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Good physical function linked to Alzheimer's delay

SEATTLE--The first signs of dementia--including Alzheimer's disease--may be physical, rather than mental, according to a joint study between Group Health Cooperative and the University of Washington reported in the May 22 Archives of Internal Medicine.

This study followed 2,288 Group Health members age 65 and older for six years. At the start, none showed any signs of dementia or Alzheimer's disease. The researchers contacted the participants every two years, assessing physical and mental functioning. By six years, 319 participants had developed dementia, including 221 with Alzheimer's disease. The participants whose physical function was higher at the start of the study were three times less likely to develop dementia than were those whose physical function was lower.

"Everyone had expected the earliest signs of dementia would be subtle cognitive changes," said Eric B. Larson, MD, MPH, director of Group Health Center for Health Studies. "We were surprised to find that physical changes can precede declines in thinking." What is considered a brain disease may be intimately connected to physical fitness, he added.

In the study, the first indicators of future dementia appeared to be problems with walking and balance. A weak handgrip may be a later sign of the development of dementia in older people.

The National Institute on Aging supported this study. Coauthors are Li Wang, MS, of the Veterans Affairs Puget Sound Health Care System; and James D. Bowen, MD, and Gerald van Belle, PhD, of the University of Washington.

In a recent report, in the Annals of Internal Medicine in January 2006, some of these researchers found that when people exercised regularly, they were less likely to develop dementia, including Alzheimer's disease. The cause of this association was not clear, though. This newer study suggests a possible pathway: that regular exercise may help stave off dementia by improving and maintaining physical conditioning.
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Contact: Rebecca Hughes
hughes.r@ghc.org
206-287-2653
Group Health Cooperative Center for Health Studies
22-May-2006


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