Your HRV, also known as Heart Rate Variability, is, according to Dr. Elisabetta Burchi, about to “become the next vital sign we all track.”
If you haven’t heard of HRV before, this refers to the variation in the intervals between your heartbeats, rat… [5786 chars]
A psychiatrist says this one thing about your heart rate could be the secret to living longer – and it might trump your step count
