Heart rate variability (HRV) is the variation in the time between two consecutive heartbeats over a specific period. Doctors may use HRV as an indicator for certain aspects of a person’s health, ...

One of the most useful features of owning a smartwatch, right up there with being able to get notifications that vibrate on your wrist instead of your phone making a noise, is their ability to monitor ...

Overview:  Wearables in 2026 use AI to predict health risks and changes early, helping users act before problems become ...

That tension becomes especially clear with heart rate zone training, a popular five-tier system that endurance athletes use to measure effort and fine-tune performance. The well-known formula is ...