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Dr. Alessandro Giardini
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Exercise is the single most important long-term treatment for most children with PoTS. That statement surprises many families, particularly those whose child has been largely housebound or who have watched their teenager deteriorate after any physical effort. The surprise is understandable. It is also a sign of how poorly the evidence base for PoTS management is communicated.
The key word in that opening statement is "programme". Unsupervised, poorly timed, upright, or excessive exercise makes PoTS worse. A properly structured, progressive, predominantly recumbent exercise programme, started at the right point and advanced carefully, is one of the most powerful tools available. The difference between those two things is not subtle. It determines whether exercise becomes part of the recovery or part of the problem.
The physiological rationale is clear. Physical deconditioning, a reduction in cardiovascular fitness and blood volume that follows any period of reduced activity, is both a consequence and a driver of PoTS. A child who avoids activity because standing triggers symptoms becomes progressively less fit. Reduced cardiovascular fitness means a smaller stroke volume, lower blood volume, and a heart that has to beat faster to compensate during upright posture. That makes the PoTS worse, which reduces activity further, which worsens the deconditioning. Breaking that cycle requires deliberate and structured exercise.
Regular aerobic exercise expands blood volume, increases cardiac dimensions and stroke volume, improves the tone of the lower limb muscle pump that helps return blood to the heart during standing, and gradually reduces the compensatory tachycardia that defines PoTS. These benefits accumulate over weeks and months, not days. A child who completes three to four months of consistent reconditioning exercise is in a fundamentally different cardiovascular position from one who has not, regardless of other treatments.
This is why Dr Giardini discusses exercise at every PoTS appointment and why the exercise component of treatment is given at least as much time as the medication discussion. Tablets can help a child feel well enough to exercise. The exercise is what drives the actual recovery.
The non-negotiable principle at the beginning of any PoTS exercise programme is this: start horizontal. Upright exercise, including walking, running, standing cycling, and most gym-based activities, places the full cardiovascular challenge of PoTS directly onto the child. It provokes the very symptoms the programme is trying to treat, and starting there almost always leads to exercise being abandoned within days.
Recumbent and semi-recumbent exercise avoids the orthostatic challenge entirely. The body is horizontal or nearly so, blood does not pool in the lower limbs in the usual way, and the cardiovascular system can be worked progressively without triggering the autonomic compensation that makes upright exercise so difficult.
Swimming is the activity most consistently recommended across specialist PoTS programmes, and for good reason. It provides full cardiovascular aerobic conditioning while keeping the body horizontal, provides cooling in a condition where heat is a major trigger, and is low-impact and joint-friendly, which is particularly important for children who also have hypermobility. Starting with slow, easy lengths at whatever pace is manageable and building over weeks is the approach.
Rowing, either on water or on an ergometer, is a second excellent option. Recumbent cycling, on a recumbent bike rather than an upright one, is equally effective and particularly accessible for children who cannot easily access a pool. Supine cycling, using a specialised piece of equipment, is the starting point for children who are severely deconditioned or largely bedbound.
The published approach most commonly used in paediatric PoTS exercise programming is the modified Dallas protocol, adapted for younger patients at several specialist centres including the Children's Hospital of Philadelphia. The principle is a three-stage progression over three to four months or more.
In the first four to six weeks, exercise is entirely recumbent. The starting duration is short, sometimes as little as ten to fifteen minutes on three to four days per week, and the intensity is low enough that the child can speak comfortably throughout. The aim at this stage is not fitness. It is establishing the habit, building confidence, and demonstrating to the body that movement is safe. Heart rate targets during this phase should be discussed with Dr Giardini, as they depend on the child's resting rate and current cardiovascular status.
From six to twelve weeks, duration increases progressively to thirty minutes per session and frequency builds toward five days per week. The intensity rises toward a moderate level, with the child working harder but still able to hold a short conversation. Lower limb resistance work, such as leg press, seated leg extension, and calf raises, is added alongside the aerobic sessions. Strengthening the lower limb muscle pump is one of the most effective ways to improve venous return on standing, and this component is often neglected in programmes that focus exclusively on aerobic conditioning.
The transition to upright exercise begins only once the child has completed at least eight to twelve weeks of recumbent conditioning and is tolerating those sessions well. Walking is typically the first upright activity introduced. It should begin on flat terrain, at a comfortable pace, in cool conditions, and in the morning when hydration is at its best. Short sessions are increased gradually over weeks. Running, if desired, comes considerably later. Standing activities in warm or crowded environments remain the most challenging throughout the reconditioning process and are reintroduced last.
