A few of the most important insights are heart rate variability (HRV), which describes the difference in time between the ...

If you’re waking up tired even after seven or eight hours of sleep, your heart rate may be falling too far during the night.

Your smartwatch heart rate is good, but these are better ...

Heart racing suddenly during workouts or daily activity? Doctors explain supraventricular tachycardia (SVT), its symptoms, causes, and when to seek help.

Understanding our body’s target heart rate zones and how they change as we age is crucial for getting the most out of our workouts. If your goal is to burn fat, for example, you’ll want to stay in ...

Working out in the cold doesn't have to be hard ...

Fitness trackers and smart watches are widely popular wearable devices that measure several types of health metrics, including step count, calories burned, sleep quality, Vo2 max and heart rate.

Is a Slow Heart Rate Dangerous? Just as an increased heartbeat can be problematic, a decreased heartbeat is also a dangerous ...

The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

Know how thyroid hormone affects your heart, from heartbeat and blood pressure to risks of hyperthyroidism and hypothyroidism ...

A study challenges the idea that “more exercise is always better,” revealing how elite cyclists may burn through their daily heartbeats faster. This raises new questions about the fine line between ...