ECG app on iWatch doesn’t work

sharandipity wrote:

The ECG app on the iwatch doesn’t go beyond 29 seconds in countdown mode. Please help

See Take an ECG with the ECG app on Apple Watch - Apple Support

All the criteria for a successful ECG must be satisfied during the entire recording time period. I have had some challenges getting an ECG to complete and found it involved the following:

• Sitting very still with arm positioned just as described in Apple's documentation
• Secure and good fit on the watch and band on the arm/wrist. For me this involved tightening the band and shifting it a little bit away from the hand, further up the arm, maybe a cm or so. And rotating the watch so that its sensors sit directly on the middle of the arm/wrist area, mine was initially a bit rotated out and sitting slightly more on the bone. When I made these adjustments, the ECG worked.
• My resting pulse is in the 40s, which is too low for an ECG, it requires at least 50. My solution for this was to do the ECG at the conclusion of a bicycling workout. When the workout ends, my heart beat rapidly decreases but I got the ECG in just before it dropped below 50 (it was at 51).

I believe that the ECG measurement is a much more delicate measurement than the pulse measurement.