“Extreme” Exercise Hurts Hearts
In the July–August issue of IDEA Fitness Journal, we reported on a study that found participation in endurance activities like marathons was not harmful to health. A new study suggests the opposite may be true.
According to research from the Mayo Clinic Proceedings (2012; 87 , 587–95), “Chronic training for and competing in extreme endurance events such as marathons, ultramarathons, [Ironman®] distance triathlons, and very long distance bicycle races, can cause transient acute volume overload of the atria and right ventricle, with transient reductions in right ventricular ejection fraction and elevations of cardiac biomarkers. . . .”
Researchers analyzed data from several studies, both animal and human. Throughout those studies, the authors noticed potentially harmful side effects of training, including atrial fibrillation, higher than expected coronary artery calcium levels and calcified coronary plaque volume, abnormally large atria and myocardial fibrosis.
“In some individuals, long-term excessive endurance exercise training may cause adverse structural and electrical cardiac remodeling, including fibrosis and stiffening of the atria, right ventricle and large arteries,” the authors explained. “For now, on the basis of animal and human data, cardiovascular benefits of vigorous aerobic exercise training appear to accrue in a dose-dependent fashion up to about 1 hour daily, beyond which further exertion produces diminishing returns and may even cause adverse [cardiovascular] effects in some individuals.”
For the latest research, statistics, sample classes, and more, "Like" IDEA on Facebook here.
© 2012 by IDEA Health & Fitness Inc. All rights reserved. Reproduction without permission is strictly prohibited.
IDEA Newsletter Sign-up
|Extreme Interval Training
In this course you'll learn goal-focused intervals and over 50 dynamic exercises and drills to create extensive and intensive training formats.
|Cut to the Core
This is a raw, unedited video filmed live at the 2009 IDEA World Fitness Convention™. Cut to the Core is packed full of core-focused exercises that aim to improve the way you look, feel and live.
|September 2011 IDEA Fitness Journal Quiz 4: Plyometric Training
This continuing education quiz is an in-depth look at plyometric training. Plyometric exercises—jumping, bounding, hopping, arm pushing, and catching and throwing weighted objects such as machine balls—are movements that involve rapid eccentric and concentric muscle actions.