Abstract
To determine which warming system more closely approximates a neutral thermal environment, the O2 consumption of 16 premature babies, weighing less than 1500 g each, was measured in a convectively heated incubator and under an open radiant warmer. Both systems were controlled to maintain a skin temperature of 36.degree. C. The O2 consumption of the infants was significantly higher under the radiant warmer. This result is in agreement with published data for this group of premature infants.

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