as evidence that the brain, more than the periphery, drives the cold tolerance. The core imaging rests on a single practitioner, so it describes a plausible mechanism rather than a group-level fact.
Who this may not transfer to:The core imaging comes from a single male practitioner, so whether the same brain response occurs in women, or in typical practitioners, is untested.
The study · 1
Muzik, Reilly & Diwadkar, brain over body: a study on the willful regulation of autonomic function during cold exposure · Neuroimage 2018;172:632-641
Sleep
Twenty minutes of slow breathing before bed helped insomniacs fall asleep faster
Doing about twenty minutes of slow breathing before bed helped people with insomnia fall asleep faster and wake up less during the night.
In a controlled study of 14 self-reported insomniacs and 14 good sleepers, the insomniacs showed reduced high-frequency (vagal) heart rate variability at baseline. Practicing slow paced breathing at 0.1 Hz for 20 minutes before sleep raised total heart rate variability and, on polysomnography, shortened sleep onset latency, reduced the number and duration of awakenings, and increased sleep efficiency. It is a small early study, so the effect is emerging rather than settled.
Who this may not transfer to:The study does not report a sex split, so whether the sleep benefit differs for women and men is untested.
The study · 1
Tsai et al., efficacy of paced breathing for insomnia: enhances vagal activity and improves sleep quality · Psychophysiology 2015;52(3):388-396
Immune Function
Wim Hof training let 12 volunteers blunt the inflammation response to an injected toxin
People trained in the method released a burst of adrenaline that quieted the body's inflammation reaction to an injected bacterial toxin, and they felt fewer flu-like symptoms.
In a randomized trial, 12 healthy volunteers were trained for ten days in meditation, cyclic hyperventilation followed by breath retention, and cold immersion, while 12 controls were not. All then received intravenous E. coli endotoxin. Practicing the techniques produced intermittent respiratory alkalosis and hypoxia and profoundly increased plasma epinephrine, which correlated with a faster and higher rise in the anti-inflammatory cytokine IL-10 and with lower levels of the pro-inflammatory mediators TNF, IL-6 and IL-8, plus fewer flu-like symptoms. It is a single small trial in a laboratory challenge, so it demonstrates an acute mechanism rather than a proven treatment for any inflammatory disease.
Who this may not transfer to:The trial reports healthy volunteers without a stated sex split, so whether the immune effect differs by sex is untested.
The study · 1
Kox et al., voluntary activation of the sympathetic nervous system and attenuation of the innate immune response in humans · Proc Natl Acad Sci USA 2014;111(20):7379-7384
Cognition
The Wim Hof Method's clearest signal is lower inflammation, not the energy and focus fans describe
The energy and focus that fans describe are not yet established: the trials point most clearly to a short-term inflammation effect, while the performance results are mixed.
A systematic review following PRISMA identified nine papers covering eight trials of the full method. The most consistent finding was reduced inflammation, driven by the adrenaline surge that raises IL-10 and lowers pro-inflammatory cytokines. Effects on exercise performance were mixed, and effects on respiratory measures such as minute ventilation and tidal volume were mixed following bouts of exercise. The review calls for further study in people with inflammatory disorders. The subjective energy and focus that practitioners report have not been isolated from expectancy and the strong appeal of the method and its instructor.
Who this may not transfer to:The review does not break its included trials down by sex, so any difference in these outcomes between women and men is untested.
The study · 1
Almahayni & Hammond, does the Wim Hof Method have a beneficial impact on physiological and psychological outcomes in healthy and non-healthy participants? A systematic review · PLoS One 2024;19(3):e0286933
When To Choose Which
Choose slow breathing when you want to come down. It costs nothing, needs only a clock, and carries almost no risk, so it is the default for:
- anxiety and everyday nervous-system balance,
- winding down toward sleep,
- lowering blood pressure in the moment,
- a daily habit of steadying yourself.
Choose the Wim Hof Method when you want a stimulating challenge: a jolt of morning alertness, cold adaptation, or the short-term immune and adrenaline effects that drew interest to it. Treat it as the arousal practice it is, keep the fast breathing on dry land and off the road, and build up slowly. Many people use both, slow breathing in the evening to recover and settle, the Wim Hof style earlier in the day for a deliberate charge.
Go Deeper
- Breathwork and HRV: the slow-breathing practice in full, with the protocol and what a heart rate variability reading means.
- Resonance and entrainment: the mechanism behind the heart-breath coupling both practices touch.
- Cold exposure: the cold half of the Wim Hof Method, on its own terms.
- Anxiety: where slow breathing sits among the things that help, at its measured size.
- Insomnia: where a pre-sleep breathing habit fits among the things that improve sleep.
The Chinese Medicine View
Chinese medicine has a long, careful account of the breath, and it maps onto this split closely. The Lung governs Qi and controls respiration, and 調息, regulating the breath, is one of the three regulations of practice alongside regulating the body and the mind. A slow, long exhale with the breath sunk to the lower abdomen, 氣沉丹田, descends and settles Qi. That downbearing, quieting direction is the same territory as slow coherent breathing: it calms the Shen and draws the system inward and down, a Yin-favoring, restorative state.
Forceful, rapid breathing with retained breath moves and raises Qi and stirs Yang, an outward, activating direction. That is the territory the Wim Hof style occupies, and the tradition treats such vigorous, held-breath work as an advanced practice done under a teacher. It also holds that the breath does not suit everyone the same way. Someone with Yin deficiency and heat, dry and restless with warm palms and soles, is directed toward soft, unforced breathing and away from anything vigorous or held, while a stronger, cooler, more stagnant constitution may do well with more activating work.
