Liu Cindy H, Fink Günther, Brentani Helena, Brentani Alexandra
Commonwealth Research Center, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts.
Swiss Tropical and Public Health Institute, Basel, Switzerland.
Dev Psychobiol. 2017 Nov;59(7):916-926. doi: 10.1002/dev.21557. Epub 2017 Aug 23.
This study examined maternal-infant synchrony of hair cortisol at 12 months after birth and the intra-individual stability of maternal hair cortisol in the postpartum period. Participants were selected from an ongoing São Paulo birth cohort project, where families are considered to be "high-risk" due to their chronic stress experiences, with the majority living in slums (favelas). Cortisol was collected through 3-cm segments of hair samples, with values representing approximate levels of cortisol from 9 to 12 months for mothers and children and 6 to 12 months for mothers. Maternal and infant cortisol values reflecting chronic stress 9-12 months after birth were highly correlated (r = .61, p < .001); earlier maternal cortisol levels (6-9 months) and child cortisol levels at 9-12 months (r = .51, p < .001) were also correlated. Maternal cortisol values showed stability over time (r = .79, p < .001). These maternal-infant correlations are high compared to the existing literature on hair cortisol in other mother-child dyads, suggesting stronger synchrony under high-risk contexts where families are faced with challenging circumstances.
本研究考察了出生后12个月时母婴头发皮质醇的同步性以及产后母亲头发皮质醇的个体内稳定性。研究对象选自圣保罗一个正在进行的出生队列项目，由于这些家庭有慢性应激经历，被视为“高危”家庭，其中大多数生活在贫民窟（棚户区）。通过采集3厘米长的头发样本获取皮质醇，其数值代表母亲和孩子9至12个月以及母亲6至12个月的皮质醇大致水平。反映出生后9至12个月慢性应激的母婴皮质醇值高度相关（r = 0.61，p < 0.001）；早期母亲皮质醇水平（6至9个月）与孩子9至12个月的皮质醇水平也相关（r = 0.51，p < 0.001）。母亲的皮质醇值随时间表现出稳定性（r = 0.79，p < 0.001）。与其他母婴二元组中关于头发皮质醇的现有文献相比，这些母婴相关性较高，表明在家庭面临挑战性环境的高危背景下存在更强的同步性。
