Breathwork (Pixabay: rafaelsico2018)

Breathwork for Flow State: Hacking Your Brain for Peak Performance

Updated: April 2026

Quick Answer

Breathwork shifts your brain into flow state by lowering cortisol, raising nitric oxide, and synchronising alpha-theta brainwaves. Techniques like cyclic sighing, box breathing, and coherent breathing at 5-6 breaths per minute prime your nervous system for deep, effortless focus in under 10 minutes.

Last Updated: March 2026

Key Takeaways

  • Breath controls brain chemistry: Deliberate breathing patterns raise nitric oxide, lower cortisol, and shift brainwaves toward the alpha-theta border associated with flow.
  • Cyclic sighing is fastest for calm: A double inhale followed by a long exhale reduces anxiety and lifts mood faster than other breathing techniques, per 2023 Stanford research.
  • CO2 tolerance is trainable: Learning to tolerate slightly higher CO2 through slow breathing expands your capacity to stay in focused states under pressure.
  • Match technique to performance type: Slower patterns support precision and creative flow; activating patterns suit explosive physical performance.
  • Consistency builds the baseline: Daily morning breathwork lowers baseline anxiety and makes flow states easier to access throughout the day, not just in the moment.

What Is Flow State and Why Does It Feel So Good?

Flow state is the experience of being completely absorbed in an activity. Time seems to disappear. Effort drops away. You stop second-guessing yourself and simply do. Athletes call it being "in the zone." Musicians describe playing "on autopilot." Writers talk about the words arriving fully formed.

Psychologist Mihaly Csikszentmihalyi spent decades studying this phenomenon and defined flow as an optimal state of consciousness where performance and enjoyment peak simultaneously. His research, published across multiple books and journals beginning in the 1970s, identified flow as one of the most reported sources of deep satisfaction in human life.

From a neuroscience perspective, flow state involves a predictable set of brain changes. The prefrontal cortex, which handles self-monitoring, self-doubt, and metacognition, becomes less active in a process researchers call transient hypofrontality. With the inner critic quieted, other brain networks can operate with less interference. Alpha and theta brainwaves increase. Neurochemicals including dopamine, norepinephrine, anandamide, and serotonin all rise, producing the feelings of focus, pleasure, and calm that characterise flow.

The challenge is that flow does not arrive on command. You cannot simply decide to enter it. You need to prepare the conditions. That is precisely where breathwork becomes so useful.

Why Breathwork Works as a Flow Trigger

Flow researcher Steven Kotler identifies six internal triggers for flow: clear goals, immediate feedback, challenge-skills balance, intense focus, control, and rich environment. Breathwork directly supports at least three of these by reducing anxiety (which disrupts the challenge-skills balance), improving attentional focus, and moving the nervous system from sympathetic dominance (fight-or-flight) into the calm-alert state that supports deep work. It is one of the most reliable, fast-acting levers available to any practitioner.

The Breath-Brain Connection: What Science Says

Breathing is unique among bodily functions. It operates automatically through the brainstem, but you can override it and control it consciously. This voluntary control gives you a direct line into your autonomic nervous system, the part of your body that governs stress response, digestion, heart rate, and much more.

When you breathe fast and shallow (the default for most stressed adults), you blow off more carbon dioxide than your body needs to shed. This hypocapnia causes blood vessels to constrict, reduces oxygen delivery to the brain, and keeps the sympathetic nervous system in a mild state of activation. You feel anxious, scattered, and alert to threat rather than alert to opportunity.

When you slow and deepen your breath intentionally, CO2 rises to its optimal level. Blood vessels dilate. The vagus nerve activates and sends calming signals up to the brain. Heart rate variability (HRV) increases, which is a measure of nervous system flexibility and resilience that correlates strongly with both peak performance and emotional regulation.

Research by Dr. Andrew Huberman at Stanford has mapped several of these pathways precisely. His lab's 2023 study published in Cell Reports Medicine compared multiple breathing interventions and found measurable differences in mood, anxiety, and physiological stress markers after just five minutes of deliberate practice. The specific details of that study's findings will appear in the cyclic sighing section below.

Brainwave research adds another layer. Neurofeedback studies have shown that slower breathing rates, particularly the 5-6 breaths per minute range known as coherent breathing, reliably increase alpha brainwave amplitude. Alpha waves (8-12 Hz) are associated with relaxed attention. Just below them, theta waves (4-8 Hz) correspond to creative insight, hypnagogia, and the loose associative thinking that often precedes breakthrough ideas. The alpha-theta border is where many researchers place the neurological signature of flow.

