Exploring the timing and duration of maternal stress exposure: Impacts on early childhood BMI

Prenatal maternal cortisol, stress and anxiety, and childhood obesity at 5 years: a nested case-control study

BACKGROUND

Paediatric obesity is a global public health issue. Prenatal maternal mental health is potentially implicated in the development of childhood obesity. This study examined associations between prenatal maternal cortisol, self-reported stress, anxiety and depression in the second trimester, and childhood overweight and obesity at 5 years of age.

METHODS

A nested case-control study was conducted using data from the Irish prospective longitudinal birth cohort SCOPE BASELINE. Cases were children with overweight or obesity, operationalised as having a BMI z-score above +2 standard deviations. Controls were children with a BMI z-score between -0.5 and 0.5 standard deviations at 5 years of age. Two to one matching by sex was conducted. Thirty-eight cases and 83 sex-matched controls were included. Maternal serum cortisol concentration and self-reported stress, anxiety and depression were measured at 15 ± 1 and 20 ± 1 weeks gestation. Conditional logistic regression analyses were conducted to examine associations between prenatal maternal cortisol and self-reported stress, anxiety and depression, and childhood overweight and obesity.

RESULTS

Despite some evidence for associations between anxiety and depression, and child BMI z-scores in univariate analyses, adjusted models indicated no associations between prenatal maternal stress (OR: 1.02, 95% CI: 0.94-1.12), anxiety (OR: 1.03, 95% CI: 0.97-1.09), depression (OR: 1.04, 95% CI: 0.91-1.19), or cortisol concentration (OR: 0.99, 95% CI: 0.99-1.00) and child BMI z-score.

CONCLUSION

Our findings do not provide support for associations between foetal exposure during the second trimester of pregnancy and maternal cortisol, stress and anxiety, and childhood overweight or obesity at 5 years of age.

Maternal racism experience and cultural identity in relation to offspring telomere length

Racism is a determinant of individual and offspring health. Accelerated telomere shortening, an indicator of cellular aging, is a potential mechanism through which parental experience of racism could affect offspring. Here we longitudinally evaluated the relationship between maternal lifetime experience of an ethnically-motivated verbal or physical attack, as reported in pregnancy, with offspring telomere length in 4.5-year-old children. We also explored the potential association between positive feelings about one's culture and offspring telomere length. Data come from a nationally representative, multi-ethnic birth cohort in Aotearoa New Zealand (NZ) (Māori N = 417, Pacific N = 364, Asian N = 381). In models adjusting for covariates, including socioeconomic status and health status, Māori mothers who experienced an ethnically-motivated physical attack had children with significantly shorter telomere length than children of Māori mothers who did not report an attack (B = - 0.20, p = 0.01). Conversely, Māori mothers who had positive feelings about their culture had offspring with significantly longer telomeres (B = 0.25, p = 0.02). Our results suggest that ethnicity-based health inequities are shaped by racism, with impacts for clinical care and policy. Future research should also evaluate the potential protective effects of positive cultural identity.

Effects of maternal stress and/or anxiety interventions in the first 1000 days:Systematic review of reviews

OBJECTIVE

Effective interventions are needed to mitigate effects of stress and anxiety from conception and up to two years postpartum (the first 1000 days), but it is unclear what works, for what populations and at what time points. This review aimed to synthesise evidence from existing reviews of the effects of stress and anxiety interventions.

METHODS

A systematic review of systematic reviews was conducted. PsycINFO, CINAHL, MEDLINE and the Cochrane databases were searched (inception to January 2020). Reviews were eligible if they examined effects of interventions during the first 1000 days on women's stress and/or anxiety. Extracted data were narratively synthesised. Review quality was assessed using existing recommendations including the AMSTAR tool .

RESULTS

Thirty-four reviews were eligible for inclusion; 21 demonstrated high methodological quality. Cognitive behavioural therapy demonstrates some beneficial effects for anxiety across the first 1000 days for general and at-risk populations. Support-based interventions demonstrate effects for stress and anxiety for at-risk mothers in the postpartum. Music, yoga and relaxation demonstrate some effects for stress and anxiety, but studies are limited by high risk of bias.

CONCLUSION

Existing evidence is inconsistent. Cognitive behavioural therapy and support-based interventions demonstrate some benefits. Further methodologically and conceptually robust research is needed.

Maternal mental health and early childhood development: Exploring critical periods and unique sources of support

BACKGROUND

The objective of this study was to explore associations between maternal depression and anxiety during early sensitive periods, child social-emotional and behavioral problems and the moderating roles of financial, instrumental, and partner emotional support.

METHODS

Analyses was conducted using data from the Fragile Families and Child Wellbeing Study. Hierarchical linear regression modeling was used to explore associations between maternal depression and anxiety at 1- and 3-years postpartum, three unique types of social support, and childhood behavioral problems at 5-years of age (n = 2,827).

