Description

Innovative analyses of cardiovascular (CV) risk markers and heath behaviors in relation to neighborhood stressors are needed to further elucidate mechanisms by which adverse neighborhood conditions lead to poor CV outcomes. We propose to objectively measure physical activity, sedentary behavior, and neighborhood stress through accelerometers, global positioning systems (GPS), and ecological momentary assessment survey (via smartphone survey), linked to biological measures in a sample of White and African American women in Washington, D.C. neighborhoods. We hypothesize that individuals who are living in worse neighborhood environment conditions (e.g., higher poverty, crime, and social disorder) will be associated with higher chronic stress-related neural activity. As a secondary hypothesis, we hypothesize that associations between living in socio-economically disadvantaged neighborhood conditions and adverse biological markers will be moderated/mediated through levels of physical activity, time spent on sedentary activities, and dietary intake. Relationships between living in socio-economically disadvantaged neighborhood conditions and adverse biological markers will be also be mediated through psychosocial factors. In Aim 1, we will test associations between neighborhood environment conditions (e.g., poverty, crime, social disorder) and differences in stress-related neural activity, using PET CT-measured amygdala FDG uptake among a sample of White and African American women in high socio-economic status neighborhoods and low socioeconomic status neighborhoods in Washington D.C. In Aim 2a, we will determine associations between neighborhood environment conditions (e.g., poverty, crime, social disorder) and differences in cardiovascular risk and immune activation. Several measures of cardiovascular risk and immune activation will be performed including: (i) assessment of vascular function (vascular stiffness, vascular inflammation) and (ii) measures of immune function (i.e. flow cytometry for immune cell phenotyping, cytokine/chemokine/cortisol/neurotransmitter profiling, lipidomic analyses for lipid inflammatory intermediates, PBMC telomere length). In Aim 2b, we will assess feasibility and practicality of the use of geospatial tools and methods for measuring environmental factors (i.e. poverty, crime, social disorder) among this sample of women in Washington, DC. In aim 2c, we will examine whether associations between worse neighborhood environment conditions and adverse biological markers may be moderated and/or mediated by health behaviors (i.e., physical activity, sedentary time, dietary intake) and psychosocial factors (i.e., mood) measured via ecological momentary assessment (EMA). This project has a strong potential for improving scientific understanding of how neighborhood stress may influence biological measures of stress-related neural activity, such as amygdala activity, to improve our knowledge on interrelations among biology, environment, and cardiovascular health.