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. 2005 Jun 23;567(Pt 2):689–699. doi: 10.1113/jphysiol.2005.091462

Figure 4. Effects of intermittent hypoxia on cerebral tissue oxygenation.

Figure 4

A, the effects of intermittent hypoxia on the ratio of the fall in cerebral tissue oxygen saturation to the fall in arterial oxyhemoglobin saturation (ΔScO2/ΔSaO2) during progressive hypoxia for both SDIH and LDIH subjects (cerebral tissue oxygen saturation sensitivity). The box indicates the period of the intermittent hypoxia intervention. Data points are means ± s.e.m.*Significantly different from day 1 (P > 0.001). B, the absolute change in ScO2 on days 1 and 12 at iso-SaO2 (83 ± 3%) for each subject in SDIH. All but one subject showed a greater reduction in ScO2 at day 12. C, the absolute change in ScO2 on days 1 and 12 at iso-SaO2 (83 ± 3%) for each subject in LDIH. Five of nine subjects show a greater reduction in ScO2 at day 12. The large open circle data points represent the group mean (for both B and C).