Heart Rate Variability and Flow

HRV is the variation in time between consecutive heartbeats. Higher HRV generally reflects a more flexible, responsive nervous system. Multiple studies link high HRV to better emotional regulation, sustained attention, and performance under pressure. Breathwork, particularly paced breathing at 5-6 cycles per minute, reliably increases HRV within minutes.

A 2018 study in Applied Psychophysiology and Biofeedback found that HRV biofeedback training, which trains participants to breathe at their resonance frequency to maximise HRV, improved performance on attention and working memory tasks. These are exactly the cognitive capacities that deteriorate under stress and flourish during flow.

Nitric Oxide and Nasal Breathing

Breathing through the nose rather than the mouth produces significantly more nitric oxide, a vasodilator that improves circulation, enhances oxygen transfer in the lungs, and has antimicrobial effects. Research from the Karolinska Institute in Sweden found that nasal breathing produces 15 to 25 times more nitric oxide than mouth breathing. Better blood flow to the brain creates a more favourable environment for the sustained, high-functioning mental states that flow requires.

Best Breathwork Techniques for Flow State

Not all breathwork produces the same results. The technique you choose should match your goal. Some patterns calm a hyperactivated nervous system. Others build CO2 tolerance so you can stay composed under pressure. Some temporarily activate adrenaline for explosive output. Understanding these distinctions helps you select the right tool.

The table below compares the most well-researched techniques by their primary mechanism and ideal use case.

Technique Pattern Primary Effect Best For
Cyclic Sighing Double inhale, long exhale Rapid CO2 release, parasympathetic activation Quick anxiety reduction before focused work
Box Breathing 4-4-4-4 (in, hold, out, hold) Nervous system regulation, CO2 tolerance Pre-performance reset, military and tactical use
Coherent Breathing 5-6 breaths/min (5 sec in, 5 sec out) HRV increase, alpha wave boost Sustained creative or cognitive flow sessions
4-7-8 Breathing Inhale 4, hold 7, exhale 8 Deep parasympathetic activation Transitioning from stress to deep focus
Wim Hof Method 30 power breaths + retention Adrenaline surge, alkalisation Physical flow and cold exposure preparation
Nadi Shodhana Alternate nostril breathing Hemispheric balance, calm alertness Creative work, meditation lead-in

The following sections walk through each major technique in detail, with exact counts, physiological explanation, and practical guidance for when to use it.

For a deeper look at how these integrate into a morning practice, see the morning breathwork guide on the Quantum Codex. The pranayama exercises article also covers the classical Indian system in more detail.

Cyclic Sighing: The Stanford Protocol

Cyclic sighing is the technique that has received the most scientific attention in recent years, thanks to a well-designed randomised study from the Huberman Lab at Stanford University.

The pattern is simple. Take a normal inhale through the nose. At the top of that inhale, take one more short sniff to maximally inflate the lungs (popping open any collapsed alveoli). Then exhale slowly and fully through the mouth until your lungs are empty. Repeat for five minutes.

How to Practice Cyclic Sighing

  1. Sit or lie in a comfortable position with your spine relatively long.
  2. Inhale through the nose for about 2-3 seconds, filling your lungs about 70%.
  3. At the top of that inhale, take one more short, sharp sniff through the nose to fully inflate.
  4. Exhale slowly through the mouth for 5-7 seconds until your lungs feel empty.
  5. Repeat without rushing. Let the next inhale begin naturally.
  6. Continue for 5 minutes as a standalone practice, or use 3-5 cycles as a quick reset before entering focused work.

The 2023 Cell Reports Medicine study by Balban and colleagues compared cyclic sighing, box breathing, cyclic hyperventilation, and mindfulness meditation across 114 participants over 28 days. Participants practised their assigned technique for five minutes per day. Cyclic sighing produced the largest reductions in self-reported anxiety and the greatest improvements in positive affect, outperforming both other breathing techniques and mindfulness on these two measures. All breathwork groups outperformed mindfulness on physiological measures of calm, including respiratory rate and HRV.

