HIIT topped the blood-pressure rankings, but no mode clearly won

Exercise is one of the few genuinely effective non-drug ways to lower blood pressure, and guidelines say so. But most of those recommendations rest on clinic readings taken at rest, which capture a single moment in a doctor's room. Ambulatory blood pressure, measured repeatedly over 24 hours as people go about their day, predicts outcomes better and is harder to fool. Very few studies have compared exercise modes head to head using that better measure, leaving open the practical question of whether it matters which type of training you choose.

The reviewers searched PubMed and the Cochrane Library for randomised controlled trials published before January 2025 that reported changes in 24-hour systolic ambulatory blood pressure after an exercise intervention lasting at least two weeks. Eligible trials in adults compared aerobic training, resistance training, high-intensity interval training, combined training or isometric training against a non-exercising control or against another mode. Twenty-five studies with 1,096 participants met the inclusion criteria, and 16 of them could be linked into the comparison network. A Bayesian network meta-analysis was used, with modes ranked by surface under the cumulative ranking curve values.

Aerobic training reduced 24-hour systolic ambulatory pressure by 4.77 mmHg and high-intensity interval training by 6.86 mmHg, while resistance training produced a smaller 2.25 mmHg reduction. The ranking placed HIIT top at 91.4%, aerobic training next at 68.2% and resistance training last at 35.4%. Despite that ordering, no statistically significant comparative differences emerged between any of the modes, meaning the network could not separate them. Data were too sparse to analyse combined training or isometric training at all, so those modes are simply absent from the comparison rather than shown to be ineffective.

This extends the existing case for exercise in blood pressure management onto the measure that carries more prognostic weight, and it broadly agrees with clinic-based evidence that aerobic work helps. Where it complicates the picture is the ranking: interval training looks best on the league table yet cannot be shown to beat steady aerobic work, so anyone quoting the order as a recommendation is overreading it. The gaps are substantial, with isometric training in particular a popular candidate that this network could not evaluate. The authors call for larger head-to-head trials that measure ambulatory pressure directly.

The useful message is that regular aerobic training and interval training both appear to shift 24-hour blood pressure by a meaningful amount, and resistance training by less. Because nothing separated the modes statistically, there is no evidence here that abandoning the training you actually enjoy in favour of a supposedly superior format will buy you lower readings. Combined and isometric approaches are not ruled out; they were simply not testable in this analysis. Blood pressure management is a medical matter, and this is context for that conversation rather than a substitute for it.