[Muscular exertion--"embarrassment" in the evaluation of aminotransferases and creatine kinase serum levels].

The authors draw attention to the problem of elevated values of aspartate aminotransferase (AST), alanine aminotransferase (ALT) and creatine kinase (CK) serum activities in adolescents which they encountered recently in two patients hospitalized in their clinic. In common practice it is important when evaluating results of ALT, AST and CK in serum to take into account the effect of physical load, encountered frequently in this age group of adolescents.