Ghostal

davgreg said:

The heart rate function does not require the lead 1 ECG function- the older watches can detect the pule with the LED on the back of the watch.

Yeah, but if he got the alert that might mean that he wasn't in sinus rhythm. There are different types of tachycardia. I used to have a version where my heart beat was super steady... just really really fast. My cousin has a form where his rhythm is both fast and out of whack. The former is more inconvenient, the latter has a higher risk for stroke.