Hello there, thanks for the good question. First of all, based on your story, I doubt there is anything serious going on. At first, you had a sudden heart rate jump and then it improved after training. This is normal because it was caused by deconditioning and it improved after continuous training meaning the deconditioning is resolved. This is a normal physiological response. If you have no symptoms whatsoever and maintain good functional capacity, I doubt any serious cardiac problems. If you are really paranoid, I guess you may undergo an echocardiogram to rule out any heart structural problems. Any again, I doubt the echocardiogram will show any significant problem.
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It is not a slow increase. If I walk very slowly, or run my pulse will go to 120 as if there is only one speed. If I run fast then suddenly (in an instant) it will start increase to 220 (see a copy of the graphs in the links)
Other posts on the internet have suggested that it could be a SVT due to AVNRT and should undergo investigation. However I have no symptoms whatsoever.
Hello there, thanks for the follow up questions. Like I said, you don't have any symptoms which is a very good sign. However, SVT can not be totally excluded like you have suggested. I would do an echocardiogram first to make sure structurally your heart is totally normal. Then it is your option to see an electrophysiologist (EP cardiologist) to discuss the possibility of SVT. Hope this will answer your question. Thanks again.
Having tried my heart rate monitor again, and looking more closely at the graphs, my resting pulse is about 60. During light activity it varies normally between 60-80 and goes down again. During exercise it increases to about 120 and but then sticks at this constant rate. Working more or less does not change the pulse at all. After stopping exercise it remains at 120 for about 20-30 mins of stopping before suddenly dropping back to 80. Does this sound like a SVT?