abstract: The articles tackles influence of blood type serological markers on development of psychic function of logical thinking of young athletes aged 17-20.Athletes (male) of teen age (n=132) took part in the research.Based on classification of kinds of sports by A. H. Dembo, they were divided into two groups: group A -speed-and-power kinds of sports (n=69); group B -endurance kinds of sports (n=63).Control group included students aged 17-20 (n=131) who did not do any sport.Analysis of the function of 
journal: Journal of Physical Education and Sport