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Figure 1


Fig. 1. Changes in arterial PO2 (A) and O2 content (B) as a function of time into apnea. Points in A and B are individual blood samples from five seals (see Table 2 for labels of individual seals). (A) Equation for exponential rate of PO2 decline: y=58e(–x/2.32)+765e(–x/0.10) +21.8 (r2=0.93, N=82). (B) Equation for linear depletion of O2 content: y=–2.34x+27.2 (r2=0.68, N=82, P<0.0001).