Purpose of this paper is to assess whether atrial fibrillation (AF) in heart failure (HF) affects oxygen uptake at anaerobic threshold (O2 AT). The Authors oserved that in HF patients with AF, despite a similar peak O2 compared with patients with HF and sinusal rithm, O2AT is higher because of a higher heart rate, and a greater HR increase during exercise.
One postulated mechanism would be that a greater cardiac output increases at the beginning of exercise in HF patients with AF. The delayed AT generates uncertainty about the meaning of a O2 value at AT in HF patients with AF, because a higher AT is usually associated with better performance and a better prognosis.
Palermo P, Magrì D, Sciomer S, Stefanini E, Agalbato C, Compagnino E, Chircu CM, Maffessanti F, Teodoru M, Agostoni P. Delayed Anaerobic Threshold in Heart Failure Patients With Atrial Fibrillation. J Cardiopulm Rehabil Prev 2016;36(3):174-9. Go to PubMed