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  • Title: 24-h urinary free cortisol from mid-pregnancy to 3-months postpartum: gender and parity differences and effects.
    Author: Conde A, Figueiredo B.
    Journal: Psychoneuroendocrinology; 2014 Dec; 50():264-73. PubMed ID: 25247747.
    Abstract:
    BACKGROUND: Pregnancy and postpartum have been associated to several physiological changes; however, empirical evidence was almost exclusively obtained in primiparous women and few studies focus on hormonal changes in men and second-time parents. The main aim of this study is to examine 24-h urinary free cortisol from mid-pregnancy to 3-months postpartum, comparing women/men and first/second-time parents. METHODS: Twenty-six women and 22 men (N=48) were recruited from an antenatal obstetric unit in Porto, Portugal. 24-h urinary free cortisol was measured at the 2nd and 3rd trimester and at 3-months postpartum. Repeated measures analyses of variance were conducted, in order to analyze 24-h urinary free cortisol patterns of change over this period. Gender and parity were included in the analyses as potential modifiers, in order to compare women and men, and first- and second-time parents. RESULTS: An increase from the 2nd to the 3rd trimester (p=.006) and a decrease from the 3rd trimester to 3-months postpartum (p=.005) were reported in all parents' 24-h urinary free cortisol. The interaction effects for Time*Gender (p=.03) and Time*Parity (p=.02) were found. Women and first-time parents revealed higher levels, while men and second-time parents showed lower 24-h urinary free cortisol levels at the 2nd trimester than at 3-months postpartum. CONCLUSIONS: Findings appear to clarify the direction, as well as, the timing, gender and parity extension of 24-h urinary free cortisol changes from mid-pregnancy to 3-months postpartum. The same pattern of change in all parents' 24-h urinary free cortisol from mid-pregnancy to 3-months postpartum is consistent with the proposed role of hormones in preparation to parenting. Gender and parity differences and effects on 24-h urinary free cortisol are also consistent with cortisol as a stress biomarker for higher challenges associated to pregnancy and childbirth in women and first-time parents versus higher demands related to after childbirth parenting in men and second-time parents.
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