Breath, Pain and the Body’s Chemistry

What the Emerging Science of Conscious Connected Breathing Is Beginning to Show

I’ve been sitting with the growing conversation around conscious connected breathing and breath retention for a while now. As a clinician working with trauma and persistent pain, I’m always interested in practices that appear powerful… but I’m equally interested in what the science genuinely supports. Breath is intimate. It’s immediate. And when we change it, something shifts. The question is: what exactly is shifting?

Over the past few years, conscious connected breathing (CCB), sometimes combined with breath retention, has begun moving from retreat spaces into research labs.

That alone is interesting.

Breath is not just symbolic. It is biochemical. It is neurological. It is immunological. When we alter the way we breathe, we alter the internal environment of the body.

But as with anything that gathers momentum quickly, it feels important to gently separate emerging science from enthusiastic interpretation.

The Chemistry of Connected Breathing

Conscious connected breathing typically involves breathing continuously without pause between inhale and exhale. Often the breaths are deeper, sometimes faster, than resting breathing.

Physiologically, this reduces carbon dioxide (CO₂) in the blood. When CO₂ drops, blood pH shifts in an alkaline direction, known as respiratory alkalosis. This shift influences cerebral blood flow and neural signalling (Jerath et al., 2006; Zaccaro et al., 2018).

More recent research measuring end-tidal CO₂ during circular breathing has shown that reductions in CO₂ correlate with the intensity of altered subjective experiences. In other words, the physiological shift is measurable, and it aligns with what people report feeling.

For those of us working with persistent pain and trauma, that’s meaningful.

CO₂ levels influence threat detection.

Cerebral blood flow influences sensory processing.

Interoception shifts when breathing shifts.

Breath becomes a doorway into state change.

Breath Retention: Stress, on Purpose

When breath retention is added, holding the breath after an exhale, the physiology shifts again.

CO₂ begins to rise.

Air hunger builds.

Sympathetic activation increases.

Stress hormones such as epinephrine may transiently elevate.

Research into breathing protocols combining hyperventilation and retention (Kox et al., 2014; Zwaag et al., 2020) demonstrates that this pattern can influence immune signalling under controlled laboratory conditions. In experimental settings, anti-inflammatory cytokines increased while pro-inflammatory responses were attenuated.

That is genuinely interesting.

It suggests that deliberate respiratory stress can interact with immune function. It also aligns with broader research on hormesis, the idea that brief, contained stress exposure can support adaptive resilience (Mattson, 2008).

What it does not yet show is guaranteed “cellular regeneration” or consistent mitochondrial repair in clinical populations.

The current evidence supports modulation, sadly not miracle (yet),

And that distinction strengthens rather than weakens the field.

Where Pain Fits In

Breathing and pain are intimately connected.

A systematic review by Jafari et al. (2017) highlighted the bidirectional relationship between respiration and pain processing. Slower breathing interventions have demonstrated improvements in autonomic balance and pain perception (Busch et al., 2012; Zautra et al., 2010).

When it comes specifically to conscious connected breathing with retention, research in chronic pain populations is still emerging. A recent pilot randomised study in chronic low back pain (Pratscher et al., 2023) examined feasibility and acceptability. Early indications suggest the intervention is workable and well-tolerated, but we do not yet have large, definitive efficacy trials.

It feels important to hold that gently.

The work is beginning. It is promising. But it is still unfolding.

A Careful Conversation About “Cellular Transformation”

Breathing absolutely affects the cellular environment:

• CO₂ regulates acid–base balance

• Acid–base balance influences enzyme activity

• Stress hormones affect immune cell behaviour

• Oxygen dynamics influence mitochondrial metabolism

There is also research suggesting intermittent hypoxia can produce adaptive cellular responses in certain contexts (Faull et al., 2019; Maric et al., 2020).

However, at present, there is no strong clinical evidence demonstrating that weekly sessions of conscious connected breathing regenerate mitochondria in people with chronic illness.

That doesn’t mean nothing profound is happening.

It means the science currently supports signalling shifts and physiological modulation rather than structural regeneration.

And that is still powerful.

Where This Connects Deeply With Trauma and Persistent Pain

For me, the most compelling aspect of conscious connected breathing isn’t cellular language.

It’s nervous system flexibility.

Breath retention creates rising internal pressure.

The urge to escape.

The impulse to override discomfort.

The familiar activation that once signalled danger.

And then, the possibility of staying.

In trauma physiology, safety isn’t the absence of activation. It’s the capacity to tolerate activation without collapse or panic.

From this lens, breathwork becomes:

• CO₂ tolerance training

• Interoceptive exposure

• Autonomic flexibility practice

• Safe stress rehearsal

It may temporarily shift cortical dominance and increase emotional accessibility. It may open material. It may soften protective layers.

But it is not the same mechanism as EMDR.

It is its own practice, with its own physiology and potential.

A Balanced Position

The emerging research tells us:

Breathwork alters CO₂ and pH.

Breath retention activates stress pathways.

Stress hormones and immune signalling can shift.

Subjective experiences correlate with measurable physiological changes.

That is meaningful.

What it does not yet tell us is that there is a single required dose, or that structural cellular transformation is guaranteed.

Breath is powerful because it is immediate and embodied.

And when delivered thoughtfully, screened appropriately, titrated carefully, and held within containment, conscious connected breathing may become a valuable adjunct in pain and nervous system work.

We are still mapping the terrain.

And perhaps that’s where the real integrity lies, in staying curious, grounded, and open as the science catches up with lived experience.

References

Busch, V. et al. (2012). The effect of deep and slow breathing on pain perception. Pain Medicine, 13(2), 215–228.

Faull, O.K. et al. (2019). The periaqueductal gray and breathing. Neuroscience & Biobehavioral Reviews, 98, 135–144.

Jafari, H. et al. (2017). Pain and respiration: A systematic review. Pain, 158(6), 995–1006.

Jerath, R. et al. (2006). Physiology of long pranayamic breathing. Medical Hypotheses, 67(3), 566–571.

Kox, M. et al. (2014). Voluntary activation of the sympathetic nervous system and attenuation of the innate immune response. PNAS, 111(20), 7379–7384.

Mattson, M.P. (2008). Hormesis defined. Ageing Research Reviews, 7(1), 1–7.

Pratscher, S.D. et al. (2023). Conscious connected breathing with breath retention intervention in chronic low back pain: Protocol for a pilot RCT. Pilot and Feasibility Studies, 9:15.

Zaccaro, A. et al. (2018). Psycho-physiological correlates of slow breathing. Frontiers in Human Neuroscience, 12:353.

Zautra, A.J. et al. (2010). Slow breathing and affective pain responses. Pain, 149(1), 12–18.

Zwaag, J. et al. (2020). Lactate and pyruvate in anti-inflammatory effects of sympathetic activation. Metabolites, 10(4), 148.