Everything you need to know about photoplethysmography (PPG), the technology behind heart rate measurements in fitness ...

But it turns out more subtle color changes occur at rest as the heart pumps blood around the body. The ebb and flow of blood ...

Get to know the link between your effort level and your heart rate. Plus, how to use heart rate to your performance advantage ...

The Garmin HRM-Pro Plus is, instead, a heart rate chest strap monitor with a ton of fancy features all wrapped up in a simple ...

Heart rate monitor straps are pretty much what they sound like. It's an elastic strap that you wear around your chest that's equipped with electrodes, which then transmit your heart rate data ...

Bradycardia, or a heart rate that is too slow, can be a serious condition, especially if the heart is not pumping enough oxygen-rich blood throughout the body. Here's what medical experts consider ...

Data from wearable heart rate monitors is averaged out for each minute. Tracking begins at 6 p.m. ET and ends 30 minutes following each player's selection. Tap on a player's photo above to view ...

While we praised Powerbeats Pro 2 in our review, we noted that the heart rate sensor only activates on the iPhone when you don’t have an Apple Watch paired. On Android, it’s a bit different.