In this frame the choice between the two practices is a choice about which way to move the Qi, toward settling or toward raising, matched to the person and the state. The Yang Sheng frame of nourishing life holds both, and the same breath care runs through tai chi and qi gong. This is a lens on the body, not a proof of the modern physiology.
Cautions
Extra restraintEverything to be aware of is here, in one place. This practice suits most healthy people; a few situations call for real care.
Fast breathing before a breath hold in water can cause a fatal underwater blackout
A New York State case review of drownings from 1988 to 2011 identified 16 cases linked to what the authors named dangerous underwater breath-holding behaviors, including intentional hyperventilation before submersion; two healthy young men died in a single 2011 incident after hyperventilating before going underwater. The mechanism is hypoxic blackout: because the drive to breathe is triggered by rising carbon dioxide rather than falling oxygen, pre-breathing that strips out carbon dioxide delays that drive until oxygen has dropped enough to cause loss of consciousness, often with no warning. On land this is manageable; underwater it leads to drowning. This is why the fast cyclic breathing and any breath hold belong away from the pool, the bath and open water.Boyd et al. (CDC), fatal and nonfatal drowning outcomes related to dangerous underwater breath-holding behaviors, New York State, 1988-2011
The Wim Hof breathing and water
A round of fast, deep breathing before a breath hold clears out carbon dioxide without adding much oxygen. Because the urge to breathe is driven by rising carbon dioxide rather than falling oxygen, that urge can arrive only after oxygen has dropped far enough to cause a blackout, and it can come with little warning. On land that is manageable. In water it can be fatal, so keep the fast breathing and any breath hold away from the pool, the bath and open water.
A second person, on land
Loss of consciousness during heavy breathing or a breath hold can happen even out of the water, so the Wim Hof breathing is best done sitting or lying on a soft surface, and ideally with someone else nearby, not while driving or standing.
Pregnancy
Slow, quiet breathing is fine in pregnancy. Deliberate over-breathing lowers carbon dioxide enough to narrow the vessels feeding the uterus, which is established obstetric physiology, and the forceful cyclic breathing has not been studied in pregnancy, so it is best set aside during it.
Heart, epilepsy and other conditions
If you have uncontrolled high blood pressure, a recent cardiac event, aortic disease or epilepsy, the forceful breath holds and hyperventilation rounds drive large swings in blood pressure and blood chemistry, so talk to a doctor before taking the Wim Hof Method up. Slow paced breathing at six a minute is the gentle practice studied in these conditions and is a different matter.
Slow breathing is safe for most
Slow, quiet breathing at about six a minute carries almost no risk for healthy people. If breathing feels like effort, take smaller breaths at the same slow rate, since forcing the volume tips slow breathing into over-breathing.
Start slow, be smart, read the research, and consult a professional if you have any concerns. This is here to inform your choice, not make it for you.
Common Questions
Which is better, slow breathing or the Wim Hof Method?
Neither is better in general, because they do opposite things. Slow breathing near six a minute calms the nervous system, lowers blood pressure and supports sleep at very low risk, so it is the better fit for anxiety, recovery and daily balance. The Wim Hof Method raises adrenaline and alertness and has a short-term effect on the immune response, so it fits a stimulating challenge or cold adaptation. When the two were compared head to head for mood, they came out about even. Choose by the state you want, calm or charged, and by which you will actually keep up.
Is the Wim Hof Method safe?
For most healthy people the breathing itself is safe on dry land, done sitting or lying down. The danger is doing the fast breathing before a breath hold in or near water, because it can cause a blackout with little warning, which has led to drownings. A case review of drownings tied to hyperventilation-and-breath-hold behaviors is why this is treated as a firm line. People who are pregnant, or who have uncontrolled high blood pressure, heart disease or epilepsy, should check with a doctor first. The cold and the breathing are best built up gradually.
Does slow breathing actually lower blood pressure?
While you do it, yes. In people with high blood pressure, breathing at six a minute dropped systolic pressure by roughly nine points on the spot and raised the sensitivity of the baroreflex, the loop that adjusts heart rate to pressure. The longer-term picture from daily home practice is weaker, since a large pooled analysis of device-guided breathing did not find a significant lasting reduction. So the clear win is the immediate in-session drop, with the daily habit best judged over weeks against your own readings.
Can I do both?
Yes, and many people do. They serve different ends: slow breathing to recover, settle and prepare for sleep, and the Wim Hof style for a deliberate charge of alertness or cold adaptation. A natural pattern is the stimulating practice earlier in the day and slow breathing in the evening. Keep the Wim Hof breathing on dry land, build both up slowly, and let how you feel guide the dose.
Which one helps with sleep?
Slow breathing. About twenty minutes of slow paced breathing before bed helped people with insomnia fall asleep faster, wake less during the night and sleep more efficiently, alongside a rise in the calming, vagal side of heart rate variability. The Wim Hof Method is an arousal practice and points the wrong way for sleep, so if better sleep is the goal, the slow, quiet version done in the evening is the one to reach for. More on the sleep side is on the insomnia page.
Explore Related
Other pages this one connects to, by the evidence they share, the outcomes they touch, and the ground they cover.
All 11 sources on this page independently checked and cross-referenced.
Thomas Dehli, Founder & Editor, Sacred Lotus
Sacred Lotus has published Chinese medicine reference material since 2001. Integrative pages are held to the same standard as the herb and formula library: cite the source, grade the claim at its real strength, and say where the research has not looked. This page is educational and it is not medical advice. Last reviewed and updated August 10, 2026.
Evidence strength
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