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Reactive Hyperemia. Reactive hyperemia is the transient increase in organ blood flow that occurs following a brief period of ischemia (e.g., arterial occlusion).hen the occlusion is released, blood flow rapidly increases (i.e., hyperemia occurs) that lasts for several minutes. The hyperemia occurs because during the period of occlusion, tissue hypoxia and a build up of vasodilator metabolites (e.g., adenosine) dilate arterioles and decrease vascular resistance.
Postprandial or reactive hyperglycemia occurs after eating (postprandial means after eating). During this type of hyperglycemia, your liver doesn't stop sugar production, as it normally would directly after a meal, and stores glucose as glycogen (energy sugar stores). If your postprandial (1-2 hours after eating) blood glucose level is above 180mg/dL, that's postprandial or reactive hyperglycemia.