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Heart rate

Adapted from Wikipedia · Explorer experience

A heart activity chart showing normal electrical signals, helpful for learning about how hearts work.

What Is a Heart Rate?

A heart rate is how many times your heart beats in one minute. We call this beats per minute, or bpm. Your heart works hard to give your body what it needs, like oxygen.

When you rest, your heart beats slower. When you play or run, it beats faster to give your body more energy.

Normal Heart Rates

For most kids and adults, a normal resting heart rate is between 60 and 100 beats per minute. Some athletes who exercise a lot might have resting heart rates as low as 40 to 60 beats per minute because their hearts are strong.

Feeling Your Heart

You can feel your heart’s beat by finding your pulse. Common places to feel your pulse are your wrist, inside your elbow, your neck, and your chest. Doctors also use special machines to check heart rates very exactly.

Why Heart Rates Change

Your heart rate changes depending on what your body needs. It goes up when you’re playing, excited, or warm. It goes down when you’re resting or relaxing. Staying healthy helps keep your heart rate just right.

Images

Diagram showing how the nervous system controls the heart.
Illustration showing how the heart’s electrical system works during a normal heartbeat.
A smart and friendly dolphin used by the United States Navy for marine mammal programs.
Scientific graph showing how a dolphin's heart rate changes during different breath-holds.
A chart showing how heart rate changes with breathing — useful for learning about body signals!
Chart showing how maximum heart rate changes with age, useful for learning about fitness and health.
A close-up of a Suunto heart rate monitor watch being worn on a wrist.
A heart rate monitor used to track heartbeats, helpful for learning about health and fitness.

Related articles

This article is a child-friendly adaptation of the Wikipedia article on Heart rate, available under CC BY-SA 4.0.

Images from Wikimedia Commons. Tap any image to view credits and license.