Abstract-Men are at greater risk for cardiovascular and renal disease than are age-matched, premenopausal women.Recent studies using the technique of 24-hour ambulatory blood pressure monitoring have shown that blood pressure is higher in men than in women at similar ages. After menopause, however, blood pressure increases in women to levels even higher than in men. Hormone replacement therapy in most cases does not significantly reduce blood pressure in postmenopausal women, suggesting that the loss of estrogens may not be the only component involved in the higher blood pressure in women after menopause. In contrast, androgens may decrease only slightly, if at all, in postmenopausal women. In this review the possible mechanisms by which androgens may increase blood pressure are discussed. Findings in animal studies show that there is a blunting of the pressure-natriuresis relationship in male spontaneously hypertensive rats and in ovariectomized female spontaneously hypertensive rats treated chronically with testosterone. The key factor in controlling the pressure-natriuresis relationship is the renin-angiotensin system (RAS). The possibility that androgens increase blood pressure via the RAS is explored, and the possibility that the RAS also promotes oxidative stress leading to production of vasoconstrictor substances and reduction in nitric oxide availability is proposed. Key Words: sex characteristics Ⅲ hypertension Ⅲ angiotensin II Ⅲ nitric oxide Ⅲ oxidative stress I n this review gender differences in blood pressure control are explored, including possible mechanisms by which androgens may increase blood pressure.
Gender Differences in Blood Pressure Regulation in HumansMen are generally at greater risk for cardiovascular and renal disease than are age-matched, premenopausal women. Recent studies using the technique of 24-hour ambulatory blood pressure monitoring have shown that blood pressure is higher in men than in women at similar ages. As shown in Figure 1, Wiinber and colleagues 1 studied 352 normotensive (for age) Danish men and women, aged 20 to 79 years, and found that blood pressure increased with aging in both men and women, but that men had higher 24-hour mean blood pressure, by approximately 6 to 10 mm Hg, than did women, until the age of 70 to 79 years, when blood pressure was similar for men and women. Khoury and colleagues 2 performed ambulatory blood pressure monitoring on 131 men and women, aged 50 to 60 years, and found that men had higher blood pressure than did women. Findings were similar in a meta-analysis study performed by Staessen et al. 3 In addition, the Third National Health and Nutrition Evaluation Survey (NHANES III) showed that, in general, men had higher blood pressure than women through middle age. 4 Furthermore, the incidence of uncontrolled hypertension is also greater in men than in women. 5After menopause, however, blood pressure increases in women as well. The data from NHANES III, shown in Figure 2, confirmed that by 60 to 69 years of age, non-Hispanic black and Hi...