Department of Psychology, University of Florida, Gainesville, Florida.
Department of Pediatrics, University of Florida, Gainesville, Florida.
Dev Psychobiol. 2019 Dec;61(8):1204-1213. doi: 10.1002/dev.21858. Epub 2019 Apr 19.
This study examined the main and interactive effects of maternal perceived stress and infant temperament-surgency, negative affectivity, and orienting/regulation-on infant salivary alpha-amylase (sAA) responses to stress. Saliva samples were collected prior to and following two naturalistic stressors: maternal separation conducted at 9 months and blood draw/immunizations conducted at 12 months. sAA area under the curve (AUC) was computed to determine response of the sympathetic nervous system to each stressor. Results revealed significant interactions of maternal stress and infant negative affectivity and orienting/regulation with sAA AUC. Relations between maternal stress and infant sAA AUC were stronger among infants with higher levels of negative affectivity and lower levels of orienting/regulation. These results highlight the need to examine both infant characteristics and environmental factors when investigating the development of stress response systems.
本研究考察了母亲感知压力以及婴儿气质（冲动性、负向情绪和定向/调节）对婴儿唾液α-淀粉酶（sAA）对应激反应的主要影响和交互影响。在两个自然应激源之前和之后采集了唾液样本：9 个月时的母亲分离和 12 个月时的采血/免疫接种。计算 sAA 面积下的曲线（AUC）以确定交感神经系统对每个应激源的反应。结果显示，母亲压力和婴儿负向情绪以及定向/调节与 sAA AUC 的显著交互作用。在负向情绪水平较高和定向/调节水平较低的婴儿中，母亲压力与婴儿 sAA AUC 之间的关系更强。这些结果强调，在研究应激反应系统的发展时，需要同时检查婴儿特征和环境因素。
