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Sympathetic Responsiveness is not Increased in Women with a History of Hypertensive Pregnancy

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AJP Regulatory Integrative and Comparative Physiology

Published online on

Abstract

Hypertensive pregnancy (HTNP) is a risk factor for future cardiovascular disease. Exaggerated cardiovascular responses to physical stress are also considered an independent marker of cardiovascular disease risk. However, there are limited data regarding the blood pressure (BP) responses to acute stress in women, who have a history of HTNP. Hence, the aim of the study is to compare BP responses to a physical stress in postmenopausal women with a history of HTNP to age- and parity-matched women with a history of normotensive pregnancy (NP). Beat-to-beat BP and heart rate was recorded in 64 postmenopausal women with [age = 58.5 (55.2, 62.2) yrs] and without [age = 59.4 (55.9, 62.4) yrs] a history of HTNP prior to and during isometric handgrip (IHG) exercise (30% of maximal voluntary contraction) to fatigue. Muscle metaboreflex was measured during post-exercise ischemia following IHG exercise. BP variables increased similarly in response to IHG exercise [systolic: NP=11.5 (8.9, 17.6) %, HTNP=11.3 (9.5, 15.9) %; diastolic NP=11.2 (7.9, 13.3) %, HTNP=9.5 (7.1, 14.3) %; mean blood pressure: NP= 9.8 (5.0, 13.6) %, HTNP=7.2 (4.4, 10.4) %)] and post-exercise ischemia [systolic: NP=14.1 (10.3, 23.0) %, HTNP=15.8 (10.6, 21.4) %; diastolic NP=12.2 (4.8, 17.0) %, HTNP=10.4 (5.3, 17.1) %; mean blood pressure: NP= 11.1 (6.1, 17.9) %, HTNP=9.4 (2.9, 14.8) %] in both groups. Although having a history of HTNP is associated with future cardiovascular disease risk, results from this study suggest that the risk may not be manifest through altered cardiovascular-metaboreflex response to physical stressors.