Paige K Berger1, Jasmine F Plows1, Roshonda B Jones1, Norman K Pollock2, Tanya L Alderete3, Ji Hoon Ryoo1, Michael I Goran1. 1. Department of Pediatrics, Children's Hospital Los Angeles, The University of Southern California, Los Angeles, CA, USA. 2. Department of Population Health Sciences, Medical College of Georgia, Augusta University, Augusta, GA, USA. 3. Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.
Abstract
BACKGROUND: It is unknown to what extent higher maternal blood pressure (BP) in early postpartum impacts the relationship between higher maternal weight status and greater infant weight gain in early postpartum. OBJECTIVE: To evaluate the mediating role of higher maternal BP at 1 month postpartum on the association between higher maternal weight status at 1 month postpartum and greater infant weight gain over 6 months postpartum. METHODS: Participants were 169 Hispanic mother-infant pairs. Maternal body mass index (BMI) and BP were assessed at 1 month postpartum. Infant weight was measured at 1 and 6 months postpartum to calculate weight-for-age z scores (WAZ). Multiple linear regression models were used for prediction, and Sobel test was used to determine mediation. RESULTS: Controlling for maternal pre-pregnancy BMI, age, delivery mode, infant sex, and infant birth weight revealed that both maternal BMI (β = .29) and BP (β = .32) predicted infant WAZ gain (both P ≤ .03). However, the relationship between infant WAZ gain and maternal BMI was no longer significant after further adjustment for maternal BP, which remained significant (P < .05). Maternal BP explained 23.6% (Sobel T = 2.01) of the association between maternal BMI at 1 month and infant WAZ gain over 6 months. CONCLUSION: Our data suggest that higher maternal weight status at 1 month postpartum is related to greater infant weight gain over 6 months postpartum, and this relationship is mediated by higher maternal BP at 1 month postpartum.
BACKGROUND: It is unknown to what extent higher maternal blood pressure (BP) in early postpartum impacts the relationship between higher maternal weight status and greater infantweight gain in early postpartum. OBJECTIVE: To evaluate the mediating role of higher maternal BP at 1 month postpartum on the association between higher maternal weight status at 1 month postpartum and greater infantweight gain over 6 months postpartum. METHODS:Participants were 169 Hispanic mother-infant pairs. Maternal body mass index (BMI) and BP were assessed at 1 month postpartum. Infant weight was measured at 1 and 6 months postpartum to calculate weight-for-age z scores (WAZ). Multiple linear regression models were used for prediction, and Sobel test was used to determine mediation. RESULTS: Controlling for maternal pre-pregnancy BMI, age, delivery mode, infant sex, and infant birth weight revealed that both maternal BMI (β = .29) and BP (β = .32) predicted infant WAZ gain (both P ≤ .03). However, the relationship between infant WAZ gain and maternal BMI was no longer significant after further adjustment for maternal BP, which remained significant (P < .05). Maternal BP explained 23.6% (Sobel T = 2.01) of the association between maternal BMI at 1 month and infant WAZ gain over 6 months. CONCLUSION: Our data suggest that higher maternal weight status at 1 month postpartum is related to greater infantweight gain over 6 months postpartum, and this relationship is mediated by higher maternal BP at 1 month postpartum.
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