Open the app, then wait for Apple Watch to measure your heart rate.

You can also view your resting, walking, breathe, workout, and recovery rates throughout the day.

To easily open the app, add the Heart Rate complication to your watch face or add the Heart Rate app to the Dock.

Irregular rhythm notifications are available only with watchOS 5.1.2 or later.

To enable irregular rhythm notifications, the notifications must be available in your country or region and you must be in the country or region where you purchased your device.

Since Apple Watch takes these background readings based on your activity, the time between these measurements will vary.

Apple Watch also calculates a daily resting rate and walking average by correlating background heart rate readings with accelerometer data when sufficient background readings are available.

You can control which third-party apps have access to your health data from the Health app in Sources.

This technology, while difficult to pronounce, is based on a very simple fact: Blood is red because it reflects red light and absorbs green light.

Apple Watch uses green LED lights paired with lightsensitive photodiodes to detect the amount of blood flowing through your wrist at any given moment.

When your heart beats, the blood flow in your wrist and the green light absorption is greater.

By flashing its LED lights hundreds of times per second, Apple Watch can calculate the number of times the heart beats each minute your heart rate.

The optical heart sensor supports a range of 30210 beats per minute.

This mode is what Apple Watch uses when it measures your heart rate in the background, and for heart rate notifications.

Apple Watch uses green LED lights to measure your heart rate during workouts and Breathe sessions, and to calculate walking average and Heart Rate Variability (HRV).

When you place your finger on the Digital Crown, it creates a closed circuit between your heart and both arms, capturing the electrical impulses across your chest.

You will get a faster reading with higher fidelity getting a measurement every second instead of every 5 seconds.

You can also use the electrical heart sensor to take an ECG with the ECG app.

Even under ideal conditions, Apple Watch may not be able to get a reliable heart rate reading every time for everybody.

And for a small percentage of users, various factors may make it impossible to get any heart rate reading at all.

But there are things you can do to help Apple Watch get the most consistent and best heart rate readings possible.

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