What is heart rate variability (HRV)? As popular as the metaphor may be, a healthy heart doesn’t beat as regularly as a metronome. In fact, it changes its rhythm with each beat. Heart rate variability ...

Men's Fitness aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission. Heart rate variability, or HRV, is quickly becoming one of the ...

New research from Murdoch University has found that using a heart rate monitor can help improve PTSD and chronic pain symptoms. A new study led by researchers from Murdoch University’s School of ...

This article was made possible by the support of Yakult and produced independently by Scientific American’s board of editors. Earlier this year I got an Oura ring to track the state of my health. Soon ...

Menstrual cycle phases influence heart autonomic regulation, showing HRV variations, yet muscle performance and mood states ...