Coexistence of Vigorous Exercise and Heavy Smoking in Triggering Acute Myocardial Infarction in Men Under 35 Years - Fact or Fiction?

We would like to put forward the following questions: What is the rate of myocardial infarction (MI) occurring during or immediately after severe physical exercise (these may also be called exercise MIs or ex. MIs). Do these ex. MIs show particular characteristics? Would these MIs have been predictable and if so could they have been avoided?