Response by Smyth et al to Letters Regarding Article, 'Physical Activity and Anger or Emotional Upset as Triggers of Acute Myocardial Infarction: The INTERHEART Study'

We thank Culic for his comments on our recent publication,1 but we wish to make 2 comments. First, we would like to clarify the assessment methods of physical exertion. Participants were asked about physical exertion in 2 ways: as a potential triggering event in the hour before acute myocardial infarction (AMI) and in the same hour on the previous day, and the usual level of physical activity. Therefore, we must clarify that we do not know whether mild to mderate physicial activity preceded AMI; instead we know that 24.6% of …