Detection of the State of Thrombotic Readiness in Rats under One-Time Suprathreshold Physical Activity of Various Durations by Means of Thromboelastography

Suprathreshold physical activity causing distress in the organism can lead to the damage of various organs and systems including the hemostatic system. A modern integrated method of the hemostatic system assessment is thromboelastography. The purpose of the present study was to evaluate the state of the hemostatic system under one-time suprathreshold physical activity of various durations by means of thromboelastography. Experimental groups of rats were exposed to 4-hour and 8-hour physical activities in the form of forced running on a moving platform with the speed of 6-8 m/min. Immediately after the one-time physical activity, blood samples taken from rats were examined using the thrombelastograph in the Natem mode for 35 minutes. The 4-hour physical activity caused a reduction in coagulation time (CT) and an increase in the alpha angle and the maximum clot firmness (MCF). After the 8-hour activity, the thrombelastograph registered a reduction in coagulation time (CT), an increase in the alpha angle, a decrease in the clot formation time (CFT), a decrease in the maximum clot firmness (MCF), and a reduction in the maximum clot lysis (ML). The 4-hour physical activity resulted in partial activation ofthe hemostatic system without changing the fibrinolytic activity of blood plasm. The changes revealed in thromboelastography parameters indicate a high risk of the development of thrombotic readiness. The 8-hour physical activity causes a shift of the hemostatic system parameters in rats towards the increased clot formation: hypercoagulation, fibrinogen and platelet consumption, inhibition of fibrinolysis. The combination of changes in thromboelastogram parameters is indicative of the development of thrombotic readiness.