Cited by 92Cardiovascular Effects of ExerciseAtrial Fibrillation Management and OutcomesCardiovascular and Diving-Related Complications

Long-Term Incidence of Atrial Fibrillation and Stroke Among Cross-Country Skiers: Cohort Study of Endurance-Trained Male and Female Athletes

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Svedberg, Niclas, Sundström, Johan, James, Stefan, Hållmarker, Ulf, Hambraeus, Kristina, Andersen, Kasper·2019·Circulation

Abstract

BACKGROUND: Studies have revealed a higher incidence of atrial fibrillation among well-trained athletes. We aim to investigate associations of endurance training with incidence of atrial fibrillation and stroke and to establish potential sex differences of such associations in a cohort of endurance trained athletes. METHODS: All Swedish skiers (208 654) completing 1 or more races in the 30 to 90 km cross-country skiing event Vasaloppet (1989-2011) and a matched sample (n=527 448) of nonskiers were followed until first event of atrial fibrillation or stroke. Cox regression was used to investigate associations of number of completed races and finishing time with incidence of atrial fibrillation and stroke. RESULTS: Female skiers in Vasaloppet had a lower incidence of atrial fibrillation than did female nonskiers (hazard ratio [HR], 0.55; 95% CI, 0.48-0.64), independent of finishing time and number of races. Male skiers had a similar incidence to that of nonskiers (HR, 0.98; 95% CI, 0.93-1.03). Skiers with the highest number of races or fastest finishing times had the highest incidence. Skiers of either sex had a lower incidence of stroke than did nonskiers (HR, 0.64; 95% CI, 0.60-0.67), independent of the number of races and finishing time. Skiers with atrial fibrillation had higher incidence of stroke than did skiers and nonskiers without atrial fibrillation (men: HR, 2.28; 95% CI, 1.93-2.70; women: HR, 3.51; 95% CI, 2.17-5.68; skiers with atrial fibrillation vs. skiers without atrial fibrillation). After diagnosis of atrial fibrillation, skiers with atrial fibrillation had a lower incidence of stroke (HR, 0.73; 95% CI, 0.50-0.91) and lower mortality compared with nonskiers with atrial fibrillation (HR, 0.57; 95% CI, 0.49-0.65). CONCLUSIONS: Female skiers in Vasaloppet had lower incidence of atrial fibrillation and stroke. Male skiers had similar incidence of atrial fibrillation and lower risk of stroke. Men with higher number of races and faster finishing times had the highest incidence of atrial fibrillation. After diagnosis of atrial fibrillation, skiers had lower incidence of stroke and death than did nonskiers with atrial fibrillation. This indicates that although on an individual level atrial fibrillation in well-trained individuals is associated with higher incidence of stroke, on population level, risk of stroke is low and that exercise should not be avoided.

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Crossref · 10.1161/circulationaha.118.039461

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  • In general, the risk of atrial fibrillation in female athletes appears to be lower than in male athletes.

    “In general, risk of AF in female athletes appears to be lower than in male athletes.29 38”
  • Although the prevalence of AF increases with age, the relative risk for athletes compared to nonathletes is higher in younger athletes.

    “Moreover, although the prevalence of AF increases with age, the relative risk for athletes compared to nonathletes seems to be higher in younger athletes [22,23].”

    From Atrial Fibrillation in Elite Athletes: A Comprehensive Review of the Literature (2024) · cites this paper as [23]

    The Discussion says earlier reports found age important to AF development in male athletes, but it does not say whether younger athletes have a higher relative risk than older athletes compared with nonathletes. The Results compare skiers with nonskiers by sex, not by age; searches for younger skiers and age-dependent relative risk found no age-stratified comparison in our copy. (LLM, conf=0.72)

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  • Preliminary evidence suggests that the risk of atrial fibrillation-associated events such as stroke or mortality might be lower in athletes than in the general population.

    “preliminary evidence suggests that the risk of AF-associated events (e.g.stroke, mortality) might be lower in athletes than in the general population.43,44”

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Authors
Svedberg, N., Sundström, J., James, S., Hållmarker, U., Hambraeus, K., & Andersen, K.
Affiliations
  • Uppsala University (SE)
  • Department of Medical Sciences, Uppsala University, Sweden (N..S., J.S., S.J., U.H., K.H., K.A.).
Venue
Circulation
Published
2019-09-10
Volume
140
Issue
11
Pages
910-920
ISSN
  • 0009-7322 (ISSN-L)
  • 1524-4539
OpenAlex
W2972491210
Cited by
92
References
42
Citations by year
2026: 16 · 2025: 13 · 2024: 16 · 2023: 13 · 2022: 9 · 2021: 13 · 2020: 11
FWCI
5.97
Type
journal article
Language
en
Open access
Locations
  • Circulation (publishedVersion)
  • PubMed (publishedVersion)
Funders
Regionala Forskningsrådet Uppsala/Örebro
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Effects of Exercise
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Atrial Fibrillation Management and Outcomes
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Cardiovascular and Diving-Related Complications
Keywords
atrial fibrillation, stroke, cross-country skiing, endurance training, athletes, sex differences, Vasaloppet, finishing time, stroke mortality, long-term incidence, cardiovascular hospitalization, cardiovascular risk factors, cardiovascular risk reduction, cardiovascular risk prevention, cardiovascular risk screening
MeSH terms
Adult, Atrial Fibrillation, Female, Follow-Up Studies, Humans, Longitudinal Studies, Male, Middle Aged, Physical Endurance, Risk Factors, Skiing, Sweden, Time Factors, Cohort Studies, Incidence, Stroke, Athletes

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