Intensity of physical exertion and triggering of myocardial infarction: a case-crossover study
Key result
Strenuous physical exertion (METs ≥ 6) was strongly associated with acute myocardial infarction symptom onset within 2 hours compared to very light or no exertion (RR 5.7; 95% CI 3.6-9.0).
Why the study?
Does physical exertion trigger acute myocardial infarction symptom onset in an exposure-response manner?
Population
1,301 patients with acute myocardial infarction from the Myocardial Infarction Registry in Augsburg, Germany
Comparison
Physical exertion, including indoor vs outdoor… vs Very light or no exertion
Design
Case-control
Authors
Discussion
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Implication
Graded exertion intensity raises AMI trigger risk, especially outdoors; extends prior case-crossover data but leaves clinical guidance unchanged.
Study Design
Type
Case-Control (n=1,301)
Structured PICO
Does physical exertion trigger acute myocardial infarction symptom onset in an exposure-response manner?
P
Population
1,301 patients with acute myocardial infarction from a registry in Augsburg, Germany, reporting activity levels on the day of AMI and three preceding days.
E
Exposure
Physical exertion (strenuous [METs ≥ 6] or moderate [METs = 5]), including indoor vs outdoor settings
C
Comparator
Very light or no exertion (case-crossover self-control periods)
O
Outcome
Acute myocardial infarction symptom onset within 2 hourshard clinical
Main Result
Relative Risk: 5.7 (95% CI 3.6–9)
There is a graded exposure-response relationship between the intensity of physical exertion and the triggering of acute myocardial infarction onset, with higher risk for outdoor exertion.
Cite This Study
Klot et al. (2008) conducted a case-control in Acute myocardial infarction (AMI) (n=1,301). Strenuous physical exertion (METs ≥ 6) vs. Very light or no exertion was evaluated on AMI symptom onset within 2 hours (RR 5.7, 95% CI 3.6-9.0). Strenuous physical exertion (METs ≥ 6) was strongly associated with acute myocardial infarction symptom onset within 2 hours compared to very light or no exertion (RR 5.7; 95% CI 3.6-9.0).