Аннотация:30 skilled sportsmen, and 15 not training persons were examined by the method of bioimpedance analysis of the body composition. Analysis of the main parameters of the sportsmen body composition is given. The data of fatty mass, active cellular mass, lean mass differ from the same parameters of not training persons. The most variable age factor of the sportsmen body composition is the fatty mass. The influence of the methodical error the bioimpedance analysis on the body composition parameters was studied.