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, ...

From resting heart rate to training zones to heart rate variability, heart rate data gets a lot of glory when it comes to running—and for good reason! But now, some athletes are starting to talk about ...

A recent study showed that the heart rate variability of a dog and its owner adapt to each other during interaction. High heart rate variability is associated with relaxation, while low heart rate ...