Fig. 1
From: Contribution of nitric oxide to cerebral blood flow regulation under hypoxia in rats
Experimental protocol of hypoxia a without LNA (experiment A) and b hypoxia with LNA (experiment B). The experiment was carried out approximately 3 h after the preparation of rats. The evoked CBF and field potential were measured under normoxia, hypoxia without LNA, and hypoxia with LNA. In each examination, 20 successive stimuli (5 Hz and 5 s) were applied at 60 s intervals. The animals were ventilated with a 30% O2 and 70% N2 mixture during normoxia (control). To avoid a change in arterial blood pressure, the O2 concentration was gradually decreased in a stepwise manner from 30 to 22.5 and 15% during hypoxia