Lack of effect of ovarian cycle and oral contraceptives on baroreceptor and nonbaroreceptor control of sympathetic nerve activity in healthy women

被引:34
作者
Middlekauff, Holly R. [1 ]
Park, Jeanie [2 ]
Gornbein, Jeffrey A. [3 ,4 ]
机构
[1] Univ Calif Los Angeles, David Geffen Sch Med, Dept Med, Div Cardiol, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, Dept Biomath, Los Angeles, CA 90095 USA
[3] Emory Sch Med, Dept Med, Div Renal, Atlanta, GA USA
[4] Atlanta Vet Affairs Med Ctr, Atlanta, GA USA
来源
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY | 2012年 / 302卷 / 12期
基金
美国国家卫生研究院;
关键词
baroreflex control; estrogen; progesterone; ambulatory blood pressure; autonomic nervous system; cold pressor test; MENSTRUAL-CYCLE; BAROREFLEX SENSITIVITY; NEURAL RESPONSES; BLOOD-PRESSURE; ORTHOSTATIC STRESS; YOUNG; ESTROGEN; 17-BETA-ESTRADIOL; REFLEX; SEX;
D O I
10.1152/ajpheart.00579.2011
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Middlekauff HR, Park J, Gornbein JA. Lack of effect of ovarian cycle and oral contraceptives on baroreceptor and nonbaroreceptor control of sympathetic nerve activity in healthy women. Am J Physiol Heart Circ Physiol 302: H2560-H2566, 2012. First published April 27, 2012; doi:10.1152/ajpheart.00579.2011.-Endogenous and exogenous female hormones regulate sympathetic nerve activity (SNA) in animal models, but their impact in humans is controversial. The purpose of this study is to investigate the effects of the ovarian cycle and oral contraceptive pills (OCPs) on SNA. We hypothesized that the effects of endogenous hormones were baroreflex (BR)-mediated and that these cyclical changes in BR control were blunted by OCPs. Furthermore, we hypothesized that the nocturnal fall in blood pressure (BP) ("dipping"), which is sympathetically mediated, also varied with the ovarian cycle. In 23 healthy females (13 OCP users, 10 age-matched, no OCPs), SNA was recorded (microneurography) at rest, during BR activation/deactivation, and cold pressor test (CPT) during low and high hormonal phases. Furthermore, 24-h BP monitoring was performed during low and high hormonal phases. SNA was lower during the low vs. high hormone phase in non-OCP users (17.3 +/- 2.4 vs. 25.4 +/- 3.2 bursts/min, P < 0.001) but was not different between phases in OCP users [15.5 +/- 1.7 vs. 16.6 +/- 2.0 bursts/min, P = not significant (NS)]. BR control of SNA was not different during the hormone phases in either group [SNA (total activity/min) mean slope % change from baseline, no OCP users, low vs. high hormone phase 35.4 +/- 6.2 vs. 29.6 +/- 3.4%, P = NS and OCP users, low vs. high hormone phase 35.7 +/- 3.9 vs. 33.5 +/- 3.5%, P = NS]. SNA activation during CPT was not impacted by hormonal phase or OCP use. Finally, nondipping was not different between OCP users and nonusers, although there was a trend for nondipping to occur more frequently in the OCP users. SNA varies during the ovarian cycle in women in the absence of OCPs. This modulation cannot be attributed to cyclical changes in the BR sensitivity.
引用
收藏
页码:H2560 / H2566
页数:7
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