Monitor your centre rate with Apple Sentinel

Acquire how Apple Picket measures your middle charge per unit, and get tips for a more authentic reading.

Heart app icon

How to check your heart rate

Heart Rate app showing 68 BPM current rate and 56 BPM resting rate

When Apple Watch measures your heart rate

Heart measurements in the Health app on iPhone and resting heart rate in app on Apple Watch

When you use the Conditioning app, Apple Sentry measures your heart charge per unit continuously during the workout and for 3 minutes after the workout ends to determine a workout recovery rate. If you don't see your heart rate, bank check your settings.

This information, as well as other data it collects, helps Apple Watch approximate how many calories you've burned. In add-on, Apple Sentry measures your center charge per unit throughout the twenty-four hours when you're yet, and periodically when you're walking (Apple Watch Serial 1 or later). Since Apple tree Watch takes these groundwork readings based on your activity, the fourth dimension between these measurements will vary. Apple Watch also calculates a daily resting rate and walking average past correlating background centre charge per unit readings with accelerometer data when sufficient background readings are available.i You can control which 3rd-party apps have access to your health data from the Health app in Sources.

How Apple Watch measures your center rate

The optical centre sensor in Apple Lookout man uses what is known every bit photoplethysmography. This engineering science, while difficult to pronounce, is based on a very unproblematic fact: Blood is red because it reflects red calorie-free and absorbs green light. Apple tree Watch uses greenish LED lights paired with light‑sensitive 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 assimilation — is greater. Between beats, information technology's less. By flashing its LED lights hundreds of times per 2d, Apple tree Watch can calculate the number of times the heart beats each minute — your heart rate. The optical middle sensor supports a range of 30–210 beats per minute. In addition, the optical centre sensor is designed to recoup for low signal levels by increasing both LED brightness and sampling rate.

The optical heart sensor can also employ infrared lite. This mode is what Apple Spotter uses when it measures your eye rate in the background, and for eye rate notifications. Apple Watch uses light-green LED lights to mensurate your eye charge per unit during workouts and Exhale sessions, and to summate walking average and Heart Rate Variability (HRV).

Location of Photodiode sensors, Infrared LEDs, and Green LEDs on Apple Watch Series 6.

Apple Watch Series four, Series 5, Series 6, Series 7, Series 8, or Ultra2 also have built-in electrodes in the Digital Crown and the back of Apple Picket, which tin measure out the electrical signals across your heart when used with the Heart Charge per unit app or the ECG app. When yous place your finger on the Digital Crown, it creates a closed circuit betwixt your eye and both arms, capturing the electrical impulses beyond your chest.

To apply the electric center sensor to measure out your heart rate, open the Centre Rate app and place your finger on the Digital Crown. You lot volition get a faster reading with higher allegiance — getting a measurement every 2d instead of every 5 seconds. You'll see "ECG" in Heart Rate Context when looking at recorded data for Heart Rate in the Health app. You can too use the electrical heart sensor to take an ECG with the ECG app.

The ECG app is currently available only in certain countries and regions. Learn where the ECG app is bachelor.

For best results

Start with a good fit. Even nether platonic conditions, Apple Watch may not be able to go a reliable heart rate reading every fourth dimension for everybody. And for a small-scale per centum of users, various factors may make it impossible to go any centre rate reading at all. But there are things you can do to assist Apple Watch get the about consistent and best heart charge per unit readings possible. Learn what else affects your reading.

ane. Some anomalies may appear in the displayed information, resulting in occasional middle charge per unit measurements that are abnormally loftier or depression.

2. ECG isn't supported on Apple Watch SE.

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