Why does cyclic sighing work so well? The long exhale is the key mechanism. Exhaling activates the parasympathetic branch of the autonomic nervous system by slowing the heart. The double inhale maximally reinflates lung tissue, improving the efficiency of the subsequent exhale and expelling more CO2 than a standard breath cycle. The result is rapid physiological calming without drowsiness, producing the alert-but-relaxed state that flow requires.

Box Breathing for Focused Calm

Box breathing is the technique taught to US Navy SEALs, emergency responders, and high-performance athletes for regulating the nervous system under extreme pressure. Its four-equal-phase structure makes it easy to learn, time, and remember when you are already stressed.

The pattern: inhale for 4 counts, hold for 4 counts, exhale for 4 counts, hold for 4 counts. One cycle takes 16 seconds. At this pace you complete about 3.75 breaths per minute, which is slow enough to significantly boost HRV and shift brainwave activity toward alpha.

Why the Holds Matter

The breath holds in box breathing serve a specific purpose. The hold after the inhale temporarily raises CO2, training the chemoreceptors in your brainstem to tolerate higher CO2 levels without triggering panic. Over time, this makes you calmer under pressure. The hold after the exhale extends parasympathetic activation and creates a brief moment of neurological stillness that some practitioners describe as a "reset" between cycles.

Variations for Different Purposes

You can adjust the counts to change the effect. A 4-4-6-2 pattern (longer exhale) amplifies calming. A 5-5-5-5 pattern increases the total cycle length for deeper practice. Some practitioners drop the post-exhale hold entirely when starting out, using a simple 4-0-4-0 pattern before adding the holds once the basic rhythm feels natural.

Box breathing is best used as a pre-performance primer: 4 to 6 minutes before entering a demanding work session, a difficult conversation, or a creative project that requires sustained focus. It is also effective as an "interrupt" technique, breaking a stress spiral when you notice your attention fragmenting mid-session.

Coherent Breathing: The 5-Minute Flow Primer

Coherent breathing, sometimes called resonance breathing or HRV breathing, is based on a specific physiological fact: every person has a resonance frequency at which their cardiovascular, respiratory, and autonomic systems synchronise most efficiently. For most adults, this frequency is approximately 5-6 breaths per minute, which corresponds to roughly 5 seconds of inhalation and 5 seconds of exhalation.

At this rate, the Mayer waves in blood pressure, the respiratory cycle, and the cardiac cycle all align. HRV peaks. The vagus nerve fires maximally. Alpha brainwave amplitude increases significantly. This state has been described by researchers as "autonomic coherence" and it maps closely to what practitioners describe as the calm-alert baseline from which flow becomes accessible.

Coherent Breathing and Brainwave Synchronisation

Research by Dr. Leah Lagos and Dr. Evgeny Vaschillo has shown that practising coherent breathing for 20 sessions of 20 minutes each produces lasting increases in resting HRV, improved emotional regulation, and better performance on tasks requiring sustained attention. The alpha wave increases observed during practice also persist to some degree after the session ends, meaning the brainwave environment favourable to flow carries over into the work period that follows.

To practise coherent breathing, set a gentle audio guide or visual pacer (many free apps exist) to a 5-second inhale and 5-second exhale cycle. Breathe through the nose if possible. Keep the breath smooth and even, not forced. There is no need to breathe deeply, just consistently at that pace. Begin with 5 to 10 minutes and work up to 20 minutes for deeper effects.

Coherent breathing is the most recommended technique for writers, coders, musicians, researchers, and anyone engaged in extended cognitive or creative work. It lacks the dramatic subjective effect of more activating techniques, but its impact on the sustained, undistracted attention that deep work requires is substantial and well-documented.

Holotropic Approaches and Deeper States

On the far end of the breathwork spectrum sit holotropic and connected breathing practices, which use faster, fuller breathing to produce non-ordinary states of consciousness. Developed by psychiatrist Stanislav Grof after the legal restriction of LSD research in the 1970s, holotropic breathwork uses sustained rhythmic hyperventilation to induce visionary experiences, emotional catharsis, and deep psychological insight.

These techniques do produce altered states, and some practitioners report profound breakthroughs in creativity, emotional release, and self-understanding from a single session. However, the physiological mechanisms are very different from the calming techniques discussed above. Hyperventilation drops CO2, which causes cerebral vasoconstriction, altered perception, tingling in the limbs, and in some cases tetanic muscle contractions. These are not flow states in the athletic or cognitive sense; they are closer to psychedelic-adjacent experiences with therapeutic applications.

