Yoneyama K, Goto I, Nagata H
Nara University of Education.
Nihon Koshu Eisei Zasshi. 1995 Jul;42(7):472-81.
The total protein, lipid, lactose and calcium concentrations in breast milk were measured monthly from 1 month to 8-12 months postpartum in 26 lactating women. In order to determine whether changes in the milk composition were due to changes in the duration of lactation or the decline in the milk yield, or both, a linear regression analysis of the change rate of the milk composition against that of the milk volume was performed for the period from 5 to 12 months in 12 women for whom milk yield per day was measured in addition to the milk composition. Protein concentration decreased by about 30% during the first 6 months. Thereafter it increased significantly when the decrease in the milk yield was rapid but declined significantly when the decrease in the milk yield was gradual. The lactose concentration did not change during the first 10 months but somewhat increased thereafter. The calcium concentration remained steady during the 5 months but decreased significantly thereafter. The rate of change for calcium was not affected by the extent of decline in milk yield. No significant changes were observed in lipid concentration and calculated energy content during the 12 months of lactation.
对26名哺乳期妇女产后1个月至8 - 12个月期间的母乳进行每月一次的总蛋白、脂质、乳糖和钙浓度测量。为了确定母乳成分的变化是由于哺乳期时长的改变、母乳产量的下降，还是两者兼而有之，对12名除测量母乳成分外还测量了每日母乳产量的妇女在5至12个月期间进行了母乳成分变化率与母乳量变化率的线性回归分析。蛋白质浓度在最初6个月下降了约30%。此后，当母乳产量快速下降时，蛋白质浓度显著上升；而当母乳产量逐渐下降时，蛋白质浓度则显著下降。乳糖浓度在最初10个月没有变化，但此后有所增加。钙浓度在5个月内保持稳定，但此后显著下降。钙的变化率不受母乳产量下降程度的影响。在哺乳期的12个月内，脂质浓度和计算得出的能量含量未观察到显著变化。
