Heart rate variability (HRV) measures the fluctuations in time between heartbeats. While it isn’t a health metric you need to overthink, HRV is an indicator of how well the body can adapt to and ...

Fitness trackers and smart watches are widely popular wearable devices that measure several types of health metrics, including step count, calories burned, sleep quality, Vo2 max and heart rate. As a ...

Variance is a measurement of the spread between numbers in a data set. Investors use the variance equation to evaluate a portfolio’s asset allocation.

These days, it may seem like there’s a million different data points that you’re supposed to keep track of—hello, steps, sleep, and recovery scores!—and it’s difficult to know which ones are worth ...

Thanks to wearable devices, you can use all sorts of metrics to keep track of your health. You can check your weight, blood pressure, the number of steps you take, heart rate and more as you go about ...

Did you know there’s a number that might let you know how stressed you are, whether you have a cold coming on and how to get into the zone if you’re about to present at a big meeting? You can find ...