For an estimated 10.55 million U.S. adults living with atrial fibrillation (AFib), a new analysis in the Journal of the American Heart Association delivers a practical message. Even low levels of physical activity, the kind that fits into an ordinary day, were tied to a meaningfully lower risk of stroke and death.
The observational study tracked 87,340 adults from two long-running Norwegian health surveys, HUNT and Tromsø, for around 15 years. Compared with inactive adults, those reporting a low level of activity had a 9 percent lower risk of stroke and an 11 percent lower risk of death from any cause. Moderate activity was linked to a 19 percent lower stroke risk and 18 percent lower mortality. High activity was tied to an 18 percent lower stroke risk and a 22 percent lower risk of death.
More than 6,500 of the participants had AFib. Those who stayed active lived, on average, 0.5 to 1.2 years longer than their inactive peers with the condition.
Why this matters for AFib patients
AFib is a quivering or irregular heartbeat in the upper chambers of the heart that can allow blood clots to form and travel to the brain. The condition affects roughly 4.48 percent of the U.S. adult population, according to the American Heart Association's 2026 Heart Disease and Stroke Statistics.
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Many people with AFib move less than the general population, often because of fatigue, palpitations or fear of triggering symptoms. That makes the study's low-effort finding particularly useful. Kristoffer Johansen, Ph.D., of the School of Sport Sciences at UiT The Arctic University of Norway and lead author of the study, said in the press release that "regular physical activity is important for all and could be an important preventive strategy for people with AFib."
Johansen added that he hopes the results raise awareness among clinicians and patients that benefits show up early. "Real health benefits can happen no matter when a person starts getting active, and even a little exercise is better than nothing," he said.
How the study was designed
Participants were on average 51 years old at enrollment, and 47 percent were men. They self-reported how often, how long and how hard they exercised, and researchers grouped them into inactive, low, moderate and high activity categories. Because this is an observational study, it can show associations, not prove that exercise itself caused the lower risks. People who move more may also eat differently, sleep better or have fewer other conditions.
Cleveland Clinic cardiologist Mina Chung, M.D., who co-chaired the 2023 U.S. atrial fibrillation guideline, put that caveat plainly. "It's important to remember that physical activity may also reflect overall health. Still, the results motivate patients to be as active as they can. Even lower levels of activity were associated with benefit, while moderate to high levels were linked to greater benefit," Chung said in the press release.
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What the guidelines already say
For patients able to do more, current U.S. guidance is more ambitious. The 2023 ACC/AHA/ACCP/HRS AFib guideline recommends moderate-to-vigorous exercise training with a target of 210 minutes per week, alongside weight loss, blood pressure control, alcohol moderation and smoking cessation, to reduce the burden of arrhythmia.
The new Norwegian data suggest that patients who cannot hit that target still stand to gain. A short daily walk, some light housework or gentle cycling appears to be a reasonable starting point.
Anyone with AFib who wants to become more active, or who notices new palpitations, chest discomfort or shortness of breath during exercise, should talk with their cardiologist before making changes, particularly if they take anticoagulants or rate-control medication.
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