ESTRADIOL, PROGESTERONE AND CARDIOVASCULAR-RESPONSE TO STRESS

The present study examined the relationship between endogenous estradi ol and progesterone levels and cardiovascular activity at rest and dur ing stress in healthy young women. Subjects were rested in both the fo llicular and luteal phases of the menstrual cycle. Results indicated t hat, during the luteal phase, higher levels of estradiol were associat ed with lower levels of cardiac output responses to the combined video game and speech tasks, and lower levels of heart rate and systolic bl ood pressure responses to the cold presser; estradiol levels were also associated positively with PEP responses to the cold presser but only under high levels of progesterone. Additionally, during the luteal ph ase, higher levels of progesterone were associated with higher TPR and lower stroke volume responses to the cold presser. Tn contrast, durin g the follicular phase, higher levels of progesterone were associated with lower vascular resistance responses to the cold presser. Consiste nt with data from studies using exogenous estrogens, these results sug gest that estradiol may contribute to a lowering of cardiovascular res ponses to stress. Copyright 1996 Elsevier Science Ltd.