we examined the relation between reported regular strenuous exercise or hard physical labor and the incidence of coronary heart disease ( chd ) death and nonfatal myocardial infarction among 1,533 hypercholesterolemic men aged 35-59 years who were in the placebo group of the lipid research clinics coronary primary prevention trial .
C0018787
heart
C0027051
myocardial infarction