RESULTS

Mothers who were depressed at one or both timepoints, compared to nondepressed mothers, reported higher externalizing behavioral problems scores of 1.96 and 2.90, and internalizing behavioral problems scores of 1.16 and 2.20, respectively, at 5-years of age (both p < .01), after controlling for covariates. Financial, instrumental, and partner emotional support were independently and inversely associated with behavioral problems (p < .05); however, none of these types of support moderated the relationship between maternal depression and behavioral problems, after controlling for covariates.

IMPLICATIONS

Promoting maternal mental health as well as different sources of support throughout the first five years of life, instead of one critical period, may help to reduce the burden of chronic disease in the next generation.

Prenatal Stress and Early Childhood Body Mass Index: A Path Analysis Approach

OBJECTIVES

Stress experienced by mothers during the prenatal period can have negative impacts on offspring development. Elevated BMI in childhood in response to early stress experience is a particularly critical outcome of interest since high BMI in childhood is associated with diabetes, heart disease and stroke in later life. The primary objective of this study was to analyze pathways between prenatal stress and early childhood BMI at 54-months of age and to begin to explore ethnic variations in these pathways.

METHODS

This study used the Growing Up in New Zealand (GUiNZ) dataset, which is a longitudinal, representative birth cohort study that began with recruiting pregnant women in 2009 and 2010 in Auckland, New Zealand. Path analysis modeling was used to explore risk and protective pathways between prenatal maternal stress and early childhood body mass index (BMI) at 54-months of age and differences by ethnicity (n = 5510).

RESULTS

Prenatal stress was positively associated with early childhood BMI at 54-months and maternal nutrition behaviors and length of exclusive breastfeeding mediated this direct relationship (χ² (1) = 0.83, p = 0.36; AIC = 50,496). Mediation and moderation paths varied by ethnicity.

CONCLUSIONS FOR PRACTICE

These findings contribute to the understanding of the intergenerational transmission of stress with respect to early childhood obesity. Reducing early stress exposure and/or addressing mediating and moderating factors linking stress experience with obesity development may prove to be more effective than attempting to alter health behaviors and trajectories in adulthood.

Effects of interventions for women and their partners to reduce or prevent stress and anxiety: A systematic review

BACKGROUND

The period from conception to two years postpartum (the first 1000 days) represents a normative transitional period, which can be potentially stressful for some parents. Parental stress and anxiety adversely impacts psychological and physical health for parents and children.

AIM

The aim of this review is to systematically examine effects of interventions for women and their partners to reduce or prevent stress and/or anxiety during the first 1000 days.

METHODS

MEDLINE, Embase, CINAHL, PsychINFO, and Maternity and Infant Care were searched from inception to March 2019. Randomised controlled trials examining intervention effects on parental stress and/or anxiety during first 1000 days were eligible for inclusion. Data were independently extracted by two reviewers and narratively synthesised.

FINDINGS

Fifteen interventions, reported in 16 studies, met inclusion criteria (n=1911 participants). Overall, findings were inconsistent and the majority of trials demonstrated high risk of bias. Interventions were predominantly delivered to women during pregnancy and only two studies included fathers. There was some evidence that adapting interventions to the pre and postnatal periods provided benefits for stress and anxiety reduction, however there was limited evidence for individual intervention types or approaches.

CONCLUSIONS

There is currently inconsistent evidence of what interventions are most effective for women during the first 1000 days and there is insufficient evidence for any interventions for male partners during this period. There is a clear need for rigorous development and examination of interventions developed specifically to reduce or prevent stress and/or anxiety across the first 1000 days.

Maternal stress in the first 1000 days and risk of childhood obesity: a systematic review

Objective: Maternal stress is associated with adverse child outcomes. Conception to 2-years postpartum (the first 1000 days) is a developmentally sensitive period for stress exposure. The role of maternal stress in the first 1000 days on child obesity risk is unclear. This review systematically examines the relationship between maternal stress across the first 1000 days and child obesity risk. Methods: The Cochrane Library, MEDLINE, PsycINFO, EMBASE, CINAHL, and Maternity and Infant Care were searched from inception to June 2018. Eligible studies included women who experienced maternal stress in the first 1000 days; an included a measure of maternal stress and of child anthropometrics. Results: Sixteen studies met inclusion criteria, the majority of these examined prenatal stress exposure. Inconsistent effects were observed for psychological and physiological stress responses, on child weight outcomes. Environmental stress exposures, including natural disaster and bereavement, were more consistently associated with increased obesity risk. Conclusion: This review does not provide support for the effects of psychological or physiological maternal stress on child weight outcomes; there is some evidence of associations between environmental stress exposures and greater childhood adiposity. Variation in conceptualisation and measurement of stress, timing of stress exposure, and limited examination of stress-related behaviours were noted.

