Bradycardia, a slow resting heart rate, is healthy for elite athletes — but it can be dangerous if not caused by exercise ...

A higher HRV may indicate better physical fitness and resilience to stress, while a lower HRV is associated with anxiety and ...

Heart rate variability (HRV) is the difference in the timing between each heart beat. Normal HRVs will vary depending on age, from 60-90 milliseconds for teenagers to 40-60 for people in their 50s.

Heart rate variability is one of the main things your smartwatch or fitness tracker measures. Here's what it means.

Whether due to stress or an intense cardio workout, most of us have felt our heart racing from time to time. A rise in your heart rate can be perfectly normal given outside circumstances. However, ...

We know the beat of our heart varies over time, increasing with exertion and slowing with rest or meditation. But, stable as those variations may appear, they vary even within those intervals. Dr.

Only a few wearables deliver accurate heart metrics that can help you make training decisions. A new study reveals which ones measure up.