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“Yeah,
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, I brought my heart rate down from 80 to 45 beats per minute resting….” The boasting drawl came from behind me as I waited in the starting corral of the Rock and Roll Marathon in Raleigh,
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, N.C. It may seem like an odd comment to those not in endurance sports,
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, but for distance runners,
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, cyclists, swimmers and triathletes, a sluggish resting heart rate can be a matter of pride.
No one knew exactly what causes athletes to have this slow heartbeat, a condition called sinus bradycardia. Now,
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, a study by cardiac physiologist Alicia D’Souza and colleagues from the University of Manchester in England finds the answer in certain “funny channels” in the sinoatrial node, the pacemaker for the heart. The slower heart rate isn’t as funny — it has fewer funny channels to transmit current that controls the activity of the heart cells. The results suggest a mechanism for sinus bradycardia in athletes, and also might help scientists understand why athletes can have heart problems later in life.
The study started close to home. “I had a Ph.D. student,
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, Will Morris,” says Mark Boyett,
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, a cardiac physiologist and lead author of the study. “He’s a cardiologist and he’s also a very keen cyclist. He was telling me that his heart rate when he is race-fit is 42 beats per minute!” A normal heart beats at around 70 beats per minute at rest. A professional athlete in top condition will cut that number in half.
Many amateur athletes wear their reduced heart rates

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