Alzheimer’s disease does not begin on the day a person starts forgetting names, appointments, or familiar places.
Changes inside the brain may slowly build for many years before memory problems become clear enough for a diagnosis.
This long silent period creates a major challenge for doctors. By the time symptoms are obvious, damage may already be widespread, making it much harder to slow the disease or protect brain function.
Researchers at Texas A&M University are now studying a surprisingly simple possible warning sign: the way a person walks. They want to know whether small changes in walking could reveal early biological signs of Alzheimer’s disease before a person notices problems with thinking or memory.
The research is led by Dr. Jenna Yentes, an associate professor in Texas A&M’s Department of Kinesiology and Sport Management. The university has reported the ongoing research as part of its work on earlier detection of Alzheimer’s disease and related dementias.
Walking may seem like a simple physical activity, but it actually requires close cooperation between the brain, nerves, muscles, balance systems, and senses. The brain must constantly decide where to place the feet, how fast to move, and how to respond to changes in the surroundings.
Because walking depends so heavily on the brain, researchers have long suspected that changes in gait could provide information about brain health. Earlier studies have found walking differences in people who already have dementia or mild problems with thinking.
Yentes and her colleagues want to look even earlier. Their goal is to study adults who appear cognitively healthy and find out whether their walking patterns match biological changes associated with Alzheimer’s disease.
The project plans to recruit 50 adults between ages 45 and 85 who do not have dementia. Participants will complete memory and thinking tests, answer questions about their health, provide blood samples, receive brain MRI scans, and undergo detailed walking tests.
During the walking tests, researchers will use motion-capture technology to measure how participants move. They will record both the speed people naturally choose and the fastest speed they can comfortably maintain.
One measurement of particular interest is called gait reserve. In simple terms, this is the difference between a person’s usual walking speed and the fastest speed that person can safely reach.
A larger reserve may show that the body and brain have extra ability to respond when greater effort is needed. A shrinking reserve could potentially signal that this ability is changing, although the study must determine whether it is actually connected with early Alzheimer’s biology.
The researchers will also examine differences from one step to the next. Healthy walking is not perfectly identical with every step because the body constantly makes small adjustments to changes in the ground, balance, speed, and surroundings.
Too much irregularity could suggest that the system controlling movement is becoming less stable. On the other hand, too little natural variation might suggest that the body has become less flexible in responding to changing demands.
The team will compare these walking measurements with brain scans, blood markers, and cognitive test results. If certain walking patterns repeatedly appear alongside early biological signs of Alzheimer’s, gait could eventually become a useful signal that further testing is needed.
Studying people beginning at age 45 is important because Alzheimer’s-related brain changes may start one or two decades before noticeable memory loss. Detecting those changes during middle age could create a much larger window for monitoring health and, eventually, using preventive treatments.
Yentes imagines a future in which walking measurements become as routine as checking blood pressure. A person might walk across a special mat during an annual medical visit, allowing doctors to compare walking speed and other features from year to year.
A sudden or steady change would not diagnose Alzheimer’s by itself. Instead, it could give doctors a reason to look more closely with cognitive testing, blood tests, brain imaging, or other medical assessments.
The idea is attractive because walking tests could eventually be inexpensive, quick, and non-invasive. They may also be easier to repeat regularly than brain scans, which are costly and are not practical as routine screening tests for everyone.
Still, this research is at an early stage and should be interpreted carefully. The planned study includes only 50 participants, so even promising results would need to be confirmed in much larger and more diverse groups before gait could be used as a reliable screening tool.
Walking also changes for many reasons unrelated to dementia, including arthritis, injuries, muscle weakness, medications, vision problems, heart disease, and normal aging. Researchers will therefore need to show that any gait pattern linked with Alzheimer’s provides useful information beyond these other influences.
The strength of the project is that it compares walking with several different measures of brain and cognitive health rather than relying on gait alone. If the same pattern appears across movement tests, blood markers, brain scans, and later follow-up studies, the evidence would become much stronger.
For now, the study does not show that a slower walk means someone is developing Alzheimer’s disease. Instead, it tests an important possibility: ordinary movement may contain early clues about changes in the brain long before memory loss becomes obvious.
Source: Texas A&M University.
