Does high intensity interval training increase the risk of atrial fibrillation (AF) or does it mitigate the AF burden in patients with non permanent AF or both?
An article from Brazil with a 3 year followup suggest that HIIT increases the risk of AF and increases atrial size when compared with moderate exercise in hypertensive patients with chronic renal failure (1). But what about normotensive folks with no renal disease?
A short term trial (2) from Norway comparing HIIT with no exercise in patients with non permanent AF demonstrated less AF burden in the HIIT group.
1)Kiuchi,MG The effects of different activities on atrial fibrillation in patients with hypertension and renal failure. Kidney Research and Clnical Practice. 2017, spet 36 (3) 264
2)Malmo, Aerobic interval training reduces the burden of atrial fibrillation in the short term Circ 2016,133 466-473