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Figure 1 The ischemic threshold and the adjusted maximum (max) ST segment depression in exercises 1 and 2 of the scintigraphic study (substudy A). The ischemic threshold is the heart rate-systolic blood pressure product x 10^–3 at the appearance of 1 mm ST segment depression. Adjusted max ST depression is the maximum ST segment depression corresponding to the highest heart rate-systolic blood pressure product common to both exercises. Exercise 1 is the baseline exercise electrocardiogram Tl-201 test, which was used in the analysis, and exercise 2 is the warmed-up Tl-201 test of the third exercise session. Tl-201 = thallium-201.