| Abstract: | Effects of a voluntary single quick shin contraction on quantitative parameters of the venous outflow in the femoral vein and postcava were investigated in 65 normal males and females with the Doppler ultrasonic and duplex blood pool scanning techniques. Measured were linear spontaneous blood flow, mean linear and peak velocites of the transport of blood after the muscle contraction, baseline linear cross sections of the femoral vein and postcava cross section, and their extension in the course of mobilized blood evacuation. Based on these measurements calculated were weight power space velocities of the spontaneous blood flow and volumes of mobilized venous blood The investigations were made in supine and standing subjects. According to our data, hemodynamic productivity of the muscle contraction in vertical subjects was much higher than in horizontal with the peak and mean linear blood evacuation outrunning the mean spontaneous outflow from the femoral vein in 25.7 and 10.3 times, respectively. Besides, the weight power space velocity of the contraction-induced outflow exceeded that of the spontaneous blood flow 12.5 times. Simultaneous contraction of the muscles on both legs increased four times the weight power space velocity in the subdiaphragmatic part of the postcava. |
