It's not clear to me what relevance this has for humans.
Life long runners, like me, have 3-4 times the rate of A-Fib compared to non-runners.
Yet, most of us have no other cardio-pathology.
But, one thing did catch my attention in this article.
I had A-Fib symptoms in my early teens. USA doctors are very skeptical when they hear that.
It will be interesting to see if the requisite physiology for A-Fib is present in human children.
Runners are usually on a high carb diet. Could have some relation.