The SMART Moms Program: A Randomized Trial of the Impact of Stress Management on Perceived Stress and Cortisol in Low-Income Pregnant Women.

BACKGROUND: Dysregulations in maternal hypothalamus-pituitary-adrenal function and the end product, cortisol, have been associated with a heightened risk for stress-related health complications during pregnancy and post partum. Given the adverse health impact that maternal cortisol may have on expectant mothers and their infants, empirically-based prenatal interventions are needed to target optimal management of stress and its biological effects in at-risk pregnant women, a primary example of which is cognitive behavioral stress management (CBSM). This randomized-controlled trial examined the effects of a prenatal CBSM intervention on reduction in perceived stress and regulation of salivary cortisol patterns [i.e., overall cortisol output (area under the curve), cortisol awakening response (CAR), diurnal slope] during pregnancy and the early postpartum period, as compared to a control group.

METHODS: One hundred low-income pregnant women (71% Latina; 76% annual income < $20 K) with low or high anxiety during pregnancy were randomized (stratified by anxiety) to either an eight-week CBSM group intervention (n = 55) or a control group (n = 45). They provided seven salivary cortisol samples (four am samples, 12 pm, 4 pm, and 8 pm samples on one collection day) at baseline (1st trimester; < 17 weeks of gestation), after their prenatal program (2nd trimester), and also in the third trimester and at three months post partum.

RESULTS: Women receiving CBSM had lower perceived stress levels throughout pregnancy and early post partum compared to women in the control group (p = .020). Among women with high prenatal anxiety, those in CBSM showed a steeper decline in their diurnal cortisol at three months post partum compared to those in the control group (p = .015). Further, non-Latina women in CBSM had a lower CAR at three months post partum compared to non-Latina women in the control group (p = .025); these randomization group differences on the CAR were not observed among Latina women.

CONCLUSIONS: These findings provide preliminary support for the efficacy of prenatal CBSM interventions in improving stress outcomes among low-income pregnant women and suggest the need to test the effects of these interventions on a larger scale for improving maternal and infant health outcomes long-term.