The normal resting heart rate varies by age. In adults, any number between 60 and 100 beats per minute (bpm) is considered a good resting heart rate. Babies and young children have higher resting ...

You’re familiar with the feeling of your heart pounding in your chest, your blood pulsing through your veins with increasing frequency when you’re scared, stressed, or sweating it out at the gym.

Healthy hearts are adaptable, and heartbeats exhibit complex variation as they adjust to tiny changes in the body and environment. Researchers have applied a new way to measure the complexity of pulse ...