Our expert says:
The question to be answered is whether your heart rhythm with strenuous exercise is really an exercise-induced arrhythmia ie an abnormal (pathological) heart rhythm, or simply a very high rate with a normal (physiological) rhythm.
The problem is that heart rate monitors quite often give falsely high heart rates, and your symptoms are not necessarily due to an arrhythmia.
The best way to sort this out is to have a stress ECG done by a cardiologist (preferably one who cycles or runs!) while wearing your heart rate monitor. Alternatively, you could wear an "ambulatory ECG machine" ("Holter") while cycling. These teats should enable the cardiologist to see exactly what kind of rhythm you have when you have the symptoms, and also to correlate the heart rates from the ECG machine with those you get from your heart rate monitor. He/she will then be able to tell you if you really have an "exercise-induced arrhythmia" or not.
It should not be necessary to wait till July to see a cardiologist! I would ask around in the area where you live and get an earlier appointment.
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