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The Nervous System Was Never New

Right now, if you scroll through any wellness feed, you’ll see the same word surfacing everywhere: regulation. Nervous system regulation. Vagal toning. Neurowellness. Somatic release. HRV scores. Cold plunges as biohacks. The wellness industry has declared 2026 the year of the nervous system, and Vienna — a city that has never met a trend it didn’t eventually put on a menu — is catching up fast.

I want to talk about this. Not because I think you need another explainer on the vagus nerve (though we’ll get there), but because I think there’s something worth naming about how this conversation is happening, and what it leaves out.

What’s actually being “discovered”

Here’s what the neuroscience says, roughly: your autonomic nervous system has two main modes — sympathetic (fight, flight, go, go, go) and parasympathetic (rest, digest, repair). The vagus nerve is the main highway of the parasympathetic branch, running from your brainstem down through your throat, lungs, heart, and gut. Stimulate it — through slow exhalation, humming, cold exposure, certain kinds of touch, certain kinds of movement — and you shift your whole physiology toward calm.

I want to be careful here, because it’s tempting to say this is simply Pranayama, or the Daoist attention to Qi moving through the meridians, wearing a lab coat. That’s not quite honest. The vagus nerve is a specific, mapped structure; Western cardiology and neuroscience built their own real body of research to find it, name it, and measure it — people like Stephen Porges, working from an entirely separate lineage than the one I teach from. That work deserves its own credit, not a footnote under “the East knew this all along.”

What I do think is true is narrower, and I think it still matters: the practices that reliably move a body from fight-or-flight into rest-and-repair — slow exhalation, chanting, humming, certain movement, certain stillness — were mapped and used with enormous precision by contemplative traditions long before anyone had a name for the vagus nerve. And I mean precision literally, not as a figure of speech. The Yoga Sutras and later the Hatha Yoga Pradipika don’t just say “breathe slowly” — they specify inhale-hold-exhale ratios, which nostril to favor, which technique to use for which mental state: one pattern to calm, another to energize, centuries of trial mapped onto the body without a single sensor. The Huangdi Neijing, China’s foundational medical text, was linking breath, emotion, and organ function into one integrated system around 200 BCE. TCM’s pulse diagnosis and the yogic practice of reading breath patterns were ways of assessing something very close to nervous system state — without instruments, without a wearable, just trained attention repeated across generations. That’s not a vague spiritual claim. It’s a protocol, refined over an enormous span of time, often more specific than what shows up in this year’s breathwork app.

Pranayama and TCM’s attention to the meridians weren’t describing the same mechanism the science now describes. But they were pointing, from a completely different framework, at the same body doing the same thing, with a level of applied detail that predates the vagus nerve’s name by well over a thousand years. Two lineages, arriving at overlapping ground from different directions, is a different claim than “it’s all just Pranayama with better marketing” — and I think it’s the more honest one.

The research, if you want to check my work

I don’t like making claims like this without showing where they come from, so here’s the actual state of the evidence, as far as I can tell it.

Stephen Porges laid out polyvagal theory in 1995, and has kept refining it since, it’s the framework behind almost everything you’re hearing right now about “vagal tone” and nervous system safety. I want to be much more specific than I was above about what “contested” actually means here, because it matters. As recently as this year, Paul Grossman and thirty-eight co-signing researchers in neurophysiology and vagal anatomy published a formal challenge to the theory’s core biological claims,  arguing that the two vagal pathways Porges treats as functionally distinct aren’t as separable as the theory requires, and that respiratory sinus arrhythmia, the actual heart-rhythm measurement most “vagal tone” claims rest on, may not capture what the theory says it captures. Porges has pushed back hard, and the debate is genuinely unresolved as I write this — not a fringe objection, a live dispute among the people who study this for a living.

