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As more and more research keeps pointing out, exercise does wonders for our brain.

For instance, a recent study that Medical News Today reported on shows that running protects our memory from the harmful effects of stress.

Additionally, research has shown that exercise helps to prevent the aging of the brain and to keep mild cognitive impairment (MCI) — a precursor of dementia in seniors — at bay.

But exactly how much exercise do seniors need in order to fully reap these cognitive benefits? And for how long do they have to do it?

To find out, researchers led by Joyce Gomes-Osman, Ph.D. — from the University of Miami Miller School of Medicine in Florida — set out to conduct a meta-analysis of existing studies.

More specifically, they examined all of the randomized controlled trials in which a group of seniors exercised for a minimum of 4 weeks and had their memory and reasoning skills compared with those of a control group at the end of the intervention.

The findings were published in the journal Neurology: Clinical Practice.