For the purposes of accessing flow for peak performance, holotropic techniques are not the primary tool. They have value in specific contexts, particularly for creative breakthroughs and processing deeply held emotional patterns that block consistent performance. The full holotropic breathwork tutorial on Quantum Codex covers the practice, safety considerations, and integration process in depth.

Rebirthing and Conscious Connected Breathing

Closely related to holotropic work, conscious connected breathing (sometimes called rebirthing breathwork) removes the pause between inhale and exhale, creating a continuous loop. Practitioners report that this technique dissolves the typical filtering of conscious experience and can surface suppressed emotions and insights. Like holotropic breathwork, it is best practised under experienced guidance.

What these deeper techniques share with the calming techniques is the core principle: breath controls the internal state, and internal state determines the quality of attention and experience available to you.

Building a Pre-Performance Breathwork Protocol

A practical pre-performance breathwork protocol combines two or three techniques in sequence, each serving a specific function. The structure below works for most cognitive and creative performance contexts. Adapt the timing and intensities to your own needs.

A 15-Minute Pre-Performance Breathwork Sequence

Phase 1: Arrival (3 minutes)

Begin with simple nasal breathing, no specific pattern. Just notice the breath. Let it slow naturally. This allows the body to transition from whatever you were doing before to a state of deliberate attention.

Phase 2: Cyclic Sighing (5 minutes)

Move into cyclic sighing to clear accumulated physiological tension. Use the double-inhale, long-exhale pattern. This phase handles any residual anxiety or stress that would otherwise compete with focus during your session.

Phase 3: Coherent Breathing (7 minutes)

Transition into 5-second in, 5-second out coherent breathing. This builds the alpha brainwave environment and HRV peak that supports sustained focused work. By the end of this phase you should feel alert, calm, and ready to engage fully with your task.

After completing this sequence, begin your work immediately without checking your phone, email, or any other interruption source. The physiological window of calm alertness you have created is real but time-limited. Each interruption costs you nervous system resources that take time to rebuild.

Adjustments for Physical Performance

If you are preparing for physical performance rather than cognitive work, replace Phase 3 with a short Wim Hof-style activation sequence: 20 to 25 power breaths (deep in through nose, forceful out through mouth) followed by a breath hold. This raises adrenaline and alkalises the blood temporarily, priming the body for explosive output. Finish with 2 minutes of calm nasal breathing before beginning your activity.

What to Pair with Breathwork for Flow

Breathwork is most effective when paired with a few other flow-supporting practices. Clear intention setting before the session (knowing exactly what you will work on) provides the goal-clarity that Kotler identifies as a flow trigger. Removing all digital interruptions during the work period protects the state once it is established. Some practitioners add a single cup of quality green tea for gentle caffeine and L-theanine, which together have been shown to support calm alertness without the jitteriness of coffee alone.

Some practitioners find that certain ORMUS gold preparations or mineral-rich wellness tools support their breathwork practice by providing trace mineral support that the nervous system depends on for optimal neurotransmitter function. Wellness tools that support nervous system regulation can complement a dedicated breathwork practice when used consistently.

Ancient Traditions and Modern Science

The discovery that breath controls mental states is not new. Across cultures and centuries, breath has been the central tool of contemplative practice.

Cross-Cultural Breath Wisdom

Pranayama (India): The classical yoga system describes prana as life-force energy carried by the breath. Pranayama practices like nadi shodhana (alternate nostril breathing), kapalabhati (skull-shining breath), and bhramari (humming bee breath) were developed to purify nadis (energy channels), balance the hemispheres, and prepare the practitioner for deeper meditative states. Modern neuroscience maps several of these effects to measurable changes in HRV, brain oxygenation, and EEG patterns.

Tummo (Tibet): Tibetan Buddhist tummo practice uses breath, visualisation, and muscular locks (bandhas) to generate inner heat and enter states of heightened awareness. Studies of advanced practitioners have documented dramatic physiological changes during tummo, including significant increases in body temperature and EEG patterns consistent with deep meditative absorption.

Zikr (Sufism): Sufi dhikr practices use rhythmic breath coordinated with divine names and physical movement to produce states of spiritual absorption and ecstatic clarity. The rhythmic patterning of breath and movement creates physiological conditions (HRV increases, brainwave entrainment) that modern researchers recognise as overlapping with flow.

