Wenckebach and Marathon training

Medical Q&A [Moderated]
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6 weeks out for a marathon but had a consult with my cardiologist who advised me against doing it (and cutting back my training).

Initially screening was done to figure out high BP reasons which is now under control with meds. Doctor has identified fibrosis (suspected from myocarditis at some point - due to positioning) but also Wenckebach (I cannot remember if it’s type 2a or b).

Due to both factors, I’m told I should never essentially run any marathons due to both of these two issues. However, half is fine. I also need to cut back my training volume due to the scarring.

This was a major blowing hearing this news, I’m very competitive and the last 8 months or so have been 6+ days of running in preparation, but obviously want to be safe and do the smart thing.

My question is, are arrhythmias common in athletes? Is it a definite no go to exercise at such a high threshold for that long in cases like this? (3-3.5 hrs marathon). And can arrhythmias or fibrosis ever been reversed, or is that is for me in terms of endurance sport?

Also would love consult on this and understand what data I need to bring (MRI, Ultrasound, Holter monitor all available). I couldn’t see this consult option (medical) on the site.

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Shoot as an email at support@barbellmedicine.com and we can get you setup for a consultation.

To others reading this, there are many different types of arrhythmias. Some arrhythmias require emergent medical intervention and are an absolute contraindication to exercise, whereas others are mostly harmless, particularly when documented and monitored by medical professionals. Exercise is not a concern in those individuals.

Yes, some arrhythmias like atrial fibrillation and “SVT” (supraventricular tachycardia) are more common in highly-trained athletes than the general population.

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