Click on image to view larger version.

Figure 3 Exercise tolerance. Serial changes in maximal exercise duration (min) on the Bruce exercise protocol and peak rate-pressure product (product of heart rate and systolic blood pressure at point of peak exertion) after myocardial infarction are shown with respect to patients allocated to the open artery group (open circles; n = 26) and to the closed artery group (open squares; n = 27).