therapies · education ·
Hard Chamber Or Soft? The Best One Is The One You Can Actually Get To
Our position, stated as a position. Both pressures do real work, they do different work, and only one kind of chamber can reach the whole range.
Most of what is written about hard versus soft chambers is written by somebody selling one of them.
So here is ours, with the selling interest declared up front: True Health Solutions owns a hard chamber. That is a position, not a neutral survey, and the rest of this article is built so you can separate what is measured from what we think.
First, the thing we would say even if it cost us
The best chamber is the one you have access to.
Not the one with the best specification sheet. Not the one a clinic two hours away owns. The one you will actually get into, repeatedly, for the number of sessions that matters.
The strongest hyperbaric trial we know of used forty sessions across eight weeks and found the benefit got clearer in people who completed more than thirty-five of them. Whatever else is true, a protocol like that is defeated by distance, cost and inconvenience long before it is defeated by pressure.
If a soft chamber in a spare room is what you can reach and afford, and a clinic is not, then the soft chamber is the better chamber for you. We would rather say that plainly than sell you something you will use four times.
What is actually measured
Three things, and they pull in different directions. All three belong in the argument.
Higher pressure delivers more oxygen to tissue. In 130 chronic ulcer patients breathing 100% oxygen, tissue oxygen averaged 161 mmHg at 1.4 atmospheres against 333 mmHg at 2 atmospheres (Sack et al., Undersea and Hyperbaric Medicine, 2024). Those same authors wrote that they found no evidence 1.4 ATA benefits a chronic ulcer patient. For that problem, at that pressure, they are the best evidence available.
Lower pressure is not inert. Ten healthy adults at 1.27 atmospheres breathing ordinary room air, no oxygen at all, showed circulating stem progenitor cells rise roughly two-fold by the ninth exposure and roughly three-fold 72 hours after the final one (MacLaughlin et al., Frontiers in Neurology, 2023). Ten people is ten people. But those authors make a sharp point: trials that used hyperbaric air as a placebo may have been comparing one dose against another rather than treatment against nothing.
There is a mechanism for why pressures might differ in kind, not just in amount. It is called the hyperoxic-hypoxic paradox. Cells read the fluctuation in free oxygen rather than the absolute level, so repeated intermittent hyperoxia can induce many of the same mediators that hypoxia does, including stem cell proliferation, migration and differentiation (Hadanny and Efrati, Biomolecules, 2020).
That last one matters for this argument. If the trigger is the swing rather than the ceiling, then different pressures are not simply stronger and weaker versions of the same signal.
Our position, and it is a position
Everything below this line is opinion, informed by the above and by practice. Read it as conviction, not as data.
We think hyperbaric oxygen, across its range of pressures, is one of the most useful tools available for supporting the body’s own repair. That is a belief about a mechanism we find compelling, and it is not a claim that it treats, cures or prevents any condition.
We chose a hard chamber for one reason, and it is not that soft chambers do not work.
A hard chamber can do low pressures. A soft chamber cannot do high ones. Owning the hard chamber is owning the whole range.
Scott Wise, True Health Solutions
That is the entire argument, and it is an argument about optionality rather than superiority.
If the useful dose for a given person and a given goal sits at the low end, a hard chamber runs low pressures perfectly well. If it sits at the top, a soft chamber simply cannot get there. One of those two tools can be wrong for the job. The other can always be dialled to meet it.
People respond differently, and that is the practical case for range. Bodies are not identical, and the assumption that one fixed pressure is correct for everybody is an assumption made by equipment, not by physiology. Being able to move the dose is how you find what a particular person responds to, rather than hoping the one setting you own happens to be the right one.
Where we are careful
We cannot yet show you the study we would most like to show you. Work on how different oxygen pressures affect gene regulation, cytokines and cell regeneration is underway, including a 2025 doctoral dissertation from the University of Miami on exactly this question. A dissertation is not a peer-reviewed, indexed trial, and we have not seen its figures. When that work is published and we can read the data, we will write it up properly rather than paraphrase it now.