Taoism: Taoist breathing practice (tu na) emphasises soft, slow, abdominal breathing coordinated with qi cultivation. The instruction to breathe "like a sleeping infant" reflects an intuitive recognition of the parasympathetic-dominant state as the platform for health and awareness.

What is notable is not just that these traditions used breath deliberately, but that they were precise about it. They specified rhythms, ratios, postures, and intentions. This level of precision mirrors what modern research now produces through controlled experiments. The underlying truth was accessible through careful observation long before the equipment to measure it existed.

For practitioners interested in the classical system in greater depth, the pranayama exercises article provides a structured introduction to the major techniques from the Indian tradition. The advanced pranayama and bandhas article covers the energetic locks that amplify breathwork effects in traditional practice.

Common Mistakes That Block Flow Through Breathwork

Many people try breathwork once or twice, feel a small effect, and then abandon it because it does not produce the dramatic state shift they hoped for. Usually, the problem is not the technique itself but how it is being applied.

Breathing Too Hard

More effort does not mean more benefit. Forced, effortful breathing activates the sympathetic nervous system and works against the calm-alert state you are trying to create. All the calming techniques described in this article work best with a light, gentle breath, even during the cyclic sighing double-inhale. Think of filling a balloon slowly rather than blowing up a rigid tube.

Using the Wrong Technique for the Moment

If you are already highly activated and stressed, jumping straight into coherent breathing can feel frustrating and ineffective. Start with cyclic sighing to discharge the accumulated tension first. Then move into a slower pattern once the body has calmed. Similarly, if you are flat and fatigued, a gentle activating sequence is more useful than a deeply calming one.

Stopping Too Soon

Five minutes feels like a long time when you are new to a sitting practice. Most people stop before the physiological shift has fully occurred. The research showing benefits from cyclic sighing and coherent breathing used sessions of at least five minutes. Build the habit before judging the results.

Not Protecting the State Afterward

You can complete a perfect breathwork session and then immediately check your phone and dissolve every benefit. The nervous system state you build through breathwork is real, but it is not armoured against sharp context switches. Protect the window of calm alertness by moving directly into focused work without distraction.

Neglecting the Exhale

Most people pay attention to the inhale and rush or neglect the exhale. The exhale is where most of the calming action happens. A longer, more complete exhale activates the parasympathetic nervous system more strongly than any adjustment to the inhale. Practising a full, slow exhale that empties the lungs is the single most accessible improvement most people can make to their baseline breathing pattern.

Your Breath Is Your Greatest Untapped Performance Tool

You have been breathing your entire life without thinking about it. That same automatic process, brought into conscious awareness and directed with intention, becomes one of the most precise instruments you have for shaping your mental state. Flow is not a gift reserved for elite athletes or artistic geniuses. It is a neurological state with reliable physiological preconditions. Breathwork gives you direct access to those preconditions.

Start small. Five minutes of cyclic sighing before your most important work of the day. Notice what changes. Build from there. The research is clear, the traditions are consistent, and the practice asks very little of you. Your next great session of focused work might be just a few conscious breaths away.

For a complete morning protocol that pairs breathwork with other peak-state practices, visit the morning breathwork guide. To explore the deeper meditative states that breathwork can prepare you for, see the meditation guide on Quantum Codex.

What is breathwork for flow state?

Breathwork for flow state is the deliberate use of breathing patterns to shift your nervous system and brain chemistry into conditions that support deep, effortless concentration. Techniques like cyclic sighing, box breathing, and coherent breathing lower cortisol, raise nitric oxide levels, and synchronize brainwave activity to support the alpha-theta border associated with flow.

How long does breathwork take to induce a flow state?

Most people notice a shift toward focused calm within 5 to 10 minutes of deliberate breathwork. Techniques like the 4-7-8 pattern or cyclic sighing can produce measurable changes in heart rate variability and perceived stress within a single session. Deeper flow states involving time distortion and effortless performance typically emerge after 15 to 30 minutes of sustained practice.

What breathing pattern is best for flow state?

Coherent breathing at a rate of 5 to 6 breaths per minute is one of the most well-researched patterns for inducing flow-supportive states. Box breathing (4 counts in, hold, out, hold) is widely used for quick nervous system reset. Cyclic sighing, which involves a double inhale through the nose followed by a long exhale, has shown the strongest single-session improvements in mood and calm in recent Stanford research.

