Even Light Exercise May Reduce Alzheimer’s Risk

A new study found that in older adults, an increased physical activity level, including light-intensity physical activity (LPA), was associated with a reduced risk of dementia.

The study looked at 62,286 participants who were aged 65 and older and had no evidence of dementia at the beginning of the study. Participants were followed from January 2009 until December 2013 and were assessed using a standardized, self-reported questionnaire that evaluated their physical activity level in terms of frequency, intensity, and duration.

Comparing the group with the highest level of exercise to the lowest showed a dramatic difference in terms of dementia risk, with a 28% reduction in dementia risk. Interestingly, compared with inactive individuals, all other groups (insufficiently active, active, and highly active) showed a 10% reduced dementia risk regardless of age, sex, or other comorbidities. Compared with total sedentary behavior, even a low amount of physical activity (10 minutes twice a week) was associated with reduced dementia risk.

Even a modest amount of physical activity may be an attainable lifestyle modification and prevention strategy for older adults at risk for dementia, and promotion of even light-intensity physical activity may reduce their risk of dementia.