Elite cyclists

Elite athletes' heart function

Do genes that code athletic heart enlargement carry a risk of future heart problems, new study asks?

18 December 2023

A new landmark study involving 281 elite athletes from Australia and Belgium has revealed one in six have measures that would normally suggest reduced heart function.

Genetic analysis revealed that those athletes also had an enrichment of genes associated with heart muscle disease. Thus, a genetic predisposition may be ‘stressed’ by exercise to cause profound heart changes. The long-term consequences will continue to be evaluated in this international collaboration.

Associate Professor André La Gerche, who heads the Heart, Exercise and Research Trials (HEART) Laboratory, that is jointly supported by St Vincent’s Institute of Medical Research in Melbourne and the Victor Chang Cardiac Research Institute, says the findings highlight the need for far closer monitoring of the heart health of elite athletes and could one day lead to genetic testing being part of their health screening.

Associate Professor André La Gerche

A/Prof La Gerche says: “We have long known that elite athletes have very different hearts to the general population. Exercise promotes profound heart changes. The heart is large in all elite athletes but there is still considerable variation ranging from large to enormous. The long-term significance of the most extreme changes is not yet certain.

“We discovered that one in six athletes had reduced heart pumping action, as well as showing for the first time the role genetics plays in heart function in these athletes. It’s vital that we monitor these athletes over the coming years to see the long-term impact on their health, which is still to be played out.

“We want to keep our athletes healthy and prevent them from suffering a sudden cardiac arrest. The better we understand the athlete's heart, the more we will be able to identify risks in advance of tragedy.”

The team of international researchers has now recruited more than 400 elite endurance athletes, that includes winners of the world's biggest cycling races. The analysis on the first 281 athletic men and women was performed using the same state-of-the-art exercise and heart imaging in six cities across Australia and Belgium. It involved undertaking genetic testing, as well as analysing their heart function and structure in specially designed heart exercise laboratories. The results were published in Circulation.

Key findings

Professor Diane Fatkin, of the Victor Chang Cardiac Research Institute, who undertook the genetic analysis of the athletes alongside Associate Professor Eleni Giannoulatou, says this study was the first in the world to look at the role of genetics in susceptibility to DCM in athletes.

“The phenomenon of the athletes’ heart has long been known, but we were the first team to investigate the role an athlete's genetic makeup plays in their heart function and structure. What we have found is that there are far more profound changes than thought, and that a high number of these athletes do have altered heart function,” says Professor Fatkin.

“It’s very important we don’t think of these athletes as having sick hearts because they can still function at a very high level. But we don’t know what the long-term effect will be and if this means these athletes will go on to develop cardiomyopathy.”

A/Prof La Gerche says it is now vitally important to follow this same group of athletes over the next 25 years to see if they do go on to develop DCM.

“Regular exercise is associated with clear health benefits, but maybe there is a small group with a genetic predisposition in whom that benefit is less. It might even be potentially dangerous for them to exercise at this incredibly high level,” says A/Prof La Gerche.

“Our overall hope from this research is that we can make all sport safe for all participants. Understanding the interplay between genetic traits and high-dose exercise is a step towards this goal”.

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Acknowledgement of Country

The Victor Chang Cardiac Research Institute acknowledges Traditional Owners of Country throughout Australia and recognises the continuing connection to lands, waters and communities. We pay our respect to Aboriginal and Torres Strait Islander cultures; and to Elders past and present.

Victor Chang Cardiac Research Institute - The Home of Heart Research for 30 Years