Absence of Atrial Contraction and Exercise in Patients with Isolated Atrial Fibrillation

The aim of the study was to assess the effect of absence of atrial contraction during exercise. During the incremental ergometer exercise tests, heart rate, oxygen uptake, and oxygen pulse in patients with isolated atrial fibrillation were compared with those in control subjects at rest, at the exercise level of gas exchange anaerobic threshold, and at peak exercise. The study population consisted of 51 subjects aged 40 years or more: 12 patients with isolated atrial fibrillation and 39 control subjects with normal sinus rhythm. Heart rate in control subjects was lower than that in patients with isolated atrial fibrillation, at rest, anaerobic threshold, and peak exercise (74± 12 vs 85±8 beats/min at rest, 108± 16 vs 134± 18 beats/min at anaerobic threshold, and 151 ±16 vs 173±22 beats/min at peak exercise, all p