A new study led by the University of Central Florida (UCF) suggests Alzheimer's disease may produce early warning signs outside the brain, with movement difficulties potentially appearing years before memory problems. The research, published on November 9, 2026, indicates that gene mutations linked to Alzheimer's may disrupt the peripheral nerves that control muscle movement, even without direct involvement of the brain or spinal cord.
Motor Deficits Could Precede Memory Loss
The study, led by James Hickman and Xiufang “Nadine” Guo at UCF, with researchers from healthcare technology company Hesperos, focused on familial Alzheimer's, a rare inherited form of the disease that typically develops earlier in life (from 40 to 65 years of age) than the more common form. The team's experiments revealed that motor neurons carrying mutations linked to familial Alzheimer's could disrupt the connections responsible for controlling muscles, even when the brain and spinal cord were completely absent from the experimental system.
Motor neurons are specialized nerve cells that transmit signals to muscles, telling them when to contract and produce movement. The new findings suggest that Alzheimer's mutations can interfere with this process directly, rather than affecting movement only through damage to the brain.
What the Findings Mean for Diagnosis
Guo said: "Motor deficits may be an earlier indication [of Alzheimer's]. If we can detect those changes and intervene earlier, that could help delay the onset of central nervous system symptoms." Hickman added: "This is the first time it's been demonstrated that deficits in the peripheral nervous system can arise directly from these mutations. It means drugs that target the brain may not fix problems in the rest of the body."
The discovery "raises the possibility that movement difficulties could provide earlier warning signs of the disease and that treatments focused exclusively on the brain may overlook important problems elsewhere in the body," according to the study. This could help explain why some people with Alzheimer's develop walking, balance or coordination problems "long before noticeable memory problems emerge."
Looking Beyond Cognitive Symptoms
The experts note that the findings suggest a potentially important new direction for Alzheimer's research, involving looking beyond memory and other cognitive symptoms when investigating the disease. If future studies confirm that changes in motor function are detectable early in certain patients, tests of walking, coordination, or nerve-to-muscle activity might eventually help identify disease-related changes before more obvious neurological symptoms develop.
More research is needed to be sure what this means, they say. If early movement changes can be reliably picked up in some people, simple checks of walking, coordination, or nerve-to-muscle signals could one day help spot Alzheimer's earlier, before clear brain symptoms show.
Experts at Alzheimer's Research UK explain that because dementia can stem from several different brain diseases, getting a clear, specific diagnosis can make a real difference to how the condition is managed. Before a dementia-causing disease is identified, a person may first be diagnosed with mild cognitive impairment, at which stage they can usually continue making their own decisions with support from family and friends.
