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Nature Human Behaviour | Volume 8 | August 2024 | 1460–1463 1460
nature human behaviour
Matters arising
https://doi.org/10.1038/s41562-024-01949-x
Do not underestimate the cognitive benefits
of exercise
Olivier Dupuy1,2,33, Sebastian Ludyga  3,33 , Francisco B. Ortega  4,5,6,
Charles H. Hillman  7,8, Kirk I. Erickson9,10, Fabian Herold  11, Keita Kamijo12,
Chun-Hao Wang  13,14 , Timothy P. Morris8, Belinda Brown15,16,
Irene Esteban-Cornejo4,5,17, Patricio Solis-Urra  4,18, Laurent Bosquet1,
Markus Gerber3, Said Mekari19,20, Nicolas Berryman  21,22,23, Louis Bherer  24,
Ben Rattray  25, Teresa Liu-Ambrose26,27,28, Claudia Voelcker-Rehage  29 &
Boris Cheval  30,31,32
arising from
L. F. Ciria et al. Nature Human Behaviour https://doi.org/10.1038/
s41562-023-01554-4 (2023).
Evidence suggests that physical exercise benefits cognition across the
lifespan
1,2
. Nevertheless, in an umbrella review of 24 meta-analyses
of randomized controlled trials, Ciria et al.
3
concluded that there is
no support for a causal effect of physical exercise on cognitive per-
formance in healthy populations. As a group of international experts
in the exercise–cognition field, we disagree with this conclusion due
to methodological and theoretical limitations that have received
little consideration. We believe the authors’ warning of caution for
the World Health Organization’s recommendations
2
regarding the
cognitive benefits of exercise is unwarranted.
Ciria et al.3 criticized previous meta-analyses for not including all
available primary studies. However, each meta-analysis had specific
research aims that informed their selection of studies. The lack of broad
eligibility criteria is not necessarily a limitation of previous works but
may serve to improve comparability between studies. Ciria et al.3 can
similarly be criticized for selection bias, because they included only 109
of the 257 available studies in their meta-analysis after applying eligi-
bility criteria that differed from those used in previous meta-analyses.
Specifically, they excluded several types of physical exercise interven-
tions, such as forms of coordination training, as they contend that
Received: 4 September 2023
Accepted: 15 May 2024
Published online: 20 August 2024
Check for updates
1Laboratory MOVE, Faculty of Sport Sciences, University of Poitiers, Poitiers, France. 2School of Kinesiology and Physical Activity Sciences, Faculty
of Medicine, University of Montreal, Montreal, Quebec, Canada. 3Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland.
4Department of Physical Education and Sports, Faculty of Sport Sciences, Sport and Health University Research Institute (iMUDS), University of Granada,
Granada, Spain. 5Centro de Investigación Biomédica en Red Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.
6Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland. 7Department of Psychology, Northeastern University, Boston, MA, USA.
8Department of Physical Therapy, Movement, and Rehabilitation Sciences, Northeastern University, Boston, MA, USA. 9AdventHealth Research Institute,
Neuroscience, Orlando, FL, USA. 10Department of Psychology, University of Pittsburgh, Pittsburgh, PA, USA. 11Faculty of Health Sciences Brandenburg,
University of Potsdam, Potsdam, Germany. 12Faculty of Liberal Arts and Sciences, Chukyo University, Nagoya, Japan. 13Institute of Physical Education,
Health and Leisure Studies, National Cheng Kung University, Tainan City, Taiwan (R.O.C.). 14Department of Psychology, National Cheng Kung University,
Tainan City, Taiwan (R.O.C.). 15Centre for Healthy Ageing, Murdoch University, Murdoch, Western Australia, Australia. 16Centre for Precision Health,
Edith Cowan University, Joondalup, Western Australia, Australia. 17Instituto de Investigación Biosanitaria ibs.GRANADA, Granada, Spain. 18Faculty of
Education and Social Sciences, Universidad Andres Bello, Viña del Mar, Chile. 19Department of Family Medicine, Université de Sherbrooke, Sherbrooke,
Quebec, Canada. 20Centre de Formation Médicale du Nouveau-Brunswick, Université de Sherbrooke, Moncton, New Brunswick, Canada. 21Département
des Sciences de l’Activité Physique, Faculté des Sciences, Université du Québec à Montréal, Montreal, Quebec, Canada. 22Centre de recherche de
l’institut universitaire de gériatrie de Montréal, Montreal, Canada. 23Institut National du Sport du Québec, Quebec, Canada. 24Department of Medicine,
Université de Montréal, Institut Universitaire de Gériatrie de Montréal and Montreal Heart Institute, Montreal, Quebec, Canada. 25Research Institute for
Sport and Exercise, Faculty of Health, University of Canberra, Canberra, Australian Capital Territory, Australia. 26Djavad Mowafaghian Centre for Brain
Health, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada. 27Centre for Aging SMART,
Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada. 28Department of Physical Therapy,
Vancouver Coastal Health Research Institute, Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada. 29Department of
Neuromotor Behavior and Exercise, Institute of Sport and Exercise Sciences, University of Münster, Münster, Germany. 30Department of Sport Sciences
and Physical Education, Ecole Normale Supérieure de Rennes, Bruz, France. 31University of Rennes, Rennes, France. 32Laboratory VIPS2, University of
Rennes, Rennes, France. 33These authors contributed equally: Olivier Dupuy, Sebastian Ludyga.  e-mail: Sebastian.ludyga@unibas.ch
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... Given the accessibility of regular physical activity, our results highlight the importance of promoting an active lifestyle as a potential strategy for preserving cognitive function in aging populations. It should be noted, however, that, despite the abundance of observational evidence, the efficacy of exercise training to significantly improve cognitive function is less clear.49,50 This may be in-part due to the relatively short duration of exercise trials (e.g., 6-12 months) in relation to the slow progressive nature of AD. 2,3 Perhaps a sustained physically active lifestyle throughout the long asymptomatic stage is necessary to substantially reduce AD-related cognitive decline. ...
