The ECG detectors on watches are getting better, but they actually work like a pulse oximeter rather than an actual ECG. This is by looking at the pulse wave and sensing whether or not it is regular. As you’re young, any sinus arrhythmia (which is sinus rhythm made slightly irregular by vagal tone from respiration) can be called AF accidentally by the watch. In saying that, do you have a history of AF? VT and AF have quite different pathologies.
The ECG detectors on watches are getting better, but they actually work like a pulse oximeter rather than an actual ECG. This is by looking at the pulse wave and sensing whether or not it is regular. As you’re young, any sinus arrhythmia (which is sinus rhythm made slightly irregular by vagal tone from respiration) can be called AF accidentally by the watch. In saying that, do you have a history of AF? VT and AF have quite different pathologies.
source - cardiac physiologist