One big difference between running in persistent atrial fibrillation and normal sinus rhythm is that, for me anyway, there is a lot of apprehension about over-doing it. The days of charging up a hill may be behind me at this point, and I haven’t done anything resembling a speed work-out in well over a year.
Prior to atrial fibrillation I used to do interval work-outs once in a while. For certain marathons where I had a specific personal time goal I would do a work-out known as “Yasso 800s.” Although some expert dispute that this is actually the most effective speed work-out for marathon training, nobody would dispute that this is a difficult work-out. I would do them on Wednesday nights at a local college track and I always felt they were my most difficult work-out of the week – probably more challenging than my languorous week-end long runs. Certainly this was the work-out where most feared injury.
To be honest I don’t miss Yasso 800s. I never have been a fast runner and never enjoyed short fast races like 5Ks.
But even during LSD (long slow distance) work-outs there usually comes a point where I will feel that the run is becoming difficult and I have to push through that. People often say “push through the pain,” but it isn’t really “pain” per se; but whatever it is it now makes me nervous!
But now that I am in persistent atrial fibrillation I think twice about pushing beyond any thresholds, however they are described. I have a fear in the back of my mind that I am going to make the atrial fibrillation worse, or pass out, or die, or . . . well who knows? This is all new territory for me.
I think this is why I “bonked out” of the second and third (out of seven planned) twenty mile runs I did during my build-up to this Sunday’s Bizz Johnson 50K. I just wasn’t willing to risk it. But if I’m unwilling to risk it it is obvious that I will only get slower and slower each year.
I’d love to hear from other endurance athletes about this topic whether you are in a fib or not, and whether you are risk averse or not. Please feel free to leave a comment.