[GESTASTRES cohort study protocol on the effects of stress during pregnancy by measuring the cortisol in women's and newborn's hair].

The aim was to present the longitudinal study protocol on the effects of perinatal stress from conception to one year of age. Stress is associated to psychopathological, cardiovascular and inmunological diseases. During pregnancy, the activation of the Hipotalamic-Pituitary-Adrenal results in an increased release of cortisol.