Cited by 1,021Cardiovascular Effects of ExercisePhysical Activity and HealthCardiac electrophysiology and arrhythmias

Triggering of Sudden Death from Cardiac Causes by Vigorous Exertion

Open access
Albert, Christine M., Mittleman, Murray A., Chae, Claudia U., Lee, I.-Min, Hennekens, Charles H., Manson, JoAnn E.·2000·New England Journal of Medicine

Abstract

BACKGROUND: Retrospective and cross-sectional data suggest that vigorous exertion can trigger cardiac arrest or sudden death and that habitual exercise may diminish this risk. However, the role of physical activity in precipitating or preventing sudden death has not been assessed prospectively in a large number of subjects. METHODS: We used a prospective, nested case-crossover design within the Physicians' Health Study to compare the risk of sudden death during and up to 30 minutes after an episode of vigorous exertion with that during periods of lighter exertion or none. We then evaluated whether habitual vigorous exercise modified the risk of sudden death that was associated with vigorous exertion. In addition, the relation of vigorous exercise to the overall risk of sudden death and nonsudden death from coronary heart disease was assessed. RESULTS: During 12 years of follow-up, 122 sudden deaths were confirmed among the 21,481 male physicians who were initially free of self-reported cardiovascular disease and who provided information on their habitual level of exercise at base line. The relative risk of-sudden death during and up to 30 minutes after vigorous exertion was 16.9 (95 percent confidence interval, 10.5 to 27.0; P<0.001). However, the absolute risk of sudden death during any particular episode of vigorous exertion was extremely low (1 sudden death per 1.51 million episodes of exertion). Habitual vigorous exercise attenuated the relative risk of sudden death that was associated with an episode of vigorous exertion (P value for trend=0.006). The base-line level of exercise was not associated with the overall risk of subsequent sudden death. CONCLUSIONS: These prospective data from a study of U.S. male physicians suggest that habitual vigorous exercise diminishes the risk of sudden death during vigorous exertion.

Integrity signals

Registry

Crossref · 10.1056/nejm200011093431902

Cites

47 of 47 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

3 of 11 cited sources checked · 3 supported · 0 flagged

  • Findingown data

    The relative risk of sudden death during and up to 30 minutes after vigorous exertion was 16.9 (95% CI, 10.5 to 27.0; P<0.001).

    “The relative risk of sudden death during and up to 30 minutes after vigorous exertion was 16.9 (95 percent confidence interval, 10.5 to 27.0; P<0.001).”
    • Also stated in: § RESULTS · plain
      “the relative risk of sudden death during the one-hour period associated with vigorous exertion (Fig. 1), as compared with other time points, was significantly elevated at 16.9 (95 percent confidence interval, 10.5 to 27.0; P<0.001).”
    Quote in the paperSubstantial claim
    • The authors state this as an assumption: Each episode of exertion was associated with 60 minutes of exposure time.
  • Findingown data

    Men who rarely engaged in vigorous exercise (less than once a week) had a relative risk of sudden death of 74.1 during and 30 minutes after exertion.

    “Men who rarely engaged in vigorous exercise (less than once a week) had a relative risk of sudden death of 74.1 in the period during and 30 minutes after exertion.”
    Quote in the paperSubstantial claim
    • The authors state this as an assumption: Each episode of exertion was associated with 60 minutes of exposure time.
  • Findingown data

    The relative risk associated with an acute episode of vigorous exertion was not significantly modified by the time of death.

    “The relative risk associated with an acute episode of vigorous exertion was not significantly modified by the time of death.”
    Quote in the paperSubstantial claim
  • Findingown data

    Among men who exercised at least five times per week, the risk of sudden death during and after vigorous exertion remained significantly higher than during periods of lighter exertion or none.

    “In comparison, men who exercised at least five times per week had a much lower risk (relative risk, 10.9); however, this risk was still significantly higher than that during periods of lighter exertion or none.”
    Quote in the paperSubstantial claim
    • The authors state this as an assumption: Each episode of exertion was associated with 60 minutes of exposure time.
  • Findingown data

    The risk of nonsudden death from coronary heart disease was lower among men who participated in vigorous exercise than among those who did not.

    “In contrast, the risk of nonsudden death from coronary heart disease was lower among the men who participated in vigorous exercise than among those who did not.”
    Quote in the paperNot a substantial claim
  • May combine two claims. 5
  • Classified as probably not a substantial claim. 6
  • May combine two claims.

