Elevated Creatine Kinase MB Isoenzyme Levels in Marathon Runners

Abstract
Elevated serum creatine kinase MB isoenzyme (CK-MB) levels are regarded as a sensitive and specific marker for myocardial injury. Serum CK-MB was measured in male marathon runners during training and after competition. Mean serum CK-MB measured by a quantitative electrophoretic technique (normal, JAMA1981;246:2049-2051)