Figure 1.

Growth curves demonstrating the effects of exposure to hypoxic (HY) conditions postpartum on rats. Rats exposed to 12% O₂ (HY12) for 20 days exhibited successful catch‐up growth relative to normoxic rats raised in room air (RA). The animals exposed to 10% O₂ (Hy10) for 10 days had more dramatic reductions in early growth and failed to attain full growth relative to the other groups. At 65 days of age, rats exposed to 12% O₂ postpartum did not differ in body mass from the RA animals. The HY10 rats were significantly smaller. Data points are means ± SE. N = 6–18 for various groups. (*P < 0.05 vs. RA, #P < 0.05 vs. HY12).