Myocardial remodeling is well-known to be both an adaptive option under certain conditions of life (sports, pregnancy, etc.), and the result of cardiovascular pathology. The study of the features of cardiac remodeling includes the involvement of cardiomyocytes in the process by the level of troponins, creatine phosphokinase, and its cardiac isoform as markers of ischemia and necrosis. Also, neurohormonal rearrangement is evaluated using a natriuretic peptide, and endothelial dysfunction is determined using a C–reactive protein. The level of matrix metalloproteinases (MMP) and their tissue inhibitors (TIMP) reflects the degree of the proteolytic activity and collagen fibers’ degradation. However, there are no clear biochemical markers of “adaptive heart” and pathological changes in different age periods, in the climatic environment, various types and severity of sports loads, especially when evaluating matrix metalloproteinases and their tissue inhibitors. The primary task in determining the criteria for pathological remodeling of the myocardium becomes the definition of normative indicators.The aim of the study was to determine the reference values of the main biochemical markers of cardiac remodeling in healthy adolescents living in the Far North. The levels of troponin I, creatine phosphokinase-MV, aspartate aminotransferase did not exceed the generally accepted standard values. There were correlations between lactate dehydrogenase, aspartate aminotransferase, and mass-growth indicators of adolescents. Markers of extracellular matrix degradation (MMP-9, TIMP-1 and TIMP-4, MMP-9/ TIMP-1) differed from the data available in the published studies, which is probably due to the influence of tissue hypoxia associated with the climatic living conditions and the age in children of the study group.