Frankly, it’s not easy being Fitbit right now. Dogged by server crashes in the past month, the wearable that measures your heart rate, steps and sleep (among other things) has seen more than its share ...

Heart rate variability measures the variation in time between successive heartbeats, providing insights into the balance between the sympathetic and parasympathetic nervous systems, which influence ...

One of our biggest complaints about Fitbit products for years is the fact that you'll need to pay the $10 monthly fee to see your historical data. For example, you could only see up to seven days' ...

This article was originally featured on The Conversation. Your heart beats around 100,000 times every day. Heart rate is a key marker of cardiovascular activity and an important vital sign. But your ...

If you wear a fitness tracker, you've likely seen a stat labeled "HRV" pop up on your screen. But what does it mean, and does it matter? Short for heart rate variability, HRV has become a popular ...

My regular workout routine is filled with a whole host of different modalities—from running to lifting to indoor cycling—and I love health data. So it’s no big surprise that I’m a huge fan of fitness ...