[Rheological blood indicators during motor activity of various degrees].

Blood rheological parameters of essentially healthy people were examined during exercises of a maximal workload and 14-day head-down tilt. The results obtained indicate that in the people performing normal and increased motor activity some rheological parameters were different. Changes in the rheological parameters of blood after head-down tilt and exercises with a maximal workload suggest the existence of a blood viscosity threshold above which physical work capacity declines significantly. The capacity can be restored through a correction of blood viscosity in the recovery period. The basic rheological properties of blood can be improved by regular physical training.