    Interpretationcitation

    These results are similar to those reported for nonfatal myocardial infarction and corroborate those previously reported in a population-based, retrospective case-control study of victims of cardiac arrest.

    “These results are similar to those reported for nonfatal myocardial infarction 17,25 and corroborate those previously reported in a population-based, retrospective casecontrol study of victims of cardiac arrest.11”
    Quote in the paperNot a substantial claim2 of 3 sources checked
    • cites [17] source
    • cites [25] source
    • cites [11] source
    • The authors state this as an assumption: Each episode of exertion was associated with 60 minutes of exposure time.
  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation

    Moderate physical activity is associated with a markedly reduced risk of coronary events and cardiac arrest.

    “Moderate physical activity is associated with a markedly reduced risk of coronary events 32,36 and cardiac arrest, 37 and therefore it might also protect against sudden death.”
    Quote in the paperSubstantial claim1 of 3 sources checked
    • cites [32] source
    • cites [36] source
    • cites [37] source
  • May combine two claims.

    Findingown data

    The relative risk associated with vigorous exertion remained significantly elevated at times other than the circadian peak in sudden death, except for the period from midnight to 6 a.m., when exposure to exertion was low.

    “In addition, the relative risk associated with vigorous exertion remained significantly elevated at times other than the circadian peak in sudden death, except for the period from midnight to 6 a.m., when exposure to exertion was low.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingnone given

    The 23 sudden deaths associated with vigorous exertion in this study make up one of the largest series to date.

    “although the number is still quite small, the 23 sudden deaths that were associated with vigorous exertion in this study make up one of the largest series to date.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductnone given

    Two cardiologists reviewed medical records and next-of-kin reports for all subjects who died from cardiac causes and reached agreement on whether the death was sudden.

    “To identify sudden deaths, medical records and reports from the next of kin for all subjects who had died from cardiac causes were reviewed again by two cardiologists, and agreement was reached on whether the death was sudden.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Premisecitation

    The case-crossover study design permits the assessment of change in the risk of an event during a brief hazard period during and after exposure to a transient risk factor.

    “The casecrossover study design permits the assessment of change in the risk of an event during a brief”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [13] Maclure M, 1991, Am J Epidemiol source
  • May combine two claims.

    Study design and conductown data

    The rarity of exertion-related sudden death limits the statistical power of the study and tends to produce unstable estimates of risk.

    “Third, the rarity of exertion-related sudden death limits the statistical power of the study and tends to produce unstable estimates of risk.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductown data

    The relative risks of sudden death and nonsudden death from coronary heart disease for the base population were computed with Cox proportional-hazards models with simultaneous control for potential confounders.

    “the relative risks of sudden death and nonsudden death from coronary heart disease for the base population of 21,481 men were computed with use of Cox proportional-hazards models 23 with simultaneous control for potential confounders.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [23] Cox DR, 1972, J R Stat Soc [B] source
  • Classified as probably not a substantial claim.

    Study design and conductnone given

    An end-points committee of physicians confirmed all events by review of medical records.

    “An end-points committee of physicians confirmed all events by review of medical records.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Habitual vigorous exertion increases basal vagal tone, resulting in increased cardiac electrical stability and in protection against ventricular fibrillation.

    “However, habitual vigorous exertion increases basal vagal tone, resulting in increased cardiac electrical stability and in protection against ventricular fibrillation.27”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [27] Hull SS, 1994, Circulation source
10 of 10
  • The authors state this as an assumption.

    Each episode of exertion was associated with 60 minutes of exposure time.

    “We therefore assumed that each episode of exertion was associated with 60 minutes of exposure time.”
1 of 1

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The cardiovascular risks associated with exercise lessen as individuals become more physically active/fit.

    “In addition, there is considerable evidence that exercise is safe for most people and has many associated health and fitness benefits; exercise-related cardiovascular events are often preceded by warning signs/symptoms; and the cardiovascular risks associated with exercise lessen as individuals become more physically active/fit.”

    From Updating ACSM's Recommendations for Exercise Preparticipation Health Screening (2015) · cites this paper as [1]

    The Results table reports that the relative risk of sudden death during or shortly after vigorous exertion was lower among men who exercised vigorously more often. This supports the claim's direction, but the study measured habitual exercise rather than fitness and examined sudden death in male physicians, not exercise-related cardiovascular risks generally. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Vigorous-intensity physical activity transiently increases the risk of nonfatal acute myocardial infarction and sudden cardiac death approximately sixfold to 17-fold as compared with resting behavior.

