The results from Type 2 diabetic BBZ rat hearts in this study demonstrate (a) increased activities of polyol pathway enzymes aldose reductase and sorbitol dehydrogenase with duration of diabetes, (b) increased ischemic injury and poor functional recovery after ischemia-reperfusion, (c) reduced ischemic injury and improved functional recovery consequent to inhibition of aldose reductase or sorbitol dehydrogenase. This evidence concerns the gene SORD and diabetes mellitus.