Exercise Slows Development of Alzheimer's-Like Brain Changes in Mice

Physical activity appears to inhibit Alzheimer's-like brain changes in mice, slowing the development of a key feature of the disease, according to a new study. The research demonstrated that long-term physical activity enhanced the learning ability of mice and decreased the level of plaque-forming beta-amyloid protein fragments, a hallmark characteristic of Alzheimer's disease (AD), in their brains.

A number of population-based studies suggest that lifestyle interventions may help to slow the onset and progression of AD. Because of these studies, scientists are seeking to find out if and how physically or cognitively stimulating activity might delay the onset and progression of Alzheimer's disease. In this study, scientists have now shown in an animal model system that one simple behavioral intervention, exercise, could delay, or even prevent, development of AD-like pathology by decreasing beta-amyloid levels.

Results of this study, conducted by Paul A. Adlard, Ph.D., Carl W. Cotman, Ph.D., and colleagues at the University of California, Irvine, are published in the April 27, 2005, issue of