Walking May Slow Alzheimer’s Disease Progression

Recent research suggests that even modest amounts of walking can help delay brain changes linked to Alzheimer’s disease. Intriguingly, the study identifies a specific range of steps that seems to optimize these benefits.

Conducted by researchers at Brigham General in Massachusetts, the study involved about 300 older adults, aged between 50 and 90, who began the study without any signs of dementia.

Over a period of nine years, the research team monitored the daily steps of participants and performed brain scans to assess levels of amyloid beta and tau proteins, both crucial markers of Alzheimer’s disease. Elevated levels of these proteins can indicate the onset of the disease well before any memory issues become apparent.

The researchers also administered annual cognitive tests to track participants’ memory and thinking abilities.

Particularly, they concentrated on individuals who already demonstrated elevated amyloid levels, as these individuals are at a greater risk of developing Alzheimer’s.

According to findings, participants who walked between 3,000 and 5,000 steps daily—roughly 1.5 to 2 miles—enjoyed a delay in cognitive decline of about three years compared to those who were less active. Those who walked an average of 5,000 to 7,500 steps witnessed an even more significant impact, slowing cognitive decline by approximately seven years.

The study received partial funding from the National Institutes of Health and was published in the journal Nature Medicine.

Interestingly, additional findings indicated that walking more was linked to a reduced buildup of tau proteins in the brain, hinting that physical activity might directly affect one of the more harmful processes associated with the disease.

However, individuals with naturally low amyloid levels did not show significant differences in cognitive outcomes based on their step count, showcasing that the most notable effects were among those already exhibiting early signs related to Alzheimer’s.

In contrast to the established goal of 10,000 steps daily, this study suggests that benefits plateau around 7,500 steps. For older adults, increasing activity from very low levels to just a few thousand steps can make a considerable difference over time.

“Lifestyle factors appear to influence the early stages of Alzheimer’s disease, suggesting that if acted upon early, lifestyle changes may slow the onset of cognitive symptoms,” remarked Jasmeer Chatwal, M.D., of the Massachusetts General Brigham Department of Neurology.

While the study establishes a strong correlation between walking and slower cognitive decline, researchers caution that they cannot definitively prove causation due to the observational nature of their work. People who walk more might engage in other healthy practices, such as improved diet and increased social interaction.

It’s also worth noting that the study’s participants primarily consisted of healthy, educated volunteers who were willing to undergo brain scans, which might limit the generalizability of the findings.

Dr. Courtney Kloske, a director at the Alzheimer’s Association of Chicago, expressed that this was “a very well-done study with some interesting results.” She emphasized that while moderate exercise is beneficial, it is just one part of a broader lifestyle approach that seems to support cognitive health.

Dr. Kloske noted, “We don’t yet know how much of each ingredient is present, such as nutrition and social engagement” that could contribute significantly to cognitive health.

“Even small increases in daily activity can add up over time and lead to lasting changes in your habits and health.”

The National Institute on Aging offers several walking safety tips for older adults:

• Plan ahead and ensure someone knows your whereabouts.
• Keep identification, emergency contacts, and a charged phone handy.
• Wear sturdy shoes with good grip, and dress in layers.
• Opt for a well-lit area, keep music volume low, and wear bright or reflective clothing.
• Walk on sidewalks or paths facing oncoming traffic.

Lead author Wai-Ying Wendy Yau, MD, emphasized the importance of physical activity for brain health, stating, “Every step is important, and even small increases in daily activity can create lasting changes in your habits and health over time.”