Nagy L E, King J C
Am J Clin Nutr. 1984 Dec;40(6):1258-63. doi: 10.1093/ajcn/40.6.1258.
Rates of energy expenditure after a 750-kcal meal were determined by open circuit, indirect calorimetry for four women in late pregnancy (30 to 40 wk gestation), six women in early pregnancy (10 to 20 wk gestation), and six nonpregnant women. Preprandial resting metabolic rates, expressed in kcal min-1, were 22.5% higher (p less than 0.05) in the late pregnancy group compared to the early pregnancy, and 15.9% higher (p less than 0.05) in the early pregnancy compared to the nonpregnant women. No differences in preprandial energy expenditure rates were seen between groups when expressed as kcal kg-1 h-1. Rates of energy expenditure increased above preprandial levels in all groups by 15 min postprandially and remained significantly elevated for the next 175 min. The total increase in postprandial energy expenditure above preprandial levels did not differ significantly due to stage of gestation. Respiratory quotient, the ratio of VCO2:VO2, increased significantly in all groups (p less than 0.05) above preprandial levels by 15 min after the meal. Respiratory quotient values began decreasing after 95 min and returned, in all groups, to preprandial levels by 175 min. The results from this study demonstrate that the increase in the rates of energy expenditure after a mixed meal was not altered by gestation.
通过开路间接量热法测定了750千卡餐后的能量消耗率，研究对象包括4名孕晚期（妊娠30至40周）女性、6名孕早期（妊娠10至20周）女性和6名非孕女性。以千卡每分钟表示的餐前静息代谢率，孕晚期组比孕早期组高22.5%（p<0.05），孕早期组比非孕女性高15.9%（p<0.05）。以千卡每千克每小时表示时，各研究组间的餐前能量消耗率未见差异。餐后15分钟时，所有组的能量消耗率均高于餐前水平，并在随后的175分钟内持续显著升高。餐后能量消耗相对于餐前水平的总增加量，未因妊娠阶段不同而有显著差异。呼吸商（VCO2:VO2的比值）在餐后15分钟时，所有组均显著高于餐前水平（p<0.05）。呼吸商值在95分钟后开始下降，所有组在175分钟时均恢复到餐前水平。本研究结果表明，混合餐后能量消耗率的增加不受妊娠影响。
