Lifting weights can soften stiff arteries in type 2 diabetes

Type 2 diabetes does much of its most serious damage through the blood vessels. Arteries tend to stiffen and the vessel lining loses its ability to relax and widen on demand, and both changes matter for long-term cardiovascular health. Exercise advice for people with type 2 diabetes has traditionally centred on aerobic work, while the effect of resistance training on the vessels themselves has been far less settled. This review set out to quantify whether programmes built around resistance training, either alone or combined with aerobic sessions, genuinely move these vascular measures.

The authors swept nine databases, including PubMed, Embase, Web of Science and the Cochrane Library, from their start dates up to August 2025. They included randomised controlled trials that tested resistance training alone, or resistance training combined with aerobic training, against non-exercise controls in adults with type 2 diabetes. Results were pooled using a random-effects approach, with effects expressed as standardised differences between groups. Prespecified subgroup analyses and meta-regression then explored whether intensity, duration or programme type changed the picture.

Compared with not exercising, resistance-based programmes reduced arterial stiffness by a small standardised amount (0.24) and improved flow-mediated dilation, a measure of how well the vessel lining works, by a moderate amount (0.61). Subgroup patterns suggested that combined resistance plus aerobic programmes gave more consistent benefits than resistance work alone, particularly at higher intensities and longer durations, although the formal moderator tests found no significant linear links. Wave reflection indices did not change significantly, and effects on peripheral haemodynamics remained inconclusive. The authors rated the stiffness and endothelial findings as moderate-certainty evidence.

This adds vessel-level evidence to a field where aerobic exercise has long been the default prescription for type 2 diabetes, and it suggests strength work belongs in the cardiovascular conversation. There is an important asterisk: most trials combined lifting with aerobic training, so the pooled numbers describe resistance-based programmes overall rather than lifting in isolation. Evidence for resistance training alone was more limited across several outcomes, and the review calls for well-designed, adequately powered trials with standardised vascular assessments. The null result for wave reflection is also a reminder that not every vascular measure responds.

If you have type 2 diabetes, or you are thinking about how to structure exercise for someone who does, this is a reason to view resistance training as more than a muscle and strength tool: in pooled trials it shifted measures of artery health too. The most consistent results came when weights were combined with aerobic work rather than done on their own. The stiffness effect was small, so this reads as one ingredient of vascular health rather than a fix. None of it replaces medical guidance for managing the condition itself.