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.

Respiratory rate, another metric in the Apple Watch vitals app, shows how many breaths you take per minute. This typically ...

Whoop is a top fitness and health tracker – and one of my favorite devices at Wareable. But if you want to check your heart rate, it can be a little hard to find. I’ve been using Whoop for years – so ...

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, ...

After last year’s revamp, Fitbit has been slowly updating more and more of the mobile app, with Heart Rate stats being the latest redesign. There’s no change to the card in the Today tab, but the page ...

Heart rate variability typically decreases during stressful situations, although the heart rate increases. Managing stress levels can mean a more variable heart rate. Exercise and relaxation ...

The Whoop rival tested.

SEOUL, South Korea, Jan. 19, 2026 /PRNewswire/ -- Digital healthcare startup 6Letters today announced the official launch of ...

Heart rate variability (HRV) typically increases with parasympathetic activation (rest-and-digest response) and decreases with sympathetic activation (fight-or-flight response). The autonomic nervous ...

The rhythm of a healthy heart may seem steady, but underneath that regular thump lies a rich, ever-changing pattern. These beat-to-beat changes, known as heart rate variability, or HRV, reveal much ...

A new study led by researchers from Murdoch University's School of Psychology, Personalized Medicine Center, and Center for Healthy Aging, Health Futures Institute has found that heart rate ...