Since the Apple Watch series 4, the heart rate sensor (pulse oximeter) in combination with the Digital Crown can also make a heart film (electrocardiogram).
Such an ECG monitors the electrical activity of the heart muscle and can be used to detect irregularities. This sensor is not only interesting for an ECG, you can also use it to measure the heart rate more accurately.
Measure heart rate more accurately with Apple Watch
- Open the heart rate app on your Apple Watch (Ultra, series 4 or newer)
- If necessary, tap ‘Current’
- Place your finger on the Digital Crown
- Your heart rate is now measured
You will notice that your heart rate is updated much more often and the measurement is more accurate. The pulsation is now measured every second, instead of five seconds when you only use the optical heart rate sensor.
Why is this more accurate?
Apple explains in detail why a measurement is more accurate in this way. The Apple Watch also has built-in electrodes in the back and in the Digital Crown. These electrodes can measure the electrical signals in your heart when you use the Heart Rate or ECG app. When you place your finger on the Digital Crown, it creates a closed circuit between your heart and arms, allowing the electrical signals in your chest to be recorded.
Because the Apple Watch SE first and second generations do not have an ECG function, you cannot apply the above trick to these models.
Apple Watch electrocardiogram
One of the biggest and most important features of the Apple Watch Ultra, Series 4 or later is the ability to take an electrocardiogram (ECG), also known as an ECG. The Apple Watch contains an electrocardiograph that can record and analyze the heart rhythm. For example, the Apple Watch can warn you of deviations thanks to this technology. Click on the link below to view our ECG guide for Apple Watch so you can get started right away.