Brain or Muscles, What Do We Lose First?
A “playground” for senior citizens
Credit: ClemMcGann / Wikimedia Commons
The literature in this area has been looking at the impact of physical activity on cognitive skills for a number of years. “Correlations have been established between these two factors, particularly in terms of memory, but also regarding the growth and survival of new neurons,” begins Boris Cheval, a researcher at UNIGE’s Swiss Centre for Affective Sciences (CISA). “But we have never yet formally tested which comes first: does physical activity prevent a decline in cognitive skills or vice versa? That’s what we wanted to verify.”
What came first: the chicken or the egg?
Earlier studies based on the correlation between physical activity and cognitive skills postulated that the former prevent the decline of the latter. “But what if this research only told half the story? That’s what recent studies suggest, since they demonstrate that our brain is involved when it comes to engaging in physical activity,” continues the Geneva-based researcher.
The UNIGE researchers tested the two possible options formally using data from the SHARE survey (Survey of Health, Aging and Retirement in Europe), a European-wide socio-economic database covering over 25 countries. “The cognitive abilities and level of physical activity of 105,206 adults aged 50 to 90 were tested every two years over a 12-year period,” explains Matthieu Boisgontier, a researcher at the Lives Swiss National Centre of Competence in Research (NCCR Lives). Cognitive abilities were measured using a verbal fluency test (naming as many animals as possible in 60 seconds) and a memory test (memorising 10 words and reciting them afterwards). Physical activity was measured on a scale of 1 (“Never”) to 4 (“More than once a week”).
The Geneva researchers employed this data in three separate statistical models. In the first, they looked at whether physical activity predicted the change in cognitive skills over time; in the second, whether cognitive skills predicted the change in physical activity; and in the third, they tested the two possibilities bidirectionally. “Thanks to a statistical index, we found that the second model adjusted the most precisely to the data of the participants,” says Cheval. The study demonstrates, therefore, that cognitive capacities mainly influence physical activity and not vice versa, as the literature to date had postulated. “Obviously, it’s a virtuous cycle, since physical activity also influences our cognitive capacities. But, in light of these new findings, it does so to a lesser extent,” points out Boisgontier.
Slowing down an inevitable decline
From the age of 50, the decline in physical and cognitive abilities is inevitable. However, these results indicate that, contrary to what was once thought, if we act first on our cognitive skills, we can slow the decline of this virtuous circle. “This study backs up our theory that the brain has to make a real effort to get out of a sedentary lifestyle and that by working on cognitive capacities, physical activity will follow”, says Cheval by way of conclusion.
Contacts and sources:
Boris Cheval
Université de Genève
Publication: . Relationship between decline in cognitive resources and physical activity.. Boris Cheval, Dan Orsholits, Stefan Sieber, Delphine Courvoisier, Stéphane Cullati, Matthieu P. Boisgontier Health Psychology, 2020; DOI: 10.1037/hea0000857
Source:
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