- Design
- Systematic review and meta-analysis of randomised trials
- Population
- 17 trials, 1,251 older adults with mild cognitive impairment
- Primary outcome
- Cognitive function domains and blood BDNF
- Effect
- Global cognition SMD 0.82 (95% CI 0.55 to 1.09)
A meta-analysis pooled 17 randomised trials of 1,251 older adults with mild cognitive impairment, testing mind-body exercise such as tai chi, Baduanjin, yoga and mindfulness meditation against control conditions.
Mind-body exercise improved global cognition (standardised mean difference 0.82, 95% CI 0.55 to 1.09), verbal fluency (0.58), executive function (0.39), episodic memory (0.59) and short-term memory (0.54). Working memory showed a possible improvement that was not robust, and processing speed and blood BDNF levels did not change significantly. Tai chi-based programmes and those lasting more than 12 weeks appeared to help most.
For people with mild cognitive impairment, there is no drug that clearly slows progression for most, so a safe, cheap, group-based activity with consistent cognitive benefit is worth prescribing. Yoga and similar practices are widely available in India and culturally familiar to many older adults.
The outcomes are cognitive test scores over the trial period, not progression to dementia, and the trials were mostly small. The abstract does not report heterogeneity for the main outcome.
- Recommend regular mind-body exercise, such as tai chi or yoga, for people with mild cognitive impairment.
- Aim for programmes of more than 12 weeks; longer courses looked more effective.
- Group classes add social contact, which is valuable in its own right.
- Adapt for balance and mobility limits to keep sessions safe.
- Explain that benefits were on test scores; effects on dementia progression are not established.
Why it matters
It gives clinicians something safe and evidence-based to offer at a diagnosis that usually comes with little to do.
Don't overread it
The trials measured cognitive test scores, not dementia onset; prevention of dementia is not shown.
The statistics, in plain English
A standardised mean difference of 0.82 is a large effect on global cognition scores. Smaller trials often report larger effects, so the true benefit may be more modest.
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