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, ...

This article was originally featured on The Conversation. Your heart beats around 100,000 times every day. Heart rate is a key marker of cardiovascular activity and an important vital sign. But your ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. As a cardiovascular physiologist, I measure ...