Exercise lifts aerobic fitness in raised blood pressure

Raised blood pressure is usually discussed in terms of the blood pressure number itself, yet aerobic capacity is a separate and important measure of how well the heart, lungs and muscles work together. People with prehypertension or hypertension are routinely told to exercise, but it is less clear how much their fitness actually improves and which way of training delivers the most. This review set out to quantify that gain and to test which prescription parameters — how long a programme runs, how often, how long each session lasts, how much total weekly exercise, and whether a professional supervises — line up with better results.

The authors ran a systematic review and meta-analysis of randomised controlled trials, searching PubMed, Web of Science, Embase, the Cochrane Library and Scopus from inception to 24 October 2025. Fifteen studies met the inclusion criteria, all in people with prehypertension or hypertension. Results for aerobic capacity were pooled as standardised mean differences with 95% confidence intervals. The team then ran subgroup analyses splitting trials by exercise modality, programme duration, weekly session frequency, session length, total weekly exercise volume and whether sessions were professionally supervised.

Exercise significantly improved aerobic capacity overall, with a standardised mean difference of 0.88 (95% CI 0.61-1.15, P < 0.00001) — a substantial effect by conventional interpretation. Among modalities, multicomponent training showed superior efficacy compared with the alternatives examined. The exploratory subgroup analyses pointed to better outcomes for programmes lasting at least 12 weeks, fewer than 3 sessions per week, sessions of 60 minutes or longer, total weekly exercise under 180 minutes, and sessions delivered under professional supervision. The abstract reports these as associations within subgroups rather than as tested head-to-head prescriptions.

That exercise raises aerobic capacity is well established in healthy adults, and this analysis extends the same conclusion specifically to people with elevated blood pressure, where fitness gains are often assumed but rarely quantified. The subgroup pattern is the awkward part: fewer sessions per week and less total weekly exercise appearing more favourable runs against a simple more-is-better dose-response, and could reflect differences between trials rather than the training itself. Open questions include whether these parameter combinations hold up when tested directly, and how fitness gains track alongside changes in blood pressure, which this analysis did not centre on.

If your blood pressure sits in the high or borderline range, this is reason to think structured training can meaningfully improve your aerobic fitness, not only your readings. Programmes that mix modalities — rather than a single type of exercise — carried the strongest signal here. The apparent advantage for longer, less frequent, supervised sessions is interesting but exploratory, so it is not a reason to cut your training frequency on the strength of this analysis alone. The broader takeaway is that fitness itself is a trackable outcome worth caring about in this group.