Moderate-to-Vigorous Intensity Physical Activity and Risk of Incident Atrial Fibrillation in Atrial Cardiomyopathy.

Authors

Min Kim, Pil-Sung Yang, Ho-Gi Chung, Juntae Kim, Daehoon Kim, Han-Joon Bae, Moon-Hyun Kim, Boyoung Joung

Published in

JACC. Advances. Pages 102999. Jul 14, 2026. Epub Jul 14, 2026.

Abstract

Current guidelines recommend physical activity for atrial fibrillation (AF) prevention, yet its role in individuals with atrial cardiomyopathy (AtCM) remains unclear.
We investigated the association between accelerometer-measured moderate-to-vigorous intensity physical activity (MVPA) and incident AF according to AtCM status.
Among 10,003 UK Biobank participants, AtCM was identified via multimodal approach integrating cardiovascular magnetic resonance imaging and 12-lead electrocardiography. Multivariable adjusted Cox proportional hazards models assessed the association between 7-day accelerometer-measured MVPA and incident AF. An interaction term evaluated substrate-specific associations.
AtCM was identified in 4.5% of participants. Over a median follow-up of 3.2 years, AtCM was associated with an increased risk of AF (HR: 3.01; 95% CI: 1.69 to 5.37). AtCM status significantly modified the MVPA-AF association (P for interaction = 0.029). Without AtCM, MVPA showed marginal risk reduction (HR per 10-minute increase: 0.94; 95% CI: 0.87-1.01). Conversely, with AtCM, MVPA was strongly associated with a lower AF risk (HR per 10-minute increase: 0.76; 95% CI: 0.62-0.93). The absolute risk reduction was 2.82 AF events per 1,000 person-years for every 10-minute increase in MVPA in the AtCM group, significantly greater than without AtCM (difference: -2.66; 95% CI: -4.32 to -0.73; P = 0.011). Findings remained robust across comprehensive sensitivity analyses.
MVPA demonstrated a robust inverse association with incident AF risk, particularly in individuals with AtCM. Identifying subclinical atrial substrate may guide targeted physical activity recommendations, suggesting MVPA as a potent lifestyle intervention to attenuate the transition from subclinical remodeling to overt clinical arrhythmia.

PMID:
42663368
Bibliographic data and abstract were imported from PubMed on 28 Aug 2026.

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