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. As a ...

In TODAY.com's Expert Tip of the Day, a cardiologist explains why a lower resting heart rate can be a good sign of heart health and how to improve this vital sign. Resting heart rate — the number of ...

It's healthy to know your numbers. Learn about resting and maximum heart rates, exercise targets, and when to consult a doctor about heartbeat irregularities.

Apple Watch heart rate tracking now rivals medical-grade devices when settings and calibration are optimized. Using advanced optical sensors with green LEDs, Series 4 and newer models continuously ...