We are not claiming hard chambers produce better outcomes than soft ones in a head-to-head trial, because as far as we can find, nobody has run one. What we are claiming is narrower and, we think, harder to argue with: a tool that covers the whole range can be matched to the goal, and a tool that covers part of it cannot.
And the absolute rule stands regardless of chamber. An untreated pneumothorax is an absolute contraindication, and ear and sinus risk needs screening. No pressure, high or low, changes that.
Where the design shows up
Oxygen has a narrow therapeutic window. Too little and metabolism fails. Too much, for too long, is its own problem. The body is tuned to a range rather than a maximum.
There is something fitting in the fact that the honest answer here is not more, but the right amount, for this person, for this purpose. That is closer to how a body works than any specification sheet.
“He has made everything appropriate in its time.” Ecclesiastes 3:11, NASB
The verse carries the conviction. The measurements above carry what is currently known, which is less than either side of this argument usually admits.
What to do this week
If you are choosing: ask what pressure range the unit can reach, and do not let anybody skip the question.
If you are choosing between a soft chamber you can use daily and a hard chamber you cannot reach, choose the one you will use. Access beats specification every time, and a protocol you never complete is worth nothing at all.
And if somebody tells you their chamber is the only one that works, ask them what they sell.
Read this next: the evidence half of this pair, including the double-blind wound trial and what tissue oxygen actually measures at each pressure: does hyperbaric oxygen actually work. For how we grade evidence when the literature is this contested, two of medicine’s top editors say you can’t believe much of it.
Sources
- Hadanny A, Efrati S. “The Hyperoxic-Hypoxic Paradox.” Biomolecules, 2020;10(6):958. https://pubmed.ncbi.nlm.nih.gov/32630465/
- Sack RA, Pikkel YY, Shemy OL, Ramon Y, Ullmann Y, Zeltzer AA. “Transcutaneous oximetry values in chronic ulcer patients during hyperbaric treatment at 1.4 ATA compared to 2 ATA.” Undersea and Hyperbaric Medicine, 2024;51(1):1-5. https://pubmed.ncbi.nlm.nih.gov/38615347/
- MacLaughlin KJ, Barton GP, Braun RK, et al. “Hyperbaric air mobilizes stem cells in humans; a new perspective on the hormetic dose curve.” Frontiers in Neurology, 2023;14:1192793. https://pubmed.ncbi.nlm.nih.gov/37409020/
Article metadata retrieved from PubMed. Photograph from Pexels. Scripture quoted from the New American Standard Bible.
This article contains opinion, clearly marked as such, alongside cited evidence. True Health Solutions owns a hard chamber, which is disclosed above. Educational content only: we do not diagnose or prescribe, and nothing here is a substitute for care from someone who knows your history.
Questions people ask
- Is a hard chamber better than a soft chamber?
- Our view is that it is more capable rather than simply better, and the reason is range. A hard chamber can run low pressures as well as high ones. A soft chamber cannot go high. If the right dose for a given goal turns out to be at the top of the range, only one of them can get there.
- So are soft chambers a waste of money?
- No, and we would argue against anyone who says so. The best chamber is the one you actually have access to and will actually use. Ten sessions in a soft chamber in your spare room beat forty sessions in a clinic two hours away that you never attend.
- Do low pressures do anything at all?
- Yes. In ten healthy volunteers at 1.27 atmospheres on plain room air, not oxygen, circulating stem progenitor cells roughly doubled by the ninth exposure and roughly tripled 72 hours after the last one. That is a small study, and it is not nothing.
- Why would different pressures do different things?
- The mechanism is called the hyperoxic-hypoxic paradox. Cells respond to the fluctuation in oxygen rather than the absolute level, so intermittent hyperoxia can trigger many of the same repair signals that low oxygen does. Different fluctuations plausibly recruit different responses.
- Is this article evidence or opinion?
- Both, kept apart on purpose. The mechanism and the measurements are cited. The conclusion about which chamber to own is our position, and it is labelled as one.
