I would recommend you get a stress test. I am not a doctor, but your tracings look abnormal and your ST segment is raised – a lot..

Agree with kallseN that it’s worth further investigation. On the plus side a lot of athletes would get an abnormal ecg result based on voltage criteria – I have myself, several times. However your QRS wave is ba

…is mainly negative and the st segment warrants looking at.

…in fact looking at the overnight ecg as magnified as possible i would query long qt. Apparently the QT segment durations in males should be between 350-430 msecs and if >=450 msecs you should possibly get it ruled out as your QT segment durations seem to be consistent around 460-480 msecs. Currently my own heart strain reading seems to vary from -0.07 to +0.06 so barely budget from the blue zone. I used to compete myself at road x country running and bought the x2 to keep an eye particularly on heart strain and HRV as I’ve also had some palpitations / pvc’s- which I have felt myself and picked up by the x2 – though they only number half a dozen or so during a 80 min interval session across the xtrainer, concept 2 rower and stairmaster stepper. I’m now 65 years old, though have always kept active even after retiring from competition. An ECG at my GP was abnormal on voltage criteria and came up with a diagnosis of LVH. Long story short, I paid for a 2nd opinion from a cardiologist and had a week with a hotlter monitor incl during exercise

..and all the flag posts may be because of your low HR . Apparently the typical RR interval should be between 600-1200 msecs and because you are bradycardic yours is about 1300 msecs , so I suppose it depends on exactly what the x2 algorithm is checking. LAFB may also be worth ruling out as that seems to show similarities to your ECG ie T wave higher than R wave and mainly negative QRS and upsloping ST segment

…and just noticed on my own ecg during sleep, and mine also shows lots of flag post warnings in the couple of hours before I got up – and for a lot of that my HR was 45-46 bpm, so it may be the slow bradycardia sinus rhythm that’s triggering these. My heart strain did stay mainly in the blue /green during the night though.