June 28, 2026Journal of the American College of Cardiology
Impact of CARDIOrespiratory FITness on Arrhythmia Recurrence in Obese Individuals With Atrial Fibrillation
Key result
High baseline fitness or gaining ≥2 METs is linked to greater arrhythmia-free survival in obese AF.
- P<0.001
- n=308
Why the study?
Although cardiorespiratory fitness protects against incident AF in obese individuals, its effect on AF recurrence and the benefit of cardiorespiratory fitness gain were unknown.
Does high cardiorespiratory fitness or fitness improvement reduce arrhythmia recurrence in obese individuals with atrial fibrillation?
Population
308 obese patients (BMI ≥27 kg/m2) with AF
Comparison
Cardiorespiratory fitness levels (high vs adequate vs low) and fitness gain (≥2 METs vs <2 METs)
Design
Cohort study
Authors
Discussion
Loading...
Member takes
Key expert perspectives
Captured external expert commentary on this paper, strongest first. Original sources are linked where available.
“What's most exciting about this new study is that it is the first to demonstrate that increasing exercise capacity reduces atrial fibrillation risk. These new results, and the cumulative data linking moderate physical activity to reduced atrial fibrillation risk, suggest that until definitive trial data are available, clinicians should recommend moderate exercise training to our patients with atrial fibrillation, not only to reduce atrial fibrillation, but also for its overall cardiovascular benefits.”
“While weight loss is important for heart disease patients, especially those with arrhythmia, our study shows it's beneficial to have high cardiorespiratory fitness and continue to improve on that. An ideal treatment plan would include a focus on both.”
“These findings highlight the prescriptive role of exercise in managing patients with AF, particularly as a strategy for rhythm control.”
Implication
Fitness gains ≥2 METs were associated with lower AF recurrence in obese patients; hypothesis-generating for exercise integration into rhythm control.
Key Points
- This study aims to assess how cardiorespiratory fitness affects arrhythmia recurrence in obese individuals with atrial fibrillation.
- Analyzed 308 obese patients with atrial fibrillation participating in a tailored exercise program.
- Used exercise stress testing to categorize cardiorespiratory fitness into low, adequate, and high levels.
- Monitored atrial fibrillation recurrence through Holter monitoring and questionnaires.
- High cardiorespiratory fitness was linked to significantly better arrhythmia-free survival (p < 0.001).
- Patients with a cardiorespiratory fitness gain of ≥2 METs experienced reduced AF burden and symptom severity (p < 0.001).
- Arrhythmia-free survival was also higher in those achieving ≥2 METs gain compared to <2 METs gain (p < 0.001).
Study Design
Type
Cohort (n=308)
Structured PICO
Does high cardiorespiratory fitness or fitness improvement reduce arrhythmia recurrence in obese individuals with atrial fibrillation?
P
Population
308 obese patients (BMI ≥27 kg/m2) with atrial fibrillation who participated in a tailored exercise program.
E
Exposure
High cardiorespiratory fitness (>100%) or objective gain in fitness (≥2 METs) via a tailored exercise program
C
Comparator
Low (<85%) or adequate (86% to 100%) cardiorespiratory fitness, or fitness gain <2 METs
O
Outcome
Arrhythmia-free survival with and without rhythm control strategieshard clinical
Main Result
p-value: p=<0.001
Cite This Study
Pathak et al. (2015) conducted a cohort in Atrial Fibrillation in Obese Individuals (n=308). High cardiorespiratory fitness and fitness gain ≥2 METs vs. Low/adequate fitness and fitness gain <2 METs was evaluated on Arrhythmia-free survival (p=<0.001). High baseline cardiorespiratory fitness and a fitness gain of ≥2 METs were associated with significantly greater arrhythmia-free survival in obese patients with atrial fibrillation (p<0.001).