Slower resting heart rates have been coveted by athletes for years, but new research questions the value of a slower ticker.
When it comes to athletes and bragging rights, slow isn't usually a point of pride. But that's not the case with heartrates. A low resting heart rate, or sinus bradycardia, is a sign of endurance in the fitness world, and it's only recently that researchers have figured out exactly what it is. And the answer is kind of "funny."