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[The effect of the amplitude and frequency of blood pulsations on the peripheral vascular tonus].

In acute experiments on cats, hindlimbs' skeletal muscles, small intestine, a lung's lobe or a kidney were perfused. The mean value of the perfusion pressure was constant. The increase in frequency of the perfusion pressure oscillations from 0.75 to 10 Hz, at a constant amplitude, entailed a weak increase in the resistance to blood flow in skeletal muscles. The increase in amplitude of the oscillations from 30-40 to 100-120 mm Hg induced an obvious vasodilation. Intestinal vessels revealed a biphasic shift in the resistance to blood flow whereas no changes occurred in lungs. The dynamic mechanical deformation of the blood vessels' walls seems to exert a different effect upon the circulation in different areas.