[The evaluation of energy balance in pregnancy]

Energy balance assessment of 317 pregnant women in Sofia was conducted. Energy intake and energy expenditure during the first and the third trimester, gestational weight gain and prepregnancy body mass index have been studied. The regression analysis revealed a significant correlation between neonate body mass and energy expenditure level, but the decreased metabolic constants of physical activity, suggested an influence of increased basal metabolic rate, corresponding to the gestational body mass gain.