There’s a second, quieter problem worth naming alongside that one: even people sympathetic to Porges tend to agree that his actual, testable claims are narrow – specific vagal branches, specific measurable outputs, tested in controlled conditions. What’s ballooned in the years since is the popular use of “polyvagal” as an all-purpose explanation for trauma, safety, attachment, and social behavior — a scope far beyond what the narrow neurophysiology was ever built to carry. That gap between a modest finding and a sweeping brand is, I’ll admit, exactly the pattern I’m criticizing in the rest of this piece. The science itself isn’t immune to the same move the wellness industry keeps making.

What’s much better established, separately from the theory itself, is the narrower and more testable claim: that heart rate variability (HRV) is a real, measurable index of parasympathetic activity, and that specific practices reliably shift it.

On the yoga side specifically, a comprehensive review of 59 studies covering over 2,300 participants found that yoga practice increases HRV and vagal dominance, and that regular practitioners have higher resting vagal tone than non-practitioners. A separate meta-analysis of randomized controlled trials on yoga and tai chi found the same pattern along with reductions in perceived stress. And on breath specifically, a 2025 review of slow, nasal, diaphragmatic breathing found consistent improvements in vagal tone and HRV, alongside reduced cortisol and anxiety, across the studies it examined.

None of this proves the ancient framework was “right” in the way modern physiology is right,  that’s a category error I don’t want to make on either side. What it does show is that the practices themselves hold up under scrutiny, independent of which vocabulary you use to describe why.

Who gets left out of the story

Even with that correction, something still bothers me about how this trend gets sold. Most of the marketing around “neurowellness” like the wearables, the biohacking language, the breathwork-as-productivity-tool framing, doesn’t claim to be reinventing yoga or TCM. It mostly doesn’t mention them at all. That’s actually the more precise problem, and I think it’s worth naming instead of the louder, easier accusation. It’s not that the wellness industry stole this and rebranded it. It’s that it built a whole vocabulary — regulation, vagal toning, HRV — around practices that traditions have been refining for millennia, without once turning to ask what those traditions already learned. That’s a quieter kind of erasure than theft, but it’s erasure all the same: not claiming credit for the wisdom, just proceeding as if it never existed.

Why it’s landing so hard right now

I don’t think this trend is arbitrary. Vienna in 2026 is a city of overstimulated nervous systems: notifications, commutes, a housing and cost-of-living conversation that never quite settles, a news cycle that asks something of you every single day. “Wired and tired” isn’t a slogan, it’s a diagnosis a lot of us are walking around with. So when something offers a felt, immediate sense of down-regulation like a long exhale, a held breath, a hum in the chest, of course it spreads. The body is asking for the thing it’s always needed, and finally there’s a vocabulary, however incomplete, for asking back.

I’ll admit there’s an irony I can’t fully write my way around: I’m making an argument about slowing down and paying attention to old knowledge, on a blog, competing for your attention against the very feed I opened this piece describing. I don’t have a clean way out of that. Maybe the only honest thing to do with that irony is name it and let you sit with it, the way I’d ask you to sit with a held breath — a little uncomfortable, not needing to be resolved right away.

Further reading, for anyone who wants to go further than I did here:

  • Porges, S. W. (1995). Orienting in a defensive world: Mammalian modifications of our evolutionary heritage. The foundational polyvagal theory paper.
  • Grossman, P. et al. (2026). Fundamental challenges and likely refutations of the five basic premises of polyvagal theory — the 39-researcher critique of PVT’s core neuroanatomical claims, and the ongoing rebuttals from Porges and others responding to it.
  • Tyagi, A. & Cohen, M. (2016). Yoga and heart rate variability: A comprehensive review of the literature. International Journal of Yoga.
  • Systematic review and meta-analysis of Tai Chi/Yoga effects on HRV parameters and perceived stress, published in Medicina (2018).
  • Narrative review of slow, nasal, diaphragmatic breathwork and its effects on HRV, cortisol, and anxiety, published in Stress and Health (2025).
  • For the older lineage: the Hatha Yoga Pradipika (~15th century) on pranayama ratios and technique-to-state mapping, and the Huangdi Neijing (~200 BCE) on the integrated model linking breath, emotion, and organ function.