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- If you own the Apple Watch Series 5 and Series 4, then you’ll have access to additional heart rate technology. That’s an electrocardiogram (ECG), which offers a much more detailed picture of your heart rate. The FDA-certified feature is live in the US, and has also now rolled out to 32 countries worldwide.
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Learn how Apple Watch measures your heart rate, and get tips for a more accurate reading.
You can check your heart rate any time using the Heart Rate app. 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.
You can also turn on heart rate notifications, so you know if your heart rate remains above or below a chosen beats per minute (BPM), or to occasionally check for an irregular heart rhythm.
When you use the Workout app, Apple Watch measures your heart rate 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, check your settings.
This information, as well as other data it collects, helps Apple Watch estimate how many calories you’ve burned. In addition, Apple Watch measures your heart rate throughout the day when you’re still, and periodically when you’re walking (Apple Watch Series 1 or later). 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.1 You can control which third-party apps have access to your health data from the Health app in Sources.
The optical heart sensor in Apple Watch uses what is known as photoplethysmography. 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 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 absorption — is greater. Between beats, it’s less. 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 30–210 beats per minute. In addition, the optical heart sensor is designed to compensate for low signal levels by increasing both LED brightness and sampling rate.
The optical heart sensor can also use infrared light. 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).
Apple Watch Series 4 and later and all models of Apple Watch Ultra also have built-in electrodes in the Digital Crown and the back of Apple Watch, which can measure the electrical signals across your heart when used with the Heart Rate app or the ECG app. 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.
To use the electrical heart sensor to measure your heart rate, open the Heart Rate app and place your finger on the Digital Crown. You will get a faster reading with higher fidelity — getting a measurement every second 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 also use the electrical heart sensor to take an ECG with the ECG app.
Start with a good fit. 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. Learn what else affects your reading.
1. Some anomalies may appear in the displayed data, resulting in occasional heart rate measurements that are abnormally high or low.
Features. GPS/GNSS. Compass. Barometric altimeter. Water resistant. 50 meters1. Electrical heart sensor. Second-generation optical heart sensor. International emergency calling 3. Emergency SOS 2. Accelerometer. up to 32 g-forces with fall detection. Gyroscope. Ambient light sensor. Speaker. Microphone. Apple Pay. GymKit. Capacity 32GB.
The Series 5 was also spot-on when testing heart rate. I wore a Polar H10 chest strap to compare results, and during a one-mile walk, the watch recorded 141bpm to the Polar's 140bpm. During a one...
- Analyst, Consumer Electronics
- Apple
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Apr 1, 2019 · If you have an Apple Watch Series 1 or newer, WatchOS 5 is compatible and will work on your watch. The update adds a handful of new features, one of which is the ability to detect a...
Open the Heart Rate app on your Apple Watch. Turn the Digital Crown to Range, Resting Rate, or Walking Average to show your heart rate throughout the day. To see your heart rate data over a longer period of time, open the Health app on your iPhone, tap Browse, tap Heart, then tap an entry.
Sep 10, 2019 · The popular Series 3 (GPS), with built-in GPS, optical heart rate sensor and water resistance, starts at a new low price of $199 and Series 3 (GPS + Cellular) is $299. Apple Watch Series 5 (GPS) is available to order today from apple.com and in the Apple Store app, with availability beginning Friday, September 20 in the US , Puerto Rico , the ...
