Sukhee Ahn1, Elizabeth J Corwin2. 1. College of Nursing, Chungnam National University, Daejeon, Republic of Korea. Electronic address: sukheeahn@cnu.ac.kr. 2. Nell Hodgson Woodruff School of Nursing, Emory University, 1520 Clifton Road NE, Room 244, Atlanta, GA 30322, United States. Electronic address: ejcorwi@emory.edu.
Abstract
BACKGROUND: Research suggests that exclusive breastfeeding may have a stress-protective role in postpartum depression; however, less is known about the underlying mechanisms by which this protection may occur or whether the protective relationship holds for women who mix breast and bottle feeding. OBJECTIVES: To examine patterns of the stress response, inflammation, and depressive symptoms among women predominantly breastfeeding or bottle feeding their infants at 6 months postpartum. DESIGN: A part of a larger longitudinal study across 6 months postpartum investigating the psychoneuroimmunology (PNI) of postpartum depression. SETTING: Prenatal clinics and community. PARTICIPANTS: One hundred nineteen postpartum women who met inclusion/exclusion criteria and followed up from the prenatal period to postpartum 6 months. METHODS: Data were collected during seven home visits occurring during the 3rd trimester (weeks 32-36) and on postpartum days 7 and 14, months 1, 2, 3, and 6. Women completed stress and depression surveys and provided blood for pro- (IL-1β, IL-6, IL-8, TNF-a, IFN-γ) and anti-inflammatory (IL-10) cytokines, and collected saliva for diurnal cortisol. RESULTS: Self-report of predominant breastfeeding during 6 months postpartum ranged from 91.9% at day 7 to 70.6% at month 6 postpartum. There were no associations between the pattern of feeding and depressive symptoms. Biological differences, however, existed between the groups, with levels of salivary cortisol at 8 AM and 8:30 AM at month 6 higher and levels of IL-6 at month 6 lower in women who primarily breastfed compared to those who primarily bottle fed their infants after controlling for confounding variables. CONCLUSIONS: Breastfeeding was not related to postpartum depression however differences in stress and inflammatory markers are apparent at month 6 postpartum.
BACKGROUND: Research suggests that exclusive breastfeeding may have a stress-protective role in postpartum depression; however, less is known about the underlying mechanisms by which this protection may occur or whether the protective relationship holds for women who mix breast and bottle feeding. OBJECTIVES: To examine patterns of the stress response, inflammation, and depressive symptoms among women predominantly breastfeeding or bottle feeding their infants at 6 months postpartum. DESIGN: A part of a larger longitudinal study across 6 months postpartum investigating the psychoneuroimmunology (PNI) of postpartum depression. SETTING: Prenatal clinics and community. PARTICIPANTS: One hundred nineteen postpartum women who met inclusion/exclusion criteria and followed up from the prenatal period to postpartum 6 months. METHODS: Data were collected during seven home visits occurring during the 3rd trimester (weeks 32-36) and on postpartum days 7 and 14, months 1, 2, 3, and 6. Women completed stress and depression surveys and provided blood for pro- (IL-1β, IL-6, IL-8, TNF-a, IFN-γ) and anti-inflammatory (IL-10) cytokines, and collected saliva for diurnal cortisol. RESULTS: Self-report of predominant breastfeeding during 6 months postpartum ranged from 91.9% at day 7 to 70.6% at month 6 postpartum. There were no associations between the pattern of feeding and depressive symptoms. Biological differences, however, existed between the groups, with levels of salivary cortisol at 8 AM and 8:30 AM at month 6 higher and levels of IL-6 at month 6 lower in women who primarily breastfed compared to those who primarily bottle fed their infants after controlling for confounding variables. CONCLUSIONS: Breastfeeding was not related to postpartum depression however differences in stress and inflammatory markers are apparent at month 6 postpartum.
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