Читать книгу Apple Watch For Dummies - Marc Saltzman - Страница 51

Apple Watch Series 4, Apple Watch Series 5, and Apple Watch Series 6 models all include an electrical heart rate sensor that can take an electrocardiogram (ECG) using an ECG app; the built-in sensor and the electrodes are included in the Digital Crown button. You take an ECG reading by placing a finger on the Digital Crown while wearing Apple Watch and the reading is completed within just 30 seconds. The ECG app tracks whether your heart is beating in a regular pattern or if you have signs of atrial fibrillation, a clear indicator of serious health problems.