“You’re Just Deconditioned”

Sooner or later, someone says it.

Sometimes it is a cardiologist, four minutes into an appointment you waited five months for. Sometimes it is a relative who means well. Sometimes it is a paper you find yourself, which is worse, because a paper does not sound like an opinion.

The claim is that POTS is the consequence of inactivity. That lying down made you ill, that continuing to lie down is keeping you ill, and that the answer is to get moving.

It is worth being able to take that claim apart, because the half of it that is true is what makes the whole of it persuasive.

The part that is true

Deconditioning really is present in many people with POTS, and it is measurable.

Studies comparing people with POTS to healthy controls have found reduced blood volume and a smaller, less well-filled heart. Those are physical findings, not impressions. They are also exactly what happens to anybody who spends extended time horizontal — the effects of bed rest on the cardiovascular system have been documented for decades in people with no illness at all.

So the finding itself is not in dispute, and anyone telling you the deconditioning research is fabricated is not helping you. It is real. The question is what it means.

The part that does not follow

Finding deconditioning does not establish that deconditioning came first.

Consider what POTS does. Standing up makes your heart race, your vision gray at the edges, and your legs feel like they belong to someone else. Under those conditions, a person will be upright less. Not through any decision, and not through avoidance in the psychological sense — simply because the activity is punishing and the punishment is immediate.

Being unable to stand without your heart racing is an outstanding way to become deconditioned. Which means the measurements are equally consistent with deconditioning being a consequence of the condition rather than its cause. The data cannot tell those apart. It was never designed to.

There is a second problem. A great many people describe onset immediately following an infection, a concussion, a surgery, or a pregnancy, while they were previously active. Athletes get POTS. Someone who was running distances in March and could not stand up in June did not get there through six weeks of insufficient exercise.

And a third. Deconditioning does not produce the specific abnormalities that show up on autonomic testing. It does not damage small nerve fibers. It does not produce the hormonal patterns seen in people with low blood volume, where the systems that ought to respond by conserving salt and water do not ramp up the way they should. Those findings need an explanation that deconditioning does not supply.

Why the distinction is not academic

If you accept that deconditioning is the whole explanation, a clean conclusion follows: the treatment is exercise, and if exercise does not fix it, you did not do enough exercise.

That conclusion is where the harm lives. It converts a medical problem into a test of character, and it puts the entire burden of the outcome on the person who is ill. It also means nobody investigates the blood volume, the nerve findings, or the hormonal picture, because the cause is considered settled.

There is a real cost to that. Exercise rehabilitation is genuinely one of the better-supported non-drug approaches for POTS. But a program delivered as an accusation, to someone who has been told their illness is their own doing, is a program most people will not stay with. And when they stop, that is read as confirming the theory.

The exercise still helps

Here is the uncomfortable part, and it is worth sitting with rather than skipping.

The exercise programs work for a substantial number of people. Not everyone — some cannot tolerate them at all, particularly where post-exertional symptoms are part of the picture, and being in that group is not a failure of effort. But enough people improve meaningfully that these programs are first-line for good reason.

That does not retroactively prove the deconditioning theory. Reconditioning an ill person can help them without inactivity having been the cause of the illness. A treatment working tells you about the treatment, not about the origin.

You can accept the exercise and reject the accusation. They were never the same claim.

The question that moves an appointment along

Arguing about causation rarely gets anywhere in a fifteen-minute appointment. You will not win it, the clinician will not change their mind in the room, and you will use up the time you had.

A more useful question, once exercise has been raised:

Given that reconditioning is part of the plan, what else are we doing about the blood volume and the autonomic response?

It accepts the exercise piece without accepting that it is the whole explanation. It asks for a plan rather than a verdict. And it moves the conversation onto ground where there are actual answers — fluid and sodium targets, whether compression is worth trying, whether medication is on the table, whether a referral to someone who works with autonomic disorders is available.

You may still get a poor answer. But you will have asked a question that is difficult to dismiss, which is a different position than arguing about whether you are trying hard enough.

What we would say to you

You did not do this to yourself by resting.

You may well be deconditioned, and rebuilding is very likely part of what gets you further than you are now. Both of those can be true while the accusation is still wrong.

The distinction is worth holding onto, because the version of exercise rehabilitation that helps people is the one that starts from your circulation needs help doing its job rather than you let yourself go. Those two framings produce identical first sessions and completely different chances of anyone still being there in month four.

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Sources and further reading

• Dysautonomia International — patient and caregiver resources

• Postural orthostatic tachycardia syndrome (POTS): State of the science and clinical care from a 2019 National Institutes of Health Expert Consensus Meeting

• Adaptive Approaches to Exercise Rehabilitation for Postural Tachycardia Syndrome and Related Autonomic Disorders, Archives of Rehabilitation Research and Clinical Translation, 2024 — on adherence and dropout in existing programs

Editorial note: the cardiac research referenced in “the part that is true” is described without naming the study, per the standing decision. The nickname that finding travels under is belittling, widely resented, and naming the work invites readers to search it and find that. The finding is described accurately without it.