We missed posting Item # 22 in today's Digest. It is listed below:

22. Even a healthy heart can grow weary of exertion:
Among the human heart's many virtues is its simple doggedness.
The heart never stops, from long before birth until ... well, death. It does get
a rest period in each beat when it is filling with
blood and not pumping. But that lasts only four-tenths of a second, on average.
Then it's time to go to work again.
For a long time, biologists thought the heart never got tired unless there was
something wrong with it, such as damage from a heart
attack. But now a study of an unusual - some would say crazy - group of people
has finally dispelled that myth.
It turns out that if you flog the heart long and hard enough, it will tire. A
little.
Euan A. Ashley, a cardiologist at Stanford University, and a group of English,
Scottish, Austrian and American colleagues, studied
people who finished the 2001 Adrenalin Rush, a 300-mile adventure race in the
Scottish Highlands.
More...from the Daily Camera at:
http://www.dailycamera.com/bdc/health_and_fitness/article/0,1713,BDC_2431_488381\
2,00.html

Our apologies for the oversight.



Ken Parker
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