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Figure 3 Ischemic thresholds of ex 1 and 2 at the 2 ex sessions. Subjects received intravenous saline at one session and intravenous aminophylline at the other session. See Figure 1 and text for definition of the ischemic threshold. *Aminophylline at ex 1 versus saline at ex 1, p = 0.016. ex = exercise.