The role of hormonesin thermogenesis of the newborn is not known. Eight premature newborns (aged 12–72 hours and weighing 1080–2200 gr), who were admitted with rectal temperature ranging from 30.1–34.1°C (mean 32.8) were studied. Serum T4 iodine, GH.,I.,and blood glucose (BG) were determined during hypothermia (stage A) and when body temperature had been normal for at least 24 hours (stage B). The serum T4 values were significantly lower in stage A (1.8±55 mcg/100 ml), than in stage B (4.58±2 mcg/100 ml) with p <0.05. Serum I. values were also lower in stage A (13.57±6.7 μU/ml) than in stage B (21.4±4.9 μU/ml) with p <0.05, without analogous changes in BG concentration. GH concentration was not significantly different in stage A (23.7±9.4 ng/ml) than in stage B (16.5±5.1 ng/ml). The low levels of thyroxine may suggest a stage of decompesation or an inability to increase thyroid function appropriately upon exposure to cold.
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机译：激素在新生儿产热中的作用尚不清楚。研究了八名早产新生儿（年龄在12–72小时之间，体重1080–2200 gr），他们的直肠温度为30.1–34.1°C（平均32.8）。在体温过低（A期）和体温正常至少24小时（B期）时测定血清T4碘，GH，I。和血糖（BG）。在A期（1.8±55 mcg / 100 ml），血清T4值显着低于B期（4.58±2 mcg / 100 ml），p <0.05。血清I.值在A期（13.57±6.7μU/ ml）也低于B期（21.4±4.9μU/ ml），p <0.05，而BG浓度无类似变化。 GH浓度在A阶段（23.7±9.4 ng / ml）与B阶段（16.5±5.1 ng / ml）无显着差异。甲状腺素水平低可能表明处于失代偿期或在暴露于寒冷时无法适当增加甲状腺功能。
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