Michelle Bosquet Enlow

Maternal intimate partner violence and increased asthma incidence in children buffering effects of supportive caregiving.

OBJECTIVES To examine the relationship between maternal intimate partner violence (IPV) and asthma onset in children and the role of supportive caregiving factors in modifying this relationship. DESIGN Prospective birth cohort. SETTING In-person interview at enrollment as well as in-home interviews during study follow-up. PARTICIPANTS Children (N = 3116) enrolled in the Fragile Families and Child Wellbeing Study. Main Exposures Maternal report of IPV assessed after the childs birth and at 12 and 36 months. In addition, mothers indicated how many days a week they participated in activities with the child and the amount and type of educational/recreational toys available for the child. Main Outcome Measure Maternal report of physician-diagnosed asthma by age 36 months. RESULTS Asthma was diagnosed in 19% of children. In adjusted analysis, children of mothers experiencing IPV chronically, compared with those not exposed, had a 2-fold increased risk of developing asthma. In stratified analysis, children of mothers experiencing IPV and low levels of mother-child activities (relative risk, 2.7; 95% confidence interval, 1.6-4.7) had a significant increased risk for asthma. Those exposed to IPV and high levels of mother-child activities had a lower risk for asthma (relative risk, 1.6; 95% confidence interval, 0.9-3.2). A similar buffering effect was noted among children with high numbers of educational/recreational toys. CONCLUSIONS Intimate partner violence is associated with increased early childhood asthma risk. Maternal ability to maintain positive caregiving processes in this context may buffer the effects of violence on child asthma risk. The best way to promote positive health in toddlers may be to help their mothers.

Interpersonal trauma exposure and cognitive development in children to age 8 years: a longitudinal study

Background Childhood trauma exposure has been associated with deficits in cognitive functioning. The influence of timing of exposure on the magnitude and persistence of deficits is not well understood. The impact of exposure in early development has been especially under-investigated. This study examined the impact of interpersonal trauma exposure (IPT) in the first years of life on childhood cognitive functioning. Methods Children (N=206) participating in a longitudinal birth cohort study were assessed prospectively for exposure to IPT (physical or emotional abuse or neglect, sexual abuse, witnessing maternal partner violence) between birth and 64 months. Child intelligent quotient (IQ) scores were assessed at 24, 64 and 96 months of age. Race/ethnicity, gender, socioeconomic status, maternal IQ, birth complications, birth weight and cognitive stimulation in the home were also assessed. Results IPT was significantly associated with decreased cognitive scores at all time points, even after controlling for socio-demographic factors, maternal IQ, birth complications, birth weight and cognitive stimulation in the home. IPT in the first 2 years appeared to be especially detrimental. On average, compared with children not exposed to IPT in the first 2 years, exposed children scored one-half SD lower across cognitive assessments. Conclusion IPT in early life may have adverse effects on cognitive development. IPT during the first 2 years may have particular impact, with effects persisting at least into later childhood.

Mother–infant attachment and the intergenerational transmission of posttraumatic stress disorder

Evidence for the intergenerational transmission of posttraumatic stress disorder (PTSD) is documented in the literature, although the underlying mechanisms are poorly understood. Attachment theory provides a framework for elucidating the ways in which maternal PTSD may increase offspring PTSD vulnerability. The current study utilized two independent prospective data sets to test the hypotheses that (a) maternal PTSD increases the probability of developing an insecure mother-infant attachment relationship and (b) an insecure mother-infant attachment relationship increases the risk of developing PTSD following trauma exposure in later life. In the first study of urban, primarily low-income ethnic/racial minority mothers and infants (N = 45 dyads), elevated maternal PTSD symptoms at 6 months were associated with increased risk for an insecure, particularly disorganized, mother-infant attachment relationship at 13 months. In the second birth cohort of urban, low-income mothers and children (N = 96 dyads), insecure (avoidant or resistant) attachment in infancy was associated in a dose-response manner with increased lifetime risk for a diagnosis of PTSD by adolescence. A history of disorganized attachment in infancy predicted severity of PTSD symptoms, including reexperiencing, avoidance, hyperarousal, and total symptoms, at 17.5 years. In both studies, associations between attachment and PTSD were not attributable to numerous co-occurring risk factors. The findings suggest that promoting positive mother-child relationships in early development, particularly in populations at high risk for trauma exposure, may reduce the incidence of PTSD.

