The administration of polymers into the vascular bed of the m. gastrocnemius and in vitro did not affect the postocclusion hyperemia but in changed the venous outflow from the muscle, the change having a phasic character. The effects of concentrations and molecular mass of the polymers on the blood rheological properties were more obvious in vitro. Dextran-20 thousand most favourably affects the blood viscosity whereas the least favourable one belongs to polyoxyethylene-20 thousand. The polymers with molecular mass about 500 thousand in small concentrations reduce the viscosity of the blood, in larger concentrations they enhance it increasing the erythrocytes aggregation.
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