Walking 8.9k steps a day could protect against Alzheimer's - study

The study also suggests that lowering risk factors such as smoking, high cholesterol and obesity may offer additional protection.

According to researchers, walking 8,900 steps a day can help protect against cognitive decline and brain tissue loss from Alzheimer's disease.

The study also indicates that lowering vascular risk factors, such as smoking, high cholesterol and obesity, may offer additional protection against Alzheimer's and delay the progression of the devastating disease.

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Published in JAMA Neurology, the research sets out interventional approaches that target both physical activity and vascular risk factors may delay the progression of Alzheimer's disease.

Co-author Reisa Sperling, director of the Centre for Alzheimer's Research and Treatment, said: "Beneficial effects were seen at even modest levels of physical activity, but were most prominent at around 8,900 steps, which is only slightly less than the 10,000 many of us strive to achieve daily."

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"One of the most striking findings from our study was that greater physical activity not only appeared to have positive effects on slowing cognitive decline but also on slowing the rate of brain tissue loss" - Jasmeer Chhatwal, Massachusetts General Hospital's Department of Neurology.

The Harvard Ageing Brain Study at Massachusetts General Hospital assessed physical activity in its participants - 182 normal older adults with an average age of 73.4, including those with elevated b-amyloid - a protein associated with Alzheimer's - who were judged at high risk of cognitive decline.

They did this through hip-mounted pedometers which counted the number of steps walked during the course of the day.

Researchers found that greater physical activity reduced cognitive declines and grey matter volume loss.

In models adjusting for vascular risk, physical activity remained significant, and lower vascular risk was independently associated with slower cognitive decline and grey matter volume loss.

Jasmeer Chhatwal, of the MGH Department of Neurology, and corresponding author of the study, said: "One of the most striking findings from our study was that greater physical activity not only appeared to have positive effects on slowing cognitive decline but also on slowing the rate of brain tissue loss over time in normal people who had high levels of amyloid plaque in the brain."