[Resistance, exchange and capacitance vessels of the skeletal musculature in acute hypoxic hypoxia].

In cats under conditions of autoperfusion of hemodynamically isolated m. gastrocnemius, acute hypoxia (10% O2 in nitrogen) increased the precapillary and decreased the postcapillary resistance, reduced the capillary hydrostatic pressure and induced shifts of the capillary filtration coefficient (CFC) by 30% on the average. In cross-circulation performed for analysis of the neurogenic component in the vascular responses, analogous changes of the above parameters were revealed, the CFC decreasing, however. In denervated vascular bed of the m. gastrocnemius, the acute hypoxia decreased the precapillary and increased the postcapillary resistance, the hydrostatic pressure and the CFC increasing. In decentralized vessels of skeletal muscle, hypoxia induced prevalence of filtration while absorption of fluid prevailed in perfusion of the preparation with donor's arterial blood and in recipient's hypoxia.