(06-03-11) Regular exercise increases brain volume, protects against age-related dementia

by Marianne Leigh


(NaturalNews) Everyone fears aging to some extent, even if they age well. But
well beyond wrinkles and sagging skin, the most intimidating loss associated
with aging is that of memory and cognition. These functions rely heavily on a
part of the brain called the hippocampus and have recently been the focus of
study by a team of American researchers. The study found that, in a group of
adults over 65 years of age, regular aerobic exercise accompanies increases in
hippocampal volume, and these gains were related to marked improvements in
memory.

This most recent American study, published in the Proceedings of the National
Academy of Sciences, confirms and expands upon the findings of a previous, more
extensive study done in Italy and published in 2008 in the journal Neurology.

The Italian study followed a group of subjects aged 65 years and older for
four years, using cognitive assessment tests to gauge the health of
participants, and correlating the findings to information about participants'
exercise habits. The study was significant not only because it found dramatic
reductions in development of dementia for those who exercised regularly (a 73%
decrease), it also showed that the intensity of exercise had almost no bearing
on results: exercises like walking, climbing stairs and gardening were just as
effective at staving off dementia as more strenuous activities.

The American study used magnetic resonance imaging (MRI) to assess changes in
hippocampal volume in a group of participants over age 65, who performed
regular aerobic exercise, and in a control group, who did not. Despite the fact
that adults of this age lose 1% to 2% of their hippocampal volume per year,
this study found an average gain of 2% in hippocampal volume among participants
who engaged in regular aerobic walking, and the expected average loss of 1.4%
in the control group. The study additionally found that increases in
hippocampal volume accompanied increases in memory function.

Studies that look at exercise's effect on the brain during aging are ongoing
and very popular, with all signs pointing to the same conclusion: regular
moderate exercise, especially aerobic walking, is an excellent way to fight
cognitive decline. It is similarly associated with a significant decrease in
the development of Alzheimer's, and it has even been shown to slow the
progression of the disease in individuals already affected.

So with all this evidence pointing to the inescapable conclusion that aerobic
exercise is essential for aging well, there's more reason than ever to do your
body this favor. Go take that 30-minute walk today, and then tomorrow, get up
and do it again. Your brain will inevitably thank you.

Sources:

-http://www.pnas.org/content/early/2...
-http://www.neurology.org/content/70...
-http://www.tuftshealthletter.com/Sh...

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