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... Given the converging evidence from children , patients with brain lesions , and neuroimaging research (Vallesi et al. 2009), which have shown that temporal preparation primarily relies on the integrity of the prefrontal cortex-a region known to be vulnerable to cognitive aging (West 1996), examining the ability of elderly adults to prepare a response during variable FP tasks may provide valuable insights into the mechanisms of agerelated cognitive processing speed. Regular physical activity and increased physical fitness have been associated with improved neurocognitive function in elderly adults (Dupuy et al. 2024;Erickson et al. 2022;Kramer et al. 1999;Wang 2020;. A few studies have also observed a positive effect of higher aerobic fitness on temporal preparation in elderly adults. ...
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... Given the complexity and difficulty of designing and conducting clinical trials in children, it is appealing to go down the path of conducting systematic reviews on this topic. However, with the size of the field and significant variation in participant characteristics, exercise dosage, and outcome measures among others, meta-analyses that take a "broad strokes" approach to their research questions and inclusion criteria are more likely to produce conflicting results and interpretations that do not reflect the specific context of the original studysee, for example, Ciria et al. 67 and the subsequent rebuttal by Dupuy et al. 68 In the context of the current topic, if sensitive periods are to be investigated through systematic reviews and meta-analyses, it is likely that the effects of exercise on brain and cognition will be dependent upon the outcome of interest and period of underlying development. While age is a likely proxy for underlying development, it must be remembered that this process is non-linear, and this will impact the inclusion criteria of reviews and the way in which age is treated as a nonlinear variable in meta-regression. ...
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Background Physical exercise is seen as a promising intervention to prevent or delay cognitive decline in individuals aged 50 years and older, yet the evidence from reviews is not conclusive. Objectives To determine if physical exercise is effective in improving cognitive function in this population. Design Systematic review with multilevel meta-analysis. Data sources Electronic databases Medline (PubMed), EMBASE (Scopus), PsychINFO and CENTRAL (Cochrane) from inception to November 2016. Eligibility criteria Randomised controlled trials of physical exercise interventions in community-dwelling adults older than 50 years, with an outcome measure of cognitive function. Results The search returned 12 820 records, of which 39 studies were included in the systematic review. Analysis of 333 dependent effect sizes from 36 studies showed that physical exercise improved cognitive function (0.29; 95% CI 0.17 to 0.41; p<0.01). Interventions of aerobic exercise, resistance training, multicomponent training and tai chi, all had significant point estimates. When exercise prescription was examined, a duration of 45–60 min per session and at least moderate intensity, were associated with benefits to cognition. The results of the meta-analysis were consistent and independent of the cognitive domain tested or the cognitive status of the participants. Conclusions Physical exercise improved cognitive function in the over 50s, regardless of the cognitive status of participants. To improve cognitive function, this meta-analysis provides clinicians with evidence to recommend that patients obtain both aerobic and resistance exercise of at least moderate intensity on as many days of the week as feasible, in line with current exercise guidelines.
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Exercise is a non-pharmacological strategy to mitigate the deleterious effects of aging on brain health. However, a large amount of variation exists in its efficacy. Sex of participants and exercise type are two possible factors contributing to this variation. To better understand this, we conducted a concurrent systematic review and meta-analysis of cognitively healthy older adults. Executive functions, episodic memory, visuospatial function, word fluency, processing speed and global cognitive function were examined for exercise- and sex-dependent effects. For executive functions, three types of exercise interventions – aerobic training, resistance training, and multimodal training (i.e., both aerobic and resistance training) – were associated with larger effect sizes in studies comprised of a higher percentage of women compared to studies with a lower percentage of women. This suggests that women’s executive processes may benefit more from exercise than men. Regardless of sex, compared to control, all three exercise training approaches enhanced visuospatial function, but only multimodal training enhanced episodic memory. Overall, aerobic training led to greater benefits than resistance training in global cognitive function and executive functions, while multimodal combined training led to greater benefits than aerobic training for global cognitive function, episodic memory, and word fluency. Possible underlying mechanisms, including brain-derived neurotrophic factor and sex steroid hormones, are discussed.