You might be familiar with HRV—heart rate variability—as a popular training tool for workouts and a biomarker for measuring exercise recovery. Beyond exercise tracking, heart rate variability has a ...

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 ...

New research, presented today at the European Academy of Neurology (EAN) Congress 2025, has uncovered a powerful link between nighttime heart rhythm and future health conditions, even in people with ...

Heart rate variability during sleep can predict stroke, depression or cognitive dysfunction years in advance, according to new research presented at the European Academy of Neurology Congress. The ...

Plus, doctors’ number-one pick and their take on the devices.

(Helsinki, Finland, Saturday, 21 June 2025) New research, presented today at the European Academy of Neurology (EAN) Congress 2025, has uncovered a powerful link between nighttime heart rhythm and ...

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 ...

Older adults who sleep in bedrooms warmer than 75 degrees Fahrenheit face measurably higher odds of overnight cardiovascular strain, according to a study of 47 community-dwelling seniors tracked over ...

Apple Watch users who wake up to inconsistent sleep data have a real problem: the device tracks sleep using optical ...