Decade-Long Study Reassures Marathon Runners on Heart Health

A big study over 10 years looked at how marathon running affects the hearts of 152 regular runners.

They found that even though the heart gets a bit stressed during a marathon, it bounces back quickly.

Over the 10 years, there was no lasting damage to the heart.

Sometimes, after a marathon, a substance called troponin goes up in the blood, which can make it seem like there's a problem.

But in healthy runners, this is just a sign of hard work, not heart damage.

The study also found that marathon running is very safe, with only about 1 in 100,000 runners having a serious problem.

However, very intense training over many years might cause some scarring in the heart for a few people.

So, for most runners, marathons are safe and the heart gets stronger, not weaker.

But if you feel chest pain or get very out of breath during exercise, you should see a doctor.