Progress in PoTS reconditioning is not always felt subjectively in the early weeks. A child may complete their swimming sessions, feel no obvious improvement in daily symptoms, and wonder whether it is worth continuing. This is normal and expected. The cardiovascular adaptations that matter, expanding blood volume, improving cardiac dimensions, and reducing resting heart rate, take six to twelve weeks to become clinically significant.
The most useful markers of progress are objective rather than subjective. Resting heart rate, measured first thing in the morning before getting out of bed, tends to fall gradually as fitness improves. The heart rate increase on standing, which Dr Giardini measures at each review, decreases over time with consistent training. The distance or duration achievable in a swimming or rowing session increases week on week. These are the markers to track.
A symptom diary that records exercise sessions, duration, intensity, and how the child felt during and afterwards is useful for identifying patterns. If exercise consistently produces a significant deterioration that lasts more than 24 hours, this warrants urgent discussion with Dr Giardini, because this post-exertional pattern may indicate ME/CFS overlap rather than straightforward PoTS, and the programme approach would need to change.
Upright stationary activities in warm environments remain the most reliably problematic throughout the reconditioning process. Standing still is harder than walking because the muscle pump is inactive during static standing. Hot yoga, standing weights circuits, outdoor running in summer, and prolonged upright activities in warm indoor spaces should all be avoided until recumbent conditioning is well established and upright tolerance has been demonstrated gradually.
Energy drinks, high caffeine intake, and stimulant supplements should be avoided. They can increase ectopic beats and PoTS symptoms in susceptible teenagers, and they offer no exercise benefit that outweighs that risk. Dehydration before exercise markedly worsens the orthostatic challenge, and children should drink well before, during, and after any session.
Pushing through severe symptoms during exercise is counterproductive. If a child experiences significant dizziness, visual changes, nausea, or near-fainting during a session, they should stop, lie down, and wait for symptoms to resolve before attempting anything further. This is not failure. It is appropriate pacing within the programme.
For children with significant deconditioning, or those who also have hypermobility or complex symptom pictures, a physiotherapist experienced in PoTS is an important part of the team. A well-designed physiotherapy programme complements the cardiovascular reconditioning with targeted lower limb and core strength work, proprioception training, and guidance on physical counter-manoeuvres, such as leg crossing and muscle tensing before standing, that reduce symptomatic dizziness in the short term.
Dr Giardini works with physiotherapy colleagues who understand PoTS and can design programmes that account for the individual child's current capacity, any coexisting hypermobility, and the school and home environment in which the exercise will actually take place.
The full PoTS condition guide covers the complete step-up treatment approach, of which exercise is one part alongside fluid and salt management, compression garments, and medication where needed. Exercise does not work well in isolation. It works best when the other foundations are in place.
Most families notice a gradual improvement in exercise capacity within four to six weeks, but a meaningful reduction in daily PoTS symptoms typically takes eight to twelve weeks of consistent training. The full benefit of a reconditioning programme often takes three to four months to become apparent.
For severely deconditioned children, the starting point may be as little as five to ten minutes of supine cycling or seated gentle movement on alternate days. The aim is simply to begin, not to achieve any particular level of fitness in the early sessions. Dr Giardini discusses the appropriate starting point individually based on the current functional level.
Often yes, particularly once reconditioning is established. Competitive swimming is one of the better-suited sports for teenagers with PoTS because it keeps the body horizontal and provides excellent cardiovascular training. Dr Giardini assesses each child's situation individually and does not issue blanket restrictions on competitive sport.
This requires judgement rather than a fixed rule. A bad day due to poor sleep, dehydration, or a minor virus is different from a consistent worsening of baseline function. On genuinely symptomatic days, reducing the duration and intensity of the planned session, or switching to a gentler form of movement, is preferable to complete rest. Skipping exercise entirely on difficult days can become a pattern that perpetuates deconditioning. Dr Giardini discusses individualised guidance for this decision.
The modified Dallas protocol, adapted for paediatric patients, is widely used in specialist centres and forms the basis of the approach Dr Giardini recommends. The specific targets, duration, and intensity should be discussed at the appointment and adjusted based on the child's progress at each review. A printed programme guide is available from the clinic.
Author: Dr. Alessandro Giardini, MD, PhD, Consultant Paediatric Cardiologist
Written 11/06/2026