Peak oxygen uptake in stroke survivors has been measured at a quarter to nine-tenths of what would be expected, and remains 25 to 45% below expected six months on. That is not the stroke damaging heart and lungs.
Here is a figure that ought to be better known.
Stroke survivors — including people with only mild impairments — have been measured with peak oxygen uptake somewhere between roughly a quarter and nine-tenths of what would be expected for their age and sex. Six months or more after the event, fitness commonly remains 25% to 45% below the expected value.
That is not the stroke damaging the heart and lungs. That is what happens to a body that stops moving.
The sequence is depressingly logical.
A stroke reduces someone’s ability to move. Reduced movement reduces cardiorespiratory fitness. Reduced fitness makes everything effortful, which reduces movement further. More than one in five people experience a decline in mobility within the first year after stroke, and the primary driver is physical inactivity rather than the stroke itself.
Layered on top is post-stroke fatigue, which affects around half of survivors and is one of the symptoms they consistently rate as most difficult to live with. Low cardiorespiratory fitness is a recognised contributor. So fatigue discourages activity, inactivity lowers fitness, and lower fitness worsens fatigue.
The important thing about a spiral is that it can be entered at any point — which also means it can be interrupted at any point.
The 2020 Cochrane review of physical fitness training for stroke survivors pooled 75 studies and just over 3,000 participants, comparing cardiorespiratory training, resistance training and mixed training against usual care or no intervention.
The clearest findings:
That last point matters more than it looks. Fear — the survivor’s, and often the family’s — is one of the biggest barriers to activity after stroke. The evidence does not support that fear.
I want to be as clear about the gaps, because they are substantial and they get glossed over.
Mood, quality of life and cognition are under-evidenced. There was not enough data to draw conclusions on any of them. Cognitive function in particular is badly under-investigated, despite being one of the outcomes survivors care most about. Anyone claiming exercise reliably improves cognition after stroke is going beyond what has been shown.
Whether benefits persist after training stops is unclear. Some mobility benefits appeared to hold. Beyond that, the data are thin.
Mortality and dependency cannot be assessed. Too few deaths occurred across the trials to say anything about whether exercise reduces them.
Most participants could already walk independently. This is the limitation that most needs stating plainly, because the people most likely to read an article like this hopefully are often the ones with more severe impairment. The evidence base largely does not cover them. More studies in that group are needed, and until they exist, nobody should be extrapolating confidently.
The single most important thing after a stroke is reducing the risk of another one, and almost all of that is medical.
Blood pressure control. Antiplatelet or anticoagulant therapy. Detecting and treating atrial fibrillation. Lipid management. Diabetes control. Smoking cessation. Carotid assessment where indicated.
These have strong evidence and they belong entirely with your stroke team and GP. No nutritional protocol substitutes for any of them, and any practitioner who suggests reducing or stopping stroke prevention medication is putting you at risk of the exact event you are trying to avoid.
That is not a caveat tacked on the end. It is the first thing that should be said, and it is why the rest of this article is deliberately narrow.
Capacity, measured and rebuilt. Nobody is measuring what happened to a survivor’s fitness and strength after discharge from stroke rehabilitation, because the service ends and nothing takes over. Walking capacity, endurance, strength, and confidence are all trackable and all modifiable, and the Cochrane evidence supports walking-based training as the best-supported approach.
Sarcopenia and protein. Muscle loss after stroke is common and is driven by reduced activity, inadequate intake, and often by swallowing difficulties that make eating slow and tiring. Protein requirements go up when muscle is being rebuilt, at exactly the point when many people are eating less. This is unglamorous, addressable, and frequently unaddressed.
Nutritional status generally. Appetite changes, low mood, fatigue, altered taste, and the practical difficulty of preparing food one-handed all conspire against adequate intake. Deficiency states that would matter in anyone matter more in someone trying to rebuild.
Falls. Reduced strength, altered balance and fear of falling combine into a genuine risk, and the consequences of a fall in this group are serious. Strength and balance work is prevention.
Fatigue. Not by claiming to cure it — post-stroke fatigue is multifactorial and poorly understood — but by addressing the contributors that are modifiable: fitness, sleep, nutrition, and the pacing of activity across a week.
If you or someone with you develops sudden face drooping, arm weakness, or speech difficulty, that is 999. Immediately. Symptoms that resolve within minutes still need urgent assessment — a TIA is a warning, and the risk of a full stroke is highest in the days that follow.
New or worsening symptoms of any kind after a stroke are a medical question, not an exercise question.
Much of the disability people carry in the years after a stroke is not the stroke. It is deconditioning — and deconditioning is the one part of the picture that reliably responds to work.
The evidence for walking-based fitness training after stroke is reasonable and it is safe. The evidence for it improving mood, cognition or survival is not yet there. The medical prevention of a second stroke is not mine to touch.
What is left is still worth doing: rebuilding capacity in the years after everyone else has stopped looking. That is a modest claim, and it happens to describe the largest unaddressed part of the problem.
This article is general information and not medical advice. Stroke care and medication decisions belong with your stroke team or GP.
Sources
Saunders DH, Sanderson M, Hayes S, Johnson L, Kramer S, Carter DD, Jarvis H, Brazzelli M, Mead GE. Physical fitness training for stroke patients. Cochrane Database of Systematic Reviews 2020;3:CD003316.
Data on post-stroke VO2 peak reduction and mobility decline as summarised in the systematic review literature on chronic-phase stroke fitness, including Cochrane CD003316 and subsequent meta-analyses.
Walking capacity, strength and confidence are trackable and modifiable, long after rehabilitation ends.
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