    “Retrospective and prospective data suggest that vigorous-intensity physical activity transiently increases the risk of nonfatal AMI and SCD approximately sixfold (31) to 17-fold (1) as compared with resting behavior.”

    From Updating ACSM's Recommendations for Exercise Preparticipation Health Screening (2015) · cites this paper as [1]

    The Results report a 16.9-fold increase in sudden cardiac death risk during or shortly after vigorous exertion, supporting the approximately 17-fold figure attributed to this paper. The comparator was periods of lighter exertion or none, not resting behavior alone. The sixfold nonfatal-AMI figure is attached to a different citation. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Some evidence suggests that diabetes mellitus and renal disease may be associated with exercise-related sudden cardiac death and acute myocardial infarction.

    “Nonetheless, some evidence suggests that diabetes mellitus and renal disease may be associated with exercise-related SCD and AMI (1,31), and specific recommendations for individuals with these comorbid conditions are incorporated into the new procedures.”

    From Updating ACSM's Recommendations for Exercise Preparticipation Health Screening (2015) · cites this paper as [1]

    Table 1 reports that diabetes was more common among men who died suddenly than among those who did not, supporting an association with sudden cardiac death in this cohort. It does not establish that diabetes was associated specifically with exercise-related deaths. The indexed copy does not report a renal-disease association or link either condition to exercise-related acute myocardial infarction. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • In the Physician's Health Study, exercise substantially increased the relative risk of sudden cardiac death.

    “In the Physician's Health Study, exercise substantially increased the relative risk of sudden cardiac death, 91”

    From Managing with pacemakers and implantable cardioverter defibrillators (2013) · cites this paper as [91]

    The Abstract reports a 16.9-fold relative risk of sudden cardiac death during and up to 30 minutes after vigorous exertion, compared with lighter or no exertion. The claim omits this short-term, vigorous-exertion condition: the Abstract also says habitual exercise was not associated with an increased overall risk of subsequent sudden death. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • In virtually all studies, habitual physical activity was inversely related to the likelihood of sudden cardiac death and/or acute myocardial infarction occurring during or immediately after vigorous-intensity exercise.

    “Moreover, in virtually all studies, habitual physical activity was inversely related to the likelihood of SCD and/or AMI occurring during or immediately after vigorous-intensity exercise (1,12,31,39).”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Absolute risk is confused with excess risk

    Minor

    The abstract reports 1 sudden death per 1.51 million episodes as the absolute risk. The results instead give the absolute risk as 1 per 1.42 million episodes and identify 1 per 1.51 million as the excess risk compared with lighter activity or none.

1 of 1

Cites

Flagged first, then by citations

Research works printed but not linked: 2

  1. Rothman KJ, Greenland S. Modern epidemiology. 2nd ed. Philadelphia: Lippincott–Raven, 1998:253-79.
  2. Chae CU, 1997, Circulation, 96, I

Cited by

Sorted by citations

Authors
Albert, C. M., Mittleman, M. A., Chae, C. U., Lee, I.-M., Hennekens, C. H., & Manson, J. E.
Affiliations
  • Brigham and Women's Hospital (US)
  • Beth Israel Deaconess Medical Center (US)
  • University of Miami (US)
Venue
New England Journal of Medicine
Published
2000-11-09
Volume
343
Issue
19
Pages
1355-1361
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2319521698
Cited by
1,020
References
44
Citations by year
2026: 8 · 2025: 27 · 2024: 32 · 2023: 36 · 2022: 42 · 2021: 37 · 2020: 45 · 2019: 41 · 2018: 47 · 2017: 61 · 2016: 51 · 2015: 78 · 2014: 43 · 2013: 43 · 2012: 41
FWCI
14.56
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (HL-34595, R01HL034595, K08HL003783)
  • National Cancer Institute (R01CA040360, CA 40360)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Effects of Exercise
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
Keywords
sudden cardiac death, physical activity, habitual exercise, cardiac arrest, coronary heart disease mortality, male physicians, exercise intensity, risk factor control
MeSH terms
Adult, Aged, Aged, 80 and over, Coronary Disease, Physical Exertion, Humans, Male, Middle Aged, Prospective Studies, Risk, Risk Factors, Exercise, Proportional Hazards Models, Case-Control Studies, Death, Sudden, Cardiac

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