American scientists have made a surprising discovery about the connection between a person's physical strength and the activity of their brain. In the process of researching healthy aging, they found an unusual structure deep within the brain that helps maintain physical strength as one ages. These results suggest that age-related weakness can be recognized and prevented before it manifests. The researchers analyzed blood flow in the brains of elderly participants while they performed a simple task—maximal compression of a special device designed to measure strength.
This test, known in medicine, is used to assess physical endurance and the vulnerability of the body. One of the authors of the study, Xiaoping Hu, noted: “Grip strength is more than just muscle strength. It is an indicator of how well your body and brain function during the aging process.” After analyzing the data, as reported by SciTechDaily, the scientists identified an interesting pattern: the caudate nucleus, responsible for movement and decision-making, emerged as the main predictor of muscle strength. Its influence on physical fitness had not been studied before.
Sixty elderly men and women participated in the study, for whom three magnetic resonance imaging scans were conducted during physical exercises. To exclude the influence of body size, the researchers took into account the gender and muscle mass of the volunteers. Researcher Amin Ghaffari described the process: “It’s like creating a map of all the neural connections in your brain to understand which of them affect grip strength. One of the clearest signals came from the network that includes the caudate nucleus.” An increased blood flow and strong connections in this area of the brain directly indicated a stronger grip.
In addition to the caudate nucleus, connections with centers of memory, emotions, and attention were also noted, but their influence was less pronounced. For the first time, scientists recorded these processes during physical exertion, whereas previously they had only studied tissue structure or their functioning at rest. “This could help doctors identify age-related frailty more promptly by determining patterns in brain activity even before strength loss begins to manifest,” the authors of the study suggest. Age-related weakness complicates recovery from injuries and illnesses, affecting both physical condition and mental abilities.
By identifying the connection between physical strength and certain brain networks, researchers hope to develop new diagnostic tools and training programs aimed at slowing down the aging process. “Just as you can strengthen muscles through exercise, we could find ways to strengthen neural connections through targeted methods,” the scientists emphasize. They hope that their discoveries will help make more accurate predictions in the future and reduce the negative effects of aging. “We study aging not as a one-time event, but as a continuous process,” the specialists concluded.
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