Intensive breathwork reduces brain blood flow 45%, triggers psychedelic-like altered states

Thirty people sat inside an MRI machine and breathed hard. Not the steady, measured breathing of meditation, but intensive, high-ventilation breathing—the kind that makes your chest work and your mind spin. What the researchers watching the scans discovered was striking: as these experienced breathwork practitioners pushed air in and out, blood flow to their brains dropped by as much as 45 percent. The numbers fell from an average of 16.24 milliliters per 100 grams of brain tissue per minute down to 9.81. That is a dramatic shift, visible in real time on the imaging screens.

But the real story was not just the numbers. The people inside the machine reported something remarkable. They described profound changes in how they perceived themselves and the world around them. Many spoke of an oceanic feeling—a sense of dissolving into something larger, of connection to the universe itself. Some said the experience resembled taking a moderate to high dose of LSD or psilocybin, though without the intense visual hallucinations those drugs typically produce. They were altered, deeply so, and they could articulate it.

The researchers, presenting their work at the ECNP Congress in Munich, faced an obvious question: Was the altered state simply a result of the reduced blood flow? The answer, it turned out, was more complicated. The brain imaging revealed that those who reported the strongest altered states showed the greatest changes not just in overall blood flow, but specifically in how their default mode network communicated. This network, which handles self-reflection and self-related thinking, appeared to be reorganizing itself. The intensity of the experience seemed to track more closely with these shifts in neural communication than with the blood flow reduction alone.

Dr. Christian Schmitz, the lead researcher from the Central Institute of Mental Health in Mannheim, Germany, noted that intensive breathwork has long been reported to produce profound shifts in perception and self-experience, yet the brain mechanisms behind these reports remained largely mysterious. "Our study suggests that these experiences are linked not only to marked changes in cerebral blood flow, but also to alterations in how key brain networks communicate," he said. The finding opens a door: if breathwork can reliably produce altered states of consciousness through measurable changes in brain function, it might become a tool for understanding consciousness itself—and potentially for treating mental health conditions.

Hana Adolphi, a co-coordinator of the research, emphasized the practical appeal. Breathwork is legal, inexpensive, and requires no drugs. It is accessible. If the mechanism could be understood and refined, it might offer a non-pharmacological route to altered states that could help people. Yet she was careful to note the study's limits. Thirty people is a small sample. All of them were already experienced with breathwork. The study was uncontrolled. These findings are preliminary, and larger, more rigorous studies will be needed to determine whether the brain changes observed have any clinical relevance or whether they can be reliably reproduced in people new to the practice.

Other researchers saw promise in the work. Dr. Guy Fincham from Brighton and Sussex Medical School noted that the study extends recent findings suggesting intensive breathing can produce altered states that people describe in ways similar to psychedelic compounds. He emphasized that such experiences might be harnessed for mental health improvement, and that an accessible non-pharmacological method like breathwork could be invaluable. But he too flagged the need for replication in people without prior breathwork experience, using randomized controlled designs, to determine whether these findings could translate more broadly and actually produce therapeutic benefit.

Professor David Nutt from Imperial College London, who has spent years researching psychedelics, saw breathwork as a bridge—a non-pharmacological way to study the mechanisms of altered consciousness that might inform the larger psychedelics research agenda. The study, in other words, sits at an intersection: it is preliminary enough to require caution, yet suggestive enough to warrant serious follow-up. The question now is whether larger, more controlled studies will confirm that breathwork can reliably produce these brain changes in people without prior experience, and whether those changes might actually help treat depression, anxiety, or other conditions where altered states have shown promise.