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Related Experiment Videos

Does heavy physical exertion trigger myocardial infarction? A case-crossover analysis nested in a population-based

J Hallqvist1, J Möller, A Ahlbom

  • 1Department of Public Health Sciences, Karolinska Institute, Sundbyberg, Sweden.

American Journal of Epidemiology
|March 9, 2000
PubMed
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Heavy physical exertion significantly increases the risk of acute myocardial infarction (heart attack). This risk is influenced by an individual's physical fitness and socioeconomic status.

Area of Science:

  • Cardiology
  • Epidemiology
  • Public Health

Background:

  • Acute myocardial infarction (heart attack) is a leading cause of mortality worldwide.
  • The role of physical exertion as a potential trigger for cardiac events requires further investigation.

Purpose of the Study:

  • To investigate the association between heavy physical exertion and the triggering of first-time acute myocardial infarction events.
  • To explore potential modifying factors such as physical fitness and socioeconomic status on this association.

Main Methods:

  • A population-based case-crossover study was conducted in Stockholm County, Sweden (1993-1994).
  • Interviews were conducted with 699 patients diagnosed with myocardial infarction.
  • Various analytical techniques were employed to mitigate bias, including case-referent and pair-matched analyses.

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Main Results:

  • Vigorous physical exertion was associated with a 6.1-fold increased relative risk of acute myocardial infarction.
  • The risk was notably higher among sedentary individuals, suggesting a U-shaped association with physical fitness.
  • Socioeconomic status was also identified as a modifying factor for the trigger effect of exertion.

Conclusions:

  • Heavy physical exertion can act as an acute trigger for first-time myocardial infarction.
  • Physical fitness and socioeconomic status play a role in modulating this risk.
  • Methodological considerations are crucial to address potential biases like reverse causation and misclassification.