Can breathwork replace meditation for flow state?

Breathwork and meditation work through overlapping but distinct pathways. Breathwork produces faster physiological changes, making it effective as a pre-performance primer. Meditation tends to build the baseline mental clarity and equanimity that makes flow easier to access over time. Many practitioners combine both: a short breathwork session to settle the nervous system, followed by focused work or meditation.

What happens in the brain during flow state?

During flow state, the prefrontal cortex undergoes transient hypofrontality, meaning it becomes less active. This quiets the inner critic and reduces self-monitoring. Alpha and theta brainwaves increase, particularly at the border between the two. Norepinephrine, dopamine, anandamide, and serotonin all rise, producing the feelings of focus, pleasure, and timelessness characteristic of flow.

Is breathwork safe for inducing flow state?

Most breathwork practices used for flow induction are safe for healthy adults when done seated or lying down. Hyperventilation-based techniques like holotropic breathwork should only be done under guidance, and are not recommended for people with cardiovascular conditions, epilepsy, recent surgery, or pregnancy. Slower, regulated breathing techniques like box breathing and coherent breathing carry minimal risk for healthy individuals.

How does CO2 affect flow state through breathing?

Carbon dioxide plays a central role in regulating brain oxygenation and blood vessel dilation. When we breathe too fast, CO2 drops and blood vessels constrict, reducing oxygen delivery to brain tissue. When we slow the breath intentionally, CO2 rises to healthy levels, arteries dilate, and the brain receives better-oxygenated blood. This physiological shift supports the calm alertness that underpins flow state.

What is cyclic sighing and why does it work for flow?

Cyclic sighing involves a double inhale through the nose (a normal inhale, then a second short sniff to fully inflate the lungs) followed by a long, slow exhale through the mouth. A 2023 Stanford study published in Cell Reports Medicine found this pattern reduced anxiety and improved mood more than other breathing techniques and mindfulness meditation in five-minute sessions. It works by rapidly deflating alveoli, expelling CO2 efficiently, and activating the parasympathetic nervous system.

Can I use breathwork before athletic performance to reach flow?

Yes. Many elite athletes use structured breathwork as part of their pre-competition routine. Techniques like the Wim Hof method are used to alkalise the blood temporarily and boost adrenaline for explosive performance. Coherent breathing and box breathing are better suited for precision sports requiring calm focus. The key is matching the breathwork style to the type of performance state you need.

How does breathwork connect to ancient traditions around peak states?

Deliberate breathwork for altered and peak states appears across many traditions. Pranayama in yoga, tummo breathing in Tibetan Buddhism, and rhythmic breath practices in Sufi Zikr are all examples. These traditions recognised centuries ago that breath is a bridge between the automatic body and the conscious mind. Modern neuroscience is now mapping the physiological mechanisms behind what these traditions discovered through direct experience.

Sources and References

  • Balban, M.Y., Neri, E., Kogon, M.M., Weissberg, L., Desai, S., Li, T., Huberman, A.D. (2023). Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine, 4(1), 100895. https://doi.org/10.1016/j.xcrm.2022.100895
  • Csikszentmihalyi, M. (1990). Flow: The Psychology of Optimal Experience. Harper and Row.
  • Lehrer, P.M., Vaschillo, E., Vaschillo, B. (2000). Resonant frequency biofeedback training to increase cardiac variability. Applied Psychophysiology and Biofeedback, 25(3), 177-191.
  • Lagos, L., Vaschillo, E., Vaschillo, B., Lehrer, P., Bates, M., Pandina, R. (2008). Virtual reality-assisted heart rate variability biofeedback as a strategy to improve golf performance. Journal of Applied Sport Psychology, 20(2), 184-195.
  • Kotler, S. (2014). The Rise of Superman: Decoding the Science of Ultimate Human Performance. New Harvest.
  • Lundberg, J.O., Farkas-Szallasi, T., Weitzberg, E., Rinder, J., Lidholm, J., Anggaard, A., Hokfelt, T., Lundberg, J.M., Alving, K. (1995). High nitric oxide production in human paranasal sinuses. Nature Medicine, 1(4), 370-373.
  • Jevning, R., Wallace, R.K., Beidebach, M. (1992). The physiology of meditation: A review. A wakeful hypometabolic integrated response. Neuroscience and Biobehavioral Reviews, 16(3), 415-424.
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