Maintenance Energy Costs of Pregnancy

Because of the increase in tissue mass, the body's oxygen consumption also increases during pregnancy. Estimates suggest that the increase in oxygen consumption is equivalent to an extra 187 (45), 414 (100), 620 (148), and 951 (230) kJ/day (kcal) at 0-10, 10-20, 20-30, and 30-40 weeks of gestation, respectively. The total maintenance cost for an average human pregnancy is approximately 150 MJ (35 800 kcal) (Table 2).

Table 2 Increases in oxygen consumption during pregnancya ml/min

Table 2 Increases in oxygen consumption during pregnancya ml/min

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