New research has highlighted a little-known structure deep within the brain that may be essential for maintaining physical strength as people grow older. Scientists suggest this region could play a key role in identifying early signs of frailty, potentially allowing interventions before noticeable physical decline begins. Rather than focusing solely on muscles, the study points to the brain as a central driver of how well the body preserves strength with age, offering a more complete picture of the ageing process.
The research team used functional MRI scans to observe brain activity in older adults while they completed a revealing yet straightforward task: squeezing a handheld device with maximum effort. This measurement, commonly referred to as a grip strength test, is increasingly recognised as a reliable indicator of overall health and resilience. Although it seems basic, grip strength is closely linked to mobility, recovery from illness, and independence later in life.
One finding stood out clearly among the many brain regions analysed. The strongest predictor of grip strength was the caudate nucleus, a deep brain structure traditionally associated with movement control and decision-making. Until now, its involvement in physical strength and vulnerability in ageing has received little attention. The discovery suggests that this region may act as a central hub connecting neural function with muscular performance.
To reach this conclusion, researchers mapped each participant’s brain communication networks and compared them with recorded grip strength levels. This approach allowed them to see which neural pathways aligned most closely with physical output. The clearest patterns consistently involved the caudate nucleus, showing that stronger connectivity and blood flow in this area were linked to better grip strength, regardless of sex or body composition.
The study involved 60 older adults who each completed multiple brain scans alongside strength testing sessions. The researchers carefully adjusted their data to remove the influence of differences in muscle mass and physical size, ensuring the results reflected brain activity rather than simple physical variation. While a few other brain regions showed weaker connections to grip performance, none matched the influence of the caudate nucleus.
These findings could have significant implications for how frailty is detected and managed. Since grip strength is already a simple clinical tool, linking it to specific brain networks may lead to earlier and more precise assessments of physical decline. In the long term, scientists hope this knowledge could support targeted therapies aimed at strengthening neural connections, much like physical exercise strengthens muscles. Although further research is needed, the study provides a promising step towards understanding ageing as an interconnected brain–body process rather than a purely physical one.
More information: Amin Ghaffari et al, Connectome-based predictive modeling of grip strength: a marker of physical frailty, Frontiers in Neuroscience. DOI: 10.3389/fnins.2025.1697908
Journal information: Frontiers in Neuroscience Provided by University of California – Riverside
