Karra M V, Kirksey A
Department of Foods and Nutrition, Purdue University, West Lafayette, Indiana 47907.
J Pediatr Gastroenterol Nutr. 1988 Jan-Feb;7(1):100-6. doi: 10.1097/00005176-198801000-00019.
Longitudinal changes in nutrient levels of human milk have been observed with the progression of lactation, but less is known about changes at different feedings during a 24-h period. In this study, calcium, magnesium, and zinc levels were examined in milk obtained from 49 women at every breast feeding during one 24-h period each month for the first 6 months of lactation. Magnesium and zinc concentrations showed significant diurnal variation at each stage of lactation examined, whereas calcium levels were relatively constant. Maximum variations of 7.5, 17, and 48% were observed within a 24-h period in mean levels of calcium, magnesium, and zinc, respectively. Irrespective of variability, zinc and magnesium concentrations in a single milk sample obtained between 10:00 a.m. and 2:00 p.m. were highly correlated with the mean value of samples collected at each feeding during a 24-h period.
随着哺乳期的推进，人们观察到母乳中营养成分的纵向变化，但对于24小时内不同喂奶时段的变化情况了解较少。在本研究中，对49名女性在哺乳期前6个月每月的一个24小时时段内每次母乳喂养时采集的乳汁中的钙、镁和锌水平进行了检测。在所检测的哺乳期各阶段，镁和锌的浓度均呈现出显著的昼夜变化，而钙水平相对稳定。在24小时内，钙、镁和锌的平均水平分别出现了7.5%、17%和48%的最大变化。无论存在何种变异性，上午10点至下午2点之间采集的单个乳汁样本中的锌和镁浓度与24小时内每次喂奶时采集的样本平均值高度相关。
