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Peak forearm blood flow (FBFpeak) after ischaemia. Data are mean±s.e.mean. (a) placebo versus dipyridamole and (b) caffeine versus caffeine/dipyridamole. P-value indicates level of significance for the effect of dipyridamole on peak FBF after ischaemia (a and b) and the interaction between caffeine and dipyridamole (a versus b, ANOVA for repeated measures).