Associations of maternal lifetime trauma and perinatal traumatic stress symptoms with infant cardiorespiratory reactivity to psychological challenge

Objective: To examine associations of maternal lifetime trauma and related psychological symptoms in the perinatal period with infant cardiorespiratory reactivity and behavioral distress in response to a laboratory stressor, using a novel advanced system recently adapted for infants. Methods: Participants were mothers and their 6-month-old infants. Assessments included mothers’ self-reported lifetime exposure to trauma, perinatal traumatic stress, and current symptoms of posttraumatic stress disorder (PTSD) and depression. Through the use of a noninvasive respiratory inductance plethysmography device, heart rate and indices of respiratory volume, timing, and thoracoabdominal coordination were recorded continuously in 23 infants during the Still-Face Paradigm, a videotaped mother-infant dyadic assessment that included baseline, stressor, and recovery phases. Infant behavioral distress during the procedure was also assessed. Results: Infants of mothers with low exposure to trauma and perinatal traumatic stress showed expected increases in behavioral distress and cardiorespiratory activation from baseline to stressor and decreases in these parameters from stressor to recovery. Infants of mothers exposed to multiple traumas and with elevated perinatal traumatic stress showed similar patterns of activation from baseline to stressor but failed to show decreases during recovery. These patterns were maintained after controlling for current maternal PTSD and depressive symptoms. Conclusions: Maternal lifetime trauma exposure and traumatic stress during the perinatal period were associated with disrupted infant cardiorespiratory regulation and behavioral distress during a stressor protocol. These results support the concept of perinatal programming and its potential role in physical and mental health outcomes. PTSD = posttraumatic stress disorder; HPA = hypothalamic-pituitary-adrenal; ECG = electrocardiogram; SFP = Still-Face Paradigm; LSC-R = Life Stressor Checklist-Revised; EPDS = Edinburgh Postnatal Depression Scale; PCL-C = Posttraumatic Stress Disorder Checklist-Civilian Version; HR = heart rate; VT = tidal volume; V’min = minute ventilation; TI = inspiratory duration; TE = expiratory duration; TTOT = total breath duration; TI/TTOT = respiratory timing; %RC = percentage of rib cage contribution to tidal volume; PhRIB = inspiratory thoracoabdominal asynchrony; PhREB = expiratory thoracoabdominal asynchrony; QDC = Qualitative Diagnostic Calibration.

Racial/ethnic and sociodemographic factors associated with micronutrient intakes and inadequacies among pregnant women in an urban US population.

OBJECTIVE To assess sociodemographic correlates of micronutrient intakes from food and dietary supplements in an urban, ethnically diverse sample of pregnant women in the USA. DESIGN Cross-sectional analyses of data collected using a validated semi-quantitative FFQ. Associations between racial, ethnic and sociodemographic factors and micronutrient intakes were examined using logistic regression controlling for pre-pregnancy BMI, maternal age and smoking status. SETTING Prenatal clinics, Boston, MA, USA. SUBJECTS Analyses included pregnant women (n 274) in the PRogramming of Intergenerational Stress Mechanisms (PRISM) study, an urban longitudinal cohort designed to examine how stress influences respiratory health in children when controlling for other environmental exposures (chemical stressors, nutrition). RESULTS High frequencies of vitamin E (52 %), Mg (38 %), Fe (57 %) and vitamin D (77 %) inadequacies as well as suboptimal intakes of choline (95 %) and K (99 %) were observed. Factors associated with multiple antioxidant inadequacies included being Hispanic or African American, lower education and self-reported economic-related food insecurity. Hispanics had a higher prevalence of multiple methyl-nutrient inadequacies compared with African Americans; both had suboptimal betaine intakes and higher odds for vitamin B₆ and Fe inadequacies compared with Caucasians. Nearly all women (98 %) reported Na intakes above the tolerable upper limit; excessive intakes of Mg (35 %), folate (37 %) and niacin (38 %) were also observed. Women reporting excessive intakes of these nutrients were more likely Caucasian or Hispanic, more highly educated, US-born and did not report food insecurity. CONCLUSIONS Racial/ethnic and other sociodemographic factors should be considered when tailoring periconceptional dietary interventions for urban ethnic women in the USA.

Maternal sensitivity and infant autonomic and endocrine stress responses

BACKGROUND Early environmental exposures may help shape the development of the autonomic nervous system (ANS) and hypothalamic-pituitary-adrenal (HPA) axis, influencing vulnerability for health problems across the lifespan. Little is known about the role of maternal sensitivity in influencing the development of the ANS in early life. AIMS To examine associations among maternal sensitivity and infant behavioral distress and ANS and HPA axis reactivity to the Repeated Still-Face Paradigm (SFP-R), a dyadic stress task. STUDY DESIGN Observational repeated measures study. SUBJECTS Thirty-five urban, sociodemographically diverse mothers and their 6-month-old infants. OUTCOME MEASURES Changes in infant affective distress, heart rate, respiratory sinus arrhythmia (RSA), and T-wave amplitude (TWA) across episodes of the SFP-R were assessed. A measure of cortisol output (area under the curve) in the hour following cessation of the SFP-R was also obtained. RESULTS Greater maternal insensitivity was associated with greater infant sympathetic activation (TWA) during periods of stress and tended to be associated with greater cortisol output following the SFP-R. There was also evidence for greater affective distress and less parasympathetic activation (RSA) during the SFP-R among infants of predominantly insensitive mothers. CONCLUSIONS Caregiving quality in early life may influence the responsiveness of the sympathetic and parasympathetic branches of the ANS as well as the HPA axis. Consideration of the ANS and HPA axis systems together provides a fuller representation of adaptive versus maladaptive stress responses. The findings highlight the importance of supporting high quality caregiving in the early years of life, which is likely to promote later health.

