Marathon Training Lowers Heart Disease Risk

Impact of Physical Activity on CV Disease
March 29, 2014
American College of Cardiology
http://www.cardiosource.org/Home/News-Media/Publications/Cardiology-Magazine/2014/03/Impacts-of-Physical-Activity-Screen-Time-Diet-Drinks-and-Weather-on-CV-Disease.aspx

Another study of physical activity concluded that marathon training improved cardiovascular risk factors among middle-aged, recreational runners who prepared for the Boston Marathon.
Jodi L. Zilinski, MD, of Massachusetts General Hospital led the study of 45 male runners, ages 35 to 65, who trained for 18 weeks in advance of the 2013 marathon.
Their race preparation led to significant changes in cardiovascular risk: LDL was reduced by five percent overall among participants; total cholesterol fell four percent and triglycerides fell 15 percent.
The men collectively showed a four percent increase in peak oxygen consumption.

“Participants experienced cardiac remodeling,” Zilinski said. “Even with a relatively healthy population that was not exercise naive.”

journalistic version:
Marathon Training Lowers Heart Disease Risk In Middle-Aged Men
March 27, 2014
http://www.npr.org/blogs/health/2014/03/27/295252726/marathon-training-lowers-heart-disease-risk-in-middle-aged-men

Cardiac Arrest during Long-Distance Running Races
Jonathan H. Kim, M.D., et al.
N Engl J Med 2012; 366:130-140January 12, 2012
http://www.nejm.org/doi/full/10.1056/NEJMoa1106468
Conclusions:
Marathons and half-marathons are associated with a low overall risk of cardiac arrest and sudden death.
Cardiac arrest, most commonly attributable to hypertrophic cardiomyopathy or atherosclerotic coronary disease, occurs primarily among male marathon participants; the incidence rate in this group increased during the past decade.