Start here: a low-risk, evidence-backed option
Breathlessness is one of the most common and limiting long COVID symptoms, and good treatments are scarce. Inspiratory muscle training stands out because it has actual randomized trial support, is low-risk, and can be done at home with an inexpensive handheld resistance device.
The idea is simple: like any muscle, the muscles that draw breath in can be strengthened by working against resistance. Stronger breathing muscles can make breathing feel easier. Among long COVID options, having even modest controlled-trial evidence is notable, though no treatment is approved for long COVID.
RCT: breathlessness domain improvedlow-risk, home-basedprimary outcome unchanged; not a cure
How it works
The training uses a small device that you breathe in through against an adjustable resistance, for a few minutes a day. Over weeks, the diaphragm and other inspiratory muscles strengthen, much as a limb muscle would with resistance exercise.
Importantly, this is a breathing-muscle intervention, not whole-body exercise. That distinction matters in long COVID, because graded whole-body exercise can harm people with post-exertional malaise, whereas targeted, low-load breathing training is gentler and can usually be done within an energy envelope.
What the trial showed
In a randomized controlled trial of people recovering from COVID, eight weeks of inspiratory muscle training did not improve the primary overall quality-of-life score, but it did produce clinically meaningful improvements in breathlessness and chest-symptom measures, and it strengthened the respiratory muscles and improved estimated fitness.
That mixed result is the honest headline: a real, meaningful benefit for breathlessness specifically, without a change in the broad primary measure. The researchers also noted that no single strategy suits everyone, which fits the varied nature of long COVID. A meaningful share of participants dropped out, which the authors flagged as a reminder that even a gentle intervention will not suit every patient and should be matched to the individual.
Why it suits long COVID
Two features make it well matched to long COVID. It is low-load, so it is less likely to trigger the post-exertional crash that whole-body exercise can cause, and it is home-based and self-paced, so people can fit it around their limits and stop if needed. The device gives a measurable resistance that can be dialed up gradually as the muscles strengthen, so the load stays matched to what the person can tolerate rather than jumping ahead of it.
It also targets a plausible contributor to breathlessness, since breathing-muscle weakness and dysfunctional breathing patterns are common after COVID. Strengthening those muscles addresses one real part of the problem, even if it does not touch the others.
What it means for you
If breathlessness is a major symptom, inspiratory muscle training is a reasonable, low-risk option to discuss with a clinician or physiotherapist, with realistic expectations: it can ease breathlessness for many, it is not a cure, and it does not help everyone.
Because it is gentle and targeted, it is generally safer than graded whole-body exercise for people with post-exertional malaise, though it should still be introduced carefully and within your energy envelope. Judge it by whether your breathing feels easier over a few weeks.
How to read claims about it
This is a case where the evidence is genuinely positive but limited, so it should be presented honestly: meaningful for breathlessness, not a fix for long COVID as a whole. Beware sources that inflate it into a cure or, conversely, dismiss it because it missed one outcome.
The fair reading is that it is one of the better-supported, lower-risk options for a specific symptom. That is valuable in a field with few proven treatments, and it is still a long way from resolving the whole condition.
What we don't know
Honest about the edges of the evidence. These are open questions, not settled answers.
- Which patients benefit most from inspiratory muscle training.
- How long the breathlessness benefit lasts after training stops.
- Whether combining it with other approaches improves overall outcomes.
- Why it helps breathlessness without changing broader quality-of-life scores.
- The optimal training load and duration for long COVID.
- How it interacts with post-exertional malaise in the most severe patients.
What this means for you
Inspiratory muscle training is a low-risk, home-based option with real randomized-trial support for easing long COVID breathlessness, and it is gentler than whole-body exercise, making it safer for people with post-exertional malaise.
It improved breathlessness but not the trial's primary overall score, and no treatment is approved for long COVID, so treat it as a useful option for one symptom rather than a cure. Introduce it carefully within your energy envelope.
References
Each reference links to the source on PubMed, PMC, or the publisher.