Abstract

The blood and plasma viscosity, hematocrit and coagulation parameters were examined before and after training in well trained adolescent swimmers and adult weigth-lifters, with volunteers (medical students) as a control group. The blood viscosity of the adolescent swimmers before training was lower than in the other two groups, as a result of lower hematocrit values. When the viscosity was calculated on the basis of a hematocrit number of 45 it was found that the blood viscosity of the non-trained volunteers and the majority of the sportsmen was increased by the training. Therefore, the blood viscositychanges of some sportsmen were interesting: as a result of training, the viscosity did not increase, but remained at the starting level or even decreased.These changes show a good correlation with the sport result of the active sportsmen in this period. Verf.-Referat