Lifting supports cognition in older adults — 60–79% of 1RM was the most consistent

Population ageing brings rising risk of cognitive decline, and with it the need for accessible, effective interventions. Resistance training has emerged as a promising non-pharmacological strategy, but which intensity best supports cognitive outcomes has remained unclear. This review tackled that question directly.

It synthesised 28 peer-reviewed publications representing 24 independent study samples, published between 2014 and 2024, all examining how resistance training intensity affects cognitive function and related physiological markers in older adults.

What improved?

Low-, moderate- and high-intensity resistance training all improved cognitive performance and markers of overall brain and physiological health. Those markers included neurotrophic factors, inflammation and cerebral blood flow.

The cognitive domains where benefits were reported:

• Executive function — the higher-order control functions like planning, switching and inhibition
• Memory
• Processing speed
• Spatial abilities

Which intensity worked best?

Moderate-intensity resistance training showed the most consistent benefits, and the review puts a number on it: approximately 60–79% of one-rep maximum.

To translate that, 60–79% of 1RM is roughly the load you can move for eight to fifteen repetitions. Not a maximal attempt, not a warm-up weight — precisely the range most people mean when they say they are training properly.

What does it mean in practice?

The most practical detail is that benefits were reported at all three intensities. Anyone whose joints or pain rule out heavy loading is not excluded from the cognitive side of this.

The finding also points the same way as the sarcopenia literature. In the sarcopenia network meta-analysis, the clearest improvement in grip strength came from moderate rather than high intensity too. The reason moderate keeps ranking well in older populations is probably sustainability — an intensity you can repeat every week is the one that accumulates.

How this relates to your strength score

Raising a strength score requires loading close to a one-rep max, while the range this review credits for cognition sits lower, at 60–79%. Two goals asking for different intensities — but in a real programme they do not conflict. Most strength programmes already contain both: heavy main sets, and accessory volume beneath them.

So a training log past 60 reads on two levels. The Big 3 numbers record strength, while the moderate-intensity volume repeated every week to produce those numbers is what this review values on the cognitive side. Even in a period when the score looks flat, that volume is still working.