A Mixed-Methods Pilot Study of Perinatal Risk and Resilience During COVID-19

Introduction/Objectives: National guidelines underscore the need for improvement in the detection and treatment of mood disorders in the perinatal period. Exposure to disasters can amplify perinatal mood disorders and even have intergenerational impacts. The primary aim of this pilot study was to use mixed-methods to better understand the mental health and well-being effects of the coronavirus disease 2019 (COVID-19) pandemic, as well as sources of resilience, among women during the perinatal period. Methods: The study team used a simultaneous exploratory mixed-methods design to investigate the primary objective. Thirty-one pregnant and postpartum women participated in phone interviews and were invited to complete an online survey which included validated mental health and well-being measures. Results: Approximately 12% of the sample reported high depressive symptomatology and 60% reported moderate or severe anxiety. Forty percent of the sample reported being lonely. The primary themes related to stress were uncertainty surrounding perinatal care, exposure risk for both mother and baby, inconsistent messaging from information sources and lack of support networks. Participants identified various sources of resilience, including the use of virtual communication platforms, engaging in self-care behaviors (eg, adequate sleep, physical activity, and healthy eating), partner emotional support, being outdoors, gratitude, and adhering to structures and routines. Conclusions: Since the onset of COVID-19, many pregnant and postpartum women report struggling with stress, depression, and anxiety symptomatology. Findings from this pilot study begin to inform future intervention work to best support this highly vulnerable population.

The relationship between maternal stress during pregnancy and up to two years after birth and risk of child overweight and obesity: Protocol for a Systematic Review

Background: Childhood obesity presents a significant public health challenge globally. The period from conception to two years after birth, the first 1000 days, represents a critical period during which the experience of maternal stress may be related to the development of childhood obesity.  Research to date suggests some positive associations between maternal stress during the first 1000 days and childhood obesity, but findings are inconsistent and have not yet been comprehensively synthesised. The purpose of this review is to systematically examine the association between maternal stress during the first 1000 days and the risk of child overweight and obesity. Methods: The following electronic databases will be searched from inception using a detailed search strategy: the Cochrane Library, MEDLINE, PsycINFO, EMBASE, CINAHL, Maternity and Infant Care, and Web of Science. Cohort, case-control, and cross-sectional studies examining maternal stress during the first 1000 days and child overweight and obesity up to the age of 10 years will be included. Titles, abstracts and full articles will be screened by two investigators independently to identify eligible studies. A standardised data extraction form will be used to extract data including: study design; maternal stress exposure; child outcome; exclusion criteria; participant characteristics; and assessment methods. The Cochrane Collaboration’s bias classification tool for observational studies will be used to assess study quality. This protocol is reported according to the Preferred Reporting Items for Systematic reviews and Meta-Analyses protocol (PRISMA-P) checklist, and the systematic review will be conducted and reported following the PRISMA checklist. If possible, random effects models will be used to perform meta-analyses. Ethics and dissemination: Ethical approval is not required for this study as it will not involve conducting experimental research, nor include identifying personal data.  The systematic review will be disseminated in peer-reviewed journals. PROSPERO registration number: CRD42018100363

Effects of maternal stress during pregnancy and up to two years after birth on risk of child overweight and obesity: Protocol for a Systematic Review

Background: Childhood obesity presents a significant public health challenge globally. The period from conception to two years after birth, the first 1000 days, represents a critical period during which the experience of maternal stress may be related to the development of childhood obesity.  Research to date suggests some positive associations between maternal stress during the first 1000 days and childhood obesity, but findings are inconsistent and have not yet been comprehensively synthesised. The purpose of this review is to systematically examine the association between maternal stress during the first 1000 days and the risk of child overweight and obesity. Methods: The following electronic databases will be searched from inception using a detailed search strategy: the Cochrane Library, MEDLINE, PsycINFO, EMBASE, CINAHL, Maternity and Infant Care, and Web of Science. Cohort, case-control, and cross-sectional studies examining maternal stress during the first 1000 days and child overweight and obesity up to the age of 10 years will be included. Titles, abstracts and full articles will be screened by two investigators independently to identify eligible studies. A standardised data extraction form will be used to extract data including: study design; maternal stress exposure; child outcome; exclusion criteria; participant characteristics; and assessment methods. The Cochrane Collaboration’s bias classification tool for observational studies will be used to assess study quality. This protocol is reported according to the Preferred Reporting Items for Systematic reviews and Meta-Analyses protocol (PRISMA-P) checklist, and the systematic review will be conducted and reported following the PRISMA checklist. If possible, random effects models will be used to perform meta-analyses. Ethics and dissemination: Ethical approval is not required for this study as it will not involve conducting experimental research, nor include identifying personal data.  The systematic review will be disseminated in peer-reviewed journals. PROSPERO registration number: CRD42018100363