BERKELEY, Calif., Feb 11, 2009 (UPI via COMTEX) -- Vigorous exercise reduced
the risk of both cataracts and age-related macular degeneration, U.S.
researchers said.
Two studies by the U.S. Department of Energy's Lawrence Berkeley National
Laboratory tracked approximately 41,000 runners for more than seven years.
"The studies suggest that people can perhaps lessen their risk for these
diseases by taking part in a fitness regimen that includes vigorous exercise,"
study leader Paul Williams said in a statement.
A cataract -- a cloudy opacity of the eye lens -- is the leading cause of
blindness and more than one-half of U.S. adults 65 and older suffer from some
form of cataracts. Age-related macular degeneration -- damage to the retina --
is the leading cause of irreversible vision loss in older white Americans,
affecting 28 percent of people age 75 and older, Williams said.
Williams analyzed data collected in the National Runners' Health Study, which he
established in 1991 to determine the health benefits of running.
He tracked some 29,000 male runners and 12,000 female runners for more than
seven years and of these 733 men reported being diagnosed with cataracts. Too
few women reported cataracts to track.
The studies, published in Investigative Ophthalmology and Visual Science, found
men who ran more than 5.7 miles per day had a 35 percent lower risk of
developing cataracts than men who ran less than 1.4 miles per day.
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