Abstract
Extensive research links regular physical exercise to an overall enhancement of cognitive function across the lifespan. Here we assess the causal evidence supporting this relationship in the healthy population, using an umbrella review of meta-analyses limited to randomized controlled trials (RCTs). Despite most of the 24 reviewed meta-analyses reporting a positive overall effect, our assessment reveals evidence of low statistical power in the primary RCTs, selective inclusion of studies, publication bias and large variation in combinations of pre-processing and analytic decisions. In addition, our meta-analysis of all the primary RCTs included in the revised meta-analyses shows small exercise-related benefits (d = 0.22, 95% confidence interval 0.16 to 0.28) that became substantially smaller after accounting for key moderators (that is, active control and baseline differences; d = 0.13, 95% confidence interval 0.07 to 0.20), and negligible after correcting for publication bias (d = 0.05, 95% confidence interval −0.09 to 0.14). These findings suggest caution in claims and recommendations linking regular physical exercise to cognitive benefits in the healthy human population until more reliable causal evidence accumulates.
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Data availability
Data used to support the conclusions of this study are available at the OSF repository: https://osf.io/e9zqf/.
Code availability
Codes used for the analyses presented here are available at the OSF repository: https://osf.io/e9zqf/.
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Acknowledgements
This research was supported by a postdoctoral fellowship from the Junta de Andalucía to L.F.C. (DOC00225), a predoctoral fellowship from the Spanish Ministry of Education, Culture and Sport (FPU17/02864), and a research grant from the Junta de Andalucía (PY20_00693) to R.R.-C., a research grant from the Community of Madrid and the Rey Juan Carlos University (V-1159) to A.L.-C., and two research grants from the Spanish Ministry of Economy and Competitiveness awarded to M.A.V. (PID2020-118583GB-I00) and to D.S. (PID2019-105635GB-I00). The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.
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L.F.C., M.A.V., D.H., A.L.-C., P.P. and D.S. were involved in the original conceptualization. L.F.C., R.R.-C., M.A.V., D.H., A.L.-C., P.P. and D.S. were responsible for developing the study methodology. L.F.C., D.H. and D.S. did the literature search. L.F.C., R.R.-C., M.A.V., D.H., A.L.-C., P.P. and D.S. were responsible for data curation. R.R.-C. and M.A.V. did the formal statistical analysis. L.F.C., R.R.-C., D.H. and D.S. wrote the original draft. M.A.V., D.H., A.L.-C. and P.P. edited and reviewed the manuscript.
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Ciria, L.F., Román-Caballero, R., Vadillo, M.A. et al. An umbrella review of randomized control trials on the effects of physical exercise on cognition. Nat Hum Behav 7, 928–941 (2023). https://doi.org/10.1038/s41562-023-01554-4
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DOI: https://doi.org/10.1038/s41562-023-01554-4