Cited by 303Cardiovascular Effects of ExerciseCardiac electrophysiology and arrhythmiasAtrial Fibrillation Management and Outcomes

Atrial Fibrillation Promotion by Endurance Exercise

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Guasch, Eduard, Benito, Begoña, Qi, Xiaoyan, Cifelli, Carlo, Naud, Patrice, Shi, Yanfen, Mighiu, Alexandra, Tardif, Jean-Claude +8 more·2013·Journal of the American College of Cardiology

Abstract

Objectives The goal of this study was to assess mechanisms underlying atrial fibrillation (AF) promotion by exercise training in an animal model.Background High-level exercise training promotes AF, but the underlying mechanisms are unclear.Methods AF susceptibility was assessed by programmed stimulation in rats after 8 (Ex8) and 16 (Ex16) weeks of daily 1-h treadmill training, along with 4 and 8 weeks after exercise cessation and time-matched sedentary (Sed) controls. Structural remodeling was evaluated by using serial echocardiography and histopathology, autonomic nervous system with pharmacological tools, acetylcholine-regulated potassium current (IKACh) with patch clamp recording, messenger ribonucleic acid expression with quantitative polymerase chain reaction, and regulators of G protein-signaling (RGS) 4 function in knockout mice.Results AF inducibility increased after 16 weeks of training (e.g., AF >30 s in 64% of Ex16 rats vs 15% of Sed rats; p < 0.01) and rapidly returned to baseline levels with detraining. Atropine restored sinus rhythm in 5 of 5 Ex rats with AF sustained >15 min. Atrial dilation and fibrosis developed after 16 weeks of training and failed to fully recover with exercise cessation. Parasympathetic tone was increased in Ex16 rats and normalized within 4 weeks of detraining. Baroreflex heart rate responses to phenylephrine-induced blood pressure elevation and IKACh sensitivity to carbachol were enhanced in Ex16 rats, implicating both central and end-organ mechanisms in vagal enhancement. Ex rats showed unchanged cardiac adrenergic and cholinergic receptor and IKACh-subunit gene expression, but significant messenger ribonucleic acid downregulation of IKACh-inhibiting RGS proteins was present at 16 weeks. RGS4 knockout mice showed significantly enhanced sensitivity to AF induction in the presence of carbachol.Conclusions Chronic endurance exercise increased AF susceptibility in rats, with autonomic changes, atrial dilation, and fibrosis identified as potential mechanistic contributors. Vagal promotion is particularly important and occurs via augmented baroreflex responsiveness and increased cardiomyocyte sensitivity to cholinergic stimulation, possibly due to RGS protein downregulation.

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Crossref · 10.1016/j.jacc.2013.01.091

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Authors
Guasch, E., Benito, B., Qi, X., Cifelli, C., Naud, P., Shi, Y., Mighiu, A., Tardif, J.-C., Tadevosyan, A., Chen, Y., Gillis, M.-A., Iwasaki, Y.-K., Dobrev, D., Mont, L., Heximer, S., & Nattel, S.
Affiliations
  • Montreal Heart Institute (CA)
  • University of Toronto (CA)
  • University of Duisburg-Essen (DE)
Corresponding author
Nattel, Stanley
Venue
Journal of the American College of Cardiology
Publisher
Elsevier BV
Published
2013-07
Volume
62
Issue
1
Pages
68-77
ISSN
0735-1097 (ISSN-L)
OpenAlex
W199998949
Cited by
302
References
33
Citations by year
2026: 16 · 2025: 15 · 2024: 26 · 2023: 25 · 2022: 16 · 2021: 29 · 2020: 28 · 2019: 20 · 2018: 31 · 2017: 18 · 2016: 24 · 2015: 23 · 2014: 19 · 2013: 11
FWCI
17.53
Type
journal article
Language
en
Open access
Locations
  • Journal of the American College of Cardiology (publishedVersion)
  • PubMed (publishedVersion)
  • Universitätsbibliographie, Universität Duisburg-Essen (submittedVersion)
Funders
  • Canadian Institutes of Health Research (MGP-6957, MOP44365, MOP106670)
  • Quebec Heart and Stroke Foundation
  • Fondation Leducq
  • Deutsche Forschungsgemeinschaft
  • Spanish Health Ministry (CM08/00201, CM06/00189)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Effects of Exercise
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Atrial Fibrillation Management and Outcomes
Keywords
atrial fibrillation, endurance exercise, exercise training, atrial remodeling, atrial dilatation, atrial fibrosis, parasympathetic activity, vagal tone, baroreflex, RGS4, atrial fibrillation risk, detraining, atrial electrophysiology
MeSH terms
Animals, Atrial Fibrillation, Disease Models, Animal, Exercise Test, Mice, Inbred C57BL, Physical Conditioning, Animal, Physical Endurance, Random Allocation, Rats, Wistar, Mice, Knockout, Mice, Rats

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