Medical Study News (December 15, 2005) - According to an article on News-medical.net, citing a randomized controlled study published in the December 2005 American Journal of Respiratory and Critical Care Medicine, a two-gram fish oil supplement given daily to 26 elderly persons prevented a decline in heart rate variability associated with same-day exposure to indoor particulate matter, compared to the control group given soy oil supplements.

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Article on News-medical.net