PDF(Pubmed)
Abstract：
The purposes of this pilot study were to describe changes in breastmilk lipid content in response to an acute bout of moderate intensity exercise and to explore maternal metabolic health factors, including metabolic flexibility, which may impact this change. A cross-sectional, observational, pilot study design was performed in 14 women between 4 and 6 months postpartum. Whole body fasting lipid oxidation was assessed, a standardized high-fat breakfast was consumed, and lipid oxidation was again measured 120-minutes post-meal. Metabolic flexibility was determined by comparing the change in lipid oxidation before and after the meal. Women completed 30-minutes of moderate intensity treadmill walking 150-minutes post-meal. Breastmilk was expressed and analyzed for lipid content before and after exercise. Overall, there was no significant difference between pre- and post-exercise breastmilk lipid content (pre-exercise 59.4±36.1 g/L vs. post-exercise 52.5±20.7 g/L, p=0.26). However, five (36%) women had an increase in breastmilk lipid content in response to the exercise bout, compared to nine (64%) that had a decrease in breastmilk lipid content suggesting inter-individual variability. The change in breastmilk lipid content from pre- to post-exercise was positively correlated to metabolic flexibility (r=0.595, p=0.03). Additionally, post-exercise lipid content was positively correlated with body mass index (BMI), body composition, and postpartum weight retention. Preliminary findings from this pilot study suggest that metabolic flexibility and maternal weight status may help explain the inter-individual changes in breastmilk lipid content in response to an acute bout of moderate intensity exercise.
摘要：
这项初步研究的目的是描述响应于中等强度运动的急性发作的母乳脂质含量的变化，并探讨母体代谢健康因素。包括新陈代谢的灵活性，这可能会影响这一变化。横截面，观察,在产后4至6个月的14名女性中进行了初步研究设计.评估全身空腹脂质氧化，吃了标准化的高脂肪早餐，餐后120分钟再次测量脂质氧化。通过比较餐前和餐后脂质氧化的变化来确定代谢灵活性。妇女在餐后150分钟完成了30分钟的中等强度跑步机步行。在运动前后表达并分析母乳的脂质含量。总的来说,运动前和运动后母乳脂质含量之间没有显着差异（运动前59.4±36.1g/L与运动后52.5±20.7g/L，p=0.26）。然而,五名（36％）的女性因运动而增加了母乳脂质含量，相比之下，9例（64％）母乳脂质含量降低，表明个体间差异。运动前后母乳脂质含量的变化与代谢灵活性呈正相关（r=0.595，p=0.03）。此外,运动后血脂含量与体重指数(BMI)呈正相关,身体成分,和产后体重保留。这项初步研究的初步结果表明，代谢灵活性和母体体重状态可能有助于解释因中等强度运动的急性发作而引起的母乳脂质含量的个体间变化。
