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The Virginia team collected three years of exercise data on more than 2,200 men enrolled in Honolulu-Asia Aging Study. At outset of study, none of men had been diagnosed with dementia or conditions that would prevent them from walking (such as stroke or Parkinson's disease). Over course of several years, two follow up examinations were conducted to assess neurological health.
Almost 160 of men developed dementia during study period. Researchers found that men who walked between a quarter mile and one mile per day had a lower risk of dementia than those who walked less than a quarter mile each day. But in case of this study, more was clearly better because men who walked less than a quarter mile per day had nearly TWICE risk of dementia compared to those who walked more than two miles each day.
------------------------------------------------------------ Walking cholesterol down ------------------------------------------------------------
What is it about taking a daily walk that might prevent cognitive decline and dementia? It could have something to do with cholesterol's association to Alzheimer's disease. Previous research has suggested that high cholesterol levels may increase level of a certain protein that is abnormally processed by people with Alzheimer's disease. This abnormal processing sets off a chain reaction that causes a peptide to accumulate and form tangles that can kill brain cells.
A Georgetown University Medical Center study showed how high cholesterol levels significantly increase rate at which these tangles are formed. In addition, researchers concluded that high cholesterol also increases production of a different protein that transports cholesterol out of cell. And while that's a normal function, in this situation it results in an unfortunate increase of free cholesterol, which has a toxic effect on nerve cells.
Of course, daily exercise is one of best and safest ways to control cholesterol levels. Neither Harvard nor Virginia researchers speculated on why regular exercise through walking might have helped prevent cognitive decline and dementia, but it seems likely that reducing cholesterol levels may have come into play.
Pauline Robinson is a Nutritional and Metabolic Bio Typing Consultant for HealthSmart Nutrition
For Metabolic Bio Typing info go to www.air-water-nutrition-healthsmart.com