Cold Air Chills Heart's Oxygen Supply, Making Snow Shoveling Dangerous for Some People

http://www.sciencedaily.com/releases/2012/02/120228123941.htm

ScienceDaily (Feb. 28, 2012) — People with heart disease may not be able to compensate for their bodies' higher demand for oxygen when inhaling cold air, according to Penn State researchers, making snow shoveling and other activities dangerous for some.

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