Maternal stress and perinatal programming in the expression of atopy

Biological hypersensitivity to environmental stimuli, a fundamental feature of atopy, contributes to a spectrum of costly pediatric disorders, including allergic rhinitis, atopic dermatitis and asthma. The increase in the prevalence of these disorders and the enormous costs involved in managing atopic patients have motivated efforts to identify early risk factors that may be amenable to intervention and prevention [1–3].

Childhood abuse is associated with increased hair cortisol levels among urban pregnant women

Background Hypothalamic–pituitary–adrenal (HPA) axis activity is known to be altered following events such as childhood abuse. However, despite potential adverse consequences for the offspring of women who have experienced abuse, very little is known about altered HPA axis activity during pregnancy. Methods During pregnancy, 180 women from diverse racial/ethnic backgrounds reported on their exposure to emotional, physical and/or sexual abuse before the age of 11, and general post-traumatic stress symptoms (ie, not limited to childhood years or abuse experiences). Around delivery, they provided hair samples for the assessment of cortisol levels during pregnancy. Hair cortisol was assessed for each pregnancy trimester. The effect of childhood abuse on hair cortisol was assessed using mixed-effects analyses of covariance models allowing for within-subject correlated observations, and were first performed in the entire sample and subsequently stratified by race/ethnicity. Results Controlling for post-traumatic stress symptoms, hair cortisol levels varied by history of child abuse, F(2,166)=3.66, p=0.028. Childhood physical and/or sexual abuse was associated with greater hair cortisol levels, t(166)=2.65, p=0.009, compared with no history of abuse. Because childhood rates of abuse and hair cortisol levels varied by race/ethnicity, analyses were stratified by race/ethnicity. The associations between history of abuse and cortisol levels were only significant among black women, F(2,23)=5.37, p=0.012. Conclusions Childhood abuse, especially physical and/or sexual abuse, is associated with differences in cortisol production during pregnancy, particularly among black women. Future research should investigate how these differences impact physical and mental health outcomes among offspring of affected women.

Lifetime exposure to traumatic and other stressful life events and hair cortisol in a multi-racial/ethnic sample of pregnant women

Abstract We examined whether lifetime exposure to stressful and traumatic events alters hypothalamic-pituitary-adrenal (HPA) axis functioning, as indexed by hair cortisol, regardless of associated psychopathology, among pregnant women of different racial/ethnic backgrounds. 180 women provided hair samples for measurement of integrated cortisol levels throughout pregnancy and information regarding their lifetime exposure to stressful and traumatic life events. Results indicate that increased lifetime exposure to traumatic events was associated with significantly greater hair cortisol over the course of pregnancy. Similarly, greater lifetime exposure to stressful and traumatic events weighted by reported negative impact (over the previous 12 months) was associated with significantly greater hair cortisol during pregnancy. All analyses controlled for maternal age, education, body mass index (BMI), use of inhaled corticosteroids, race/ethnicity, and post-traumatic stress disorder (PTSD) and depressive symptoms. Following stratification by race/ethnicity, associations between stressful and traumatic life events and hair cortisol were found among Black women only. This is the first study to consider associations between lifetime stress exposures and hair cortisol in a sociodemographically diverse sample of pregnant women. Increased exposure to stressful and traumatic events, independent of PTSD and depressive symptoms, was associated with higher cortisol production, particularly in Black women. Future research should investigate the influence of such increased cortisol exposure on developmental outcomes among offspring.

Maternal Childhood Maltreatment History and Child Mental Health: Mechanisms in Intergenerational Effects.

The objectives of this study were to examine whether a maternal history of maltreatment in childhood has a detrimental impact on young children’s mental health and to test theoretically and empirically informed pathways by which maternal history may influence child mental health. Mother–child dyads (N = 187) were evaluated between birth and 64 months of age via home and laboratory observations, medical and child protection record reviews, and maternal interviews to assess maternal history of childhood maltreatment and microsystem and exosystem measures of the caregiving context, including child maltreatment, maternal caregiving quality, stress exposures, and social support. When the children were 7 years of age, mothers and teachers reported on child emotional and behavioral problems. Analyses examined whether the caregiving context variables linked maternal maltreatment history with child emotional and behavioral problems, controlling for child sex (54% male), race/ethnicity (63% White), and family sociodemographic risk at birth. Maltreated mothers experienced greater stress and diminished social support, and their children were more likely to be maltreated across early childhood. By age 7, children of maltreated mothers were at increased risk for clinically significant emotional and behavioral problems. A path analysis model showed mediation of the effects of maternal childhood maltreatment history on child symptoms, with specific effects significant for child maltreatment. Interventions that reduce child maltreatment risk and stress exposures and increase family social support may prevent deleterious effects of maternal childhood maltreatment history on child mental health.