[Hemodynamics and oxygen balance during isometric muscle tetany under conditions of hypoxic hypoxia].

Arterial pressure, venous outflow from the isolated m. gastrocnemius, and oxigenation of arterial and muscular venous blood during and after the 7-sec contraction elicited by electrical stimulation of peripheral end of cut sciatic nerve (24/sec), were studied in anesthetized cats. Hypoxia was induced by artificial ventilation of lungs with 7% oxygen in nitrogen. The data obtained showed a conformity of levels of O2 consumption to the levels of blood flow and a closer connection of O2 consumption with the flow than with oxygen extraction from the blood. Dynamics of the flow recovery seems to correspond to the metabolic theory while the growing of hyperemia confirms the ideas of the hystomechanical hypothesis.