Figure 3. The effect of F_IO2 on the phase I, phase II and overall PCr amplitudes.

The amplitude of the initial phase I fall of PCr (A₁), expressed as a fraction of resting PCr, was not different as F_IO2 was increased. A slow component of PCr was present at F_IO2 of 0.1 and 0.21 (A₂). The overall fall in PCr, both A₁ and A₂, increased significantly as F_IO2 was decreased.