For endurance athletes, coffee isn’t just a morning ritual – it’s practically part of the training plan!

From the pre-race espresso to post-long-ride/run lattes, caffeine is the unofficial fuel of endurance culture.

Now, science suggests your daily brew might be doing more than sharpening your focus – it could be protecting your heart.

‘A game-changing discovery’

In what researchers are calling a “game-changing” discovery, a new study led by the University of Adelaide and the University of California, San Francisco (UCSF) has found that regular coffee consumption may reduce the risk of atrial fibrillation (AF) — a common heart rhythm disorder linked to stroke, heart failure and premature death.

The study

The DECAF (Does Eliminating Coffee Avoid Fibrillation) trial followed 200 AF patients across Australia, the US and Canada.

Half were asked to drink at least one coffee or espresso a day, while the other half abstained from caffeine entirely.

Their heart rhythms were closely monitored over 6 months.

‘The results are astounding’

“The results were astounding,” says Professor Christopher X. Wong from the University of Adelaide and Royal Adelaide Hospital.

“In contrast to conventional wisdom, we found the coffee drinkers experienced a significant reduction in AF compared to those who avoided coffee and caffeine.”

Researchers reported a 39% reduction in recurrent AF episodes among coffee drinkers.

Caffeine’s ‘positive benefits’

They believe caffeine’s diuretic effect, coffee’s anti-inflammatory compounds, and increased physical activity levels among coffee consumers could all play a role.

“Coffee increases physical activity, which is known to reduce AF,” says senior author Professor Gregory Marcus from the Division of Cardiology at UCSF.

“Caffeine is also a diuretic, which could potentially reduce blood pressure and, in turn, lessen AF risk.

“Several other ingredients in coffee also have anti-inflammatory properties that could have positive effects,” he says.

Published in The Journal of the American Medical Association, the findings may reshape medical advice for AF patients — and give athletes one more reason to enjoy that post-ride flat white guilt-free.