Our expert says:
The answer very simply is no! Impossible. Sinus arrhythmia is a normal condition in healthy young people. All it means is that your heart speeds up as you breathe in, and slows down as you breathe out: a normal phenomenon, not an abnormal condition!
It sounds as though your exhaustion has got nothing to do with your heart, but if you are really worried about your heart, see a cardiologist and get a full assessment. If the cardiologist confirms that your heart is normal, then you can be perfectly sure it will not stop suddenly, for example when you go to gym. Normal healthy hearts can tolerate as much exercise as you can impose on them, so for people with normal hearts there is no such thing as “too much exercise”. It sounds very much as though anxiety is a part of your problem.
Kind regards and best wishes, JT
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