REPs UK REPS NZ

Novice Marathoners Beware

by Ryan Halvorson on Dec 12, 2013

Making News

According to www.findmymarathon.com, 529,435 people finished marathons in the United States and Canada in 2012. Although marathon running is a popular sport, recent research warns that “amateur runners” who participate may increase their cardiac risk.

The study, published in the Canadian Journal of Cardiology (2013; 29 [10], 1269–76), recruited 20 recreational long-distance runners, aged 18-60, who were planning to run the Quebec City Marathon. Subjects had no known history of heart disease and were examined at four intervals throughout the study: 6–8 weeks before the race; on race day; 48 hours after the race; and 3 months after the race.

Researchers observed that in half of the runners, the marathon triggered decreases in left and right ventricular function, sometimes resulting in swelling and reduced blood flow in the heart. The decreased function was more prominent in those with “poorer peak training distance, training time and fitness level.”

“Change in global left ventricular ejection fraction was associated with VO2max,” the authors explained. “Overall, 36% of segments developed edema, 53% decreased function and 59% decreased perfusion. Significant agreement was observed between segment[s] decreasing function, decreasing perfusion, and developing edema.”

The researchers added that the changes were reversible by the 3-month mark.

“Completing a marathon leads to localized myocardial edema, diminished perfusion, and decreased function occurring more extensively in less trained and [less] fit runners. Although reversible, these changes might contribute to the transient increase in cardiac risk reported during sustained vigorous exercise,” the authors concluded.

Topics

Running Safety

IDEA Fitness Journal , Volume 11, Issue 1

© 2014 by IDEA Health & Fitness Inc. All rights reserved. Reproduction without permission is strictly prohibited.

About the Author

Ryan Halvorson

Ryan Halvorson IDEA Author/Presenter

Ryan Halvorson is the chief content officer for Fit Scribe Media (www.fitscribemedia.com); contributing editor for IDEA Health & Fitness Association; director of group training at Bird Rock Fit in La ...

0 Comments

Trending Articles

Eight Fascinating Facts About Fascia

Fascia has been enjoying the limelight in the fitness industry as one of the hottest topics in recent conference programming, workshops and ...

Nutrition Strategies for Stress and Pain Management

Stress and pain diminish quality of life for millionsofAmericansandcostbillionsin healthcare expenses and lost wages.

Sample Class: Farmhand Fitness

Several years ago, I attended an IDEA World Fitness Convention™ session led by Michol Dalcourt, director of the Institute of Motion. D...

Breathe to Lose Weight?

When a person loses weight, have you ever wondered where it goes? Scientists at the University of New South Wales in Australia have put toge...

Liver Injury Due to Herbals and Dietary Supplements Is Up

If you regularly take herbals and dietary supplements, it may be time to reevaluate why you take them and what the potential cost to your he...

Cardio and Creative Core

Group fitness participants can’t seem to get enough of creative core and cardiovascular exercises. If you need innovative ideas to cha...

Concurrent Training Can Jeopardize Strength Gains

A lot of people do concurrent training— cardio and strength training within the same session—because it seems to achieve multiple goals at the same time. It’s also a proven fat-burne...

Does Exercise Order Really Matter in Resistance Training?

Research on resistance training design finds that the chief variables include intensity, volume, recovery between sets and exercises, workout frequency, equipment and speed of movement (Simão et al....

Coronary Artery Disease: What Every Fitness Professional Needs to Know

Developing a thorough understanding of coronary artery disease (CAD) can help fitness professionals fight one of the world’s deadliest...

Stress-Fighting Foods

Stress and pain diminish quality of life for millions of Americans and cost billions in healthcare expenses and lost wages.

Next