Older adults with faster gait speeds were about half as likely to develop cognitive impairment and maintained stronger mental function despite having similar levels of dementia-related brain pathology.
By yourNEWS Media Newsroom
Adults in their 80s who walked at a faster pace had an approximately 50% lower risk of developing cognitive impairment than slower walkers, according to a study published in the journal Neurology.
Researchers found that faster walkers also showed healthier brain structure on MRI scans and preserved stronger cognitive abilities even when they had levels of dementia-related brain pathology similar to those seen in people who walked more slowly.
The findings suggest that walking speed may provide a simple window into the health of the brain and several other body systems involved in movement, including the muscles, cardiovascular system and nervous system.
Dr. Joe Verghese, professor and chair of neurology at the Renaissance School of Medicine at Stony Brook University, said the results reinforce the close relationship between mobility and brain health.
The research drew on information from three large studies: the Health and Retirement Study International Network of Studies, the LonGenity Study and the RUSH Memory Aging Project.
Participants were adults in their 80s and were separated into two categories based on measured gait speed. Those with faster walking speeds were identified as “super movers,” while slower participants were classified as “non-super movers.”
Researchers assessed cognitive performance using standardized tests. They also evaluated brain health using MRI imaging and, for some participants, postmortem examinations measuring pathology associated with dementia.
The faster walkers were about half as likely to experience cognitive decline as those in the slower group.
They also displayed healthier brain structure on imaging, according to the study, and appeared better able to preserve memory and other mental abilities despite carrying comparable burdens of dementia-related pathology.
Verghese said this finding may indicate that faster walkers possess biological resilience mechanisms that help the brain continue functioning in the presence of age-related changes.
That resilience is sometimes described as cognitive reserve, or the brain’s ability to tolerate damage or degeneration without immediately showing symptoms such as memory loss, confusion or reduced processing ability.
Physical and mental activity may help strengthen cognitive reserve by keeping neural networks active and encouraging the brain to adapt to age-related changes.
Walking speed may reflect more than leg strength alone. Maintaining a brisk, steady gait requires the brain to coordinate balance, vision, spatial awareness, muscles, joints, circulation and signals traveling through the central and peripheral nervous systems.
A reduction in walking speed can therefore reflect problems occurring in one or several parts of the body.
Previous research has associated slower gait speed with elevated risks of dementia, stroke, frailty, falls, hospitalization and death, the study authors noted.
The new findings do not prove that deliberately walking faster will prevent cognitive decline.
Because the research was observational, it identified an association between gait speed and cognitive outcomes but could not establish a direct cause-and-effect relationship.
Slower walking may be an early sign of underlying neurological, cardiovascular or metabolic changes that also contribute to cognitive decline, rather than a cause of those changes.
Joint disease, chronic pain, heart problems, reduced lung capacity, balance difficulties and overall fitness can also affect how quickly an older adult walks.
Researchers cautioned that gait speed should therefore not be used by itself to diagnose dementia or predict an individual’s future cognitive health.
It may, however, serve as a practical and inexpensive screening measure during routine medical visits.
A clinician can assess walking speed without costly equipment, making it a useful indicator of overall health and possible changes that warrant further evaluation.
The findings add to broader evidence that regular movement can support both physical independence and brain function later in life.
Evolutionary biologists have described exercise as one of the brain’s most important tonics because the human body and nervous system developed around frequent movement.
Research published in Age and Ageing found that as little as five minutes of moderate-to-vigorous activity, including brisk walking, was associated with improvements in memory, attention and processing speed among older adults.
A separate 12-week intervention study published in PLOS ONE found that frail or prefrail older adults improved their physical function after increasing their walking pace by as little as 14 steps per minute.
Other research reported a 65% improvement in mobility among seniors who walked briskly, suggesting that even modest increases in pace may help older adults preserve physical independence.
Walking more quickly can challenge the heart, lungs, muscles and nervous system more than moving at a leisurely pace. Over time, that increased demand may support endurance, strength, coordination and blood flow.
Regular aerobic activity can also help manage vascular risk factors that affect both mobility and cognition, including high blood pressure, diabetes and poor circulation.
Exercise is considered one of the strongest modifiable behaviors associated with maintaining brain health, sharpening memory and reducing dementia risk.
Aerobic exercise supports circulation and cardiovascular function, while strength training can help preserve muscle mass, balance and stability. Together, those forms of activity may reduce frailty and make it easier for older adults to remain physically active.
The study’s findings do not mean that people with slower walking speeds should simply force themselves to move faster without considering their safety or health conditions.
Older adults with balance problems, joint pain, heart disease or a history of falls may need medical guidance or supervised exercise before increasing their pace.
Future research will need to determine whether interventions that improve gait speed can also lower the risk of cognitive impairment.
Randomized studies could help distinguish whether faster walking directly protects the brain or whether it primarily serves as a marker of healthier underlying biology.
Researchers may also examine whether specific walking programs, strength exercises or balance training can improve both mobility and cognitive performance.
Verghese said other elements of healthy aging remain important, including regular social engagement, adequate sleep and a nutritious diet.
Managing blood pressure, blood sugar and other cardiovascular risks can support the blood vessels that supply both the brain and the muscles used for movement.
Mental stimulation may also contribute to cognitive reserve by encouraging the brain to maintain and develop neural connections.
The study indicates that walking speed can provide valuable information about how well an older adult’s body and brain are functioning together.
For health professionals, measuring gait speed may offer a quick way to identify patients who could benefit from further cognitive, neurological or physical assessment.
For older adults, the findings add to the evidence that maintaining mobility through safe aerobic exercise, strength training and regular daily movement may support independence and healthy brain aging.
Although a brisk pace cannot be considered a guaranteed defense against dementia, the ability to walk faster appears to be associated with stronger physical resilience, healthier brain structure and a substantially lower likelihood of cognitive decline in advanced age.
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