Micro-fluctuations in the time between heartbeats are proving a helpful indicator of mental health, stress levels, exercise ...

Heart Rate Variability (HRV) might be the most accessible—and powerful—predictor of cardiovascular and nervous system health that you are probably not measuring. Today’s letter is dedicated to ...

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 ...

Smartwatches commonly use heart rate variability to monitor stress. Columnist Helen Thomson explores what this metric ...

Heart rate variability (HRV) is more than just a fitness tracker stat—it’s a window into how well your body handles stress, recovers, and adapts. Higher HRV often signals resilience and readiness, ...

Nick Blackmer is a librarian, fact-checker, and researcher with more than 20 years of experience in consumer-facing health ...

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 ...

Brand experts explain that wearable devices' reliability for metrics like distance, heart rate and sleep are continually ...

Beats just released its long-anticipated Powerbeats Pro 2. Despite several new features — including the H2 chip, wireless charging support, ANC and Transparency modes, and a more secure earhook design ...

If you’ve ever glanced at your smartwatch mid-workout and wondered whether your heart rate is impressively low for how hard you’re working, or not high enough because you’re taking it too easy, you’re ...