Waking up your Apple Watch to see “your heart has shown signs of an irregular rhythm suggestive of atrial fibrillation” might come as a shock. While your watch can send you warnings if it detects a fast or low heart rate, those messages are pretty vague, while the abnormal arrhythmia alert can downright scary. So what should you do if you receive one of these AFib notifications?

Before going further, let’s talk heart a little bit. During activity such as exercise, your target heart rate will be anywhere between 100 and 175 beats per minute (bpm), depending on your age. But that’s not normally… more


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