It’s been known for decades that heart rate variability (HRV) during labor signals how a fetus is responding to stress. Lower HRV—a lower variation in heartbeats—is even a risk factor for sudden ...
It turns out, there’s a link between your hydration and heart rate variability. Here’s a look at the science. The post ...
Fitness trackers moved from niche gadgets to everyday companions. Metrics that once lived in labs—heart rate, pace, HRV, ...