Circadian and sex differences in post-ischemic vasodilation and reactive hyperemia in young individuals and elderly with and without type 2 diabetes

IF 1.9 4区医学 Q3 HEMATOLOGY Microcirculation Pub Date : 2023-05-29 DOI:10.1111/micc.12818

Alessandro Gentilin, Paolo Moghetti, Antonio Cevese, Anna Vittoria Mattioli, Federico Schena, Cantor Tarperi

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Abstract

Objective

Cardiovascular events show morning preference and sex differences, and are related to aging and type 2 diabetes. We assessed circadian variations and sex differences in vascular conductance (VC) and blood flow (BF) regulations following a brief bout of forearm ischemia.

Methods

Young healthy individuals (H18-30) and elderly without (H50-80) and with type 2 diabetes (T2DM50-80) of both sexes were included. Forearm VC and BF, and mean arterial pressure (MAP) at baseline and following circulatory reperfusion were measured at 6 a.m. and 9 p.m.

Results

In the morning compared to evening, following reperfusion, the VC and BF increments were similar in H18-30 (p>.71), but lower in H50-80 (p<.001) and T2DM50-80 (p<.01). VC and BF following circulatory reperfusion were higher in men than women in H18-30 (p<.001), but similar between sexes in the older groups (p>.23).

Conclusions

Forearm vasodilation following reperfusion is attenuated in the morning in the elderly, impairing BF towards an ischemic area. Diabetes does not affect the circadian regulation of VC and BF, but that of MAP. There are sex differences in VC and BF at baseline and after circulatory reperfusion at a young age, being greater in men, which disappear with aging without being affected by diabetes.

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患有和不患有2型糖尿病的年轻人和老年人缺血性血管舒张和反应性充血的昼夜节律和性别差异。

目的：心血管事件表现出早晨偏好和性别差异，与衰老和2型糖尿病有关。我们评估了前臂短暂缺血后血管传导（VC）和血流（BF）调节的昼夜节律变化和性别差异。方法：纳入年轻健康个体（H18-30）和未患H50-80和患有2型糖尿病的老年人（T2DM50-80）。6时测量前臂VC和BF以及基线和循环再灌注后的平均动脉压（MAP）上午9点结果：早上与晚上相比，再灌注后，H18-30的VC和BF增量相似（p>.71），但H50-80较低（p.23）。结论：老年人再灌注后前臂血管舒张在早上减弱，BF向缺血区减弱。糖尿病不影响VC和BF的昼夜节律调节，但影响MAP的昼夜节律。在基线和年轻时循环再灌注后，VC和BF存在性别差异，男性更大，随着年龄的增长而消失，不受糖尿病的影响。

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来源期刊

Microcirculation 医学-外周血管病

CiteScore

5.00

自引率

4.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal features original contributions that are the result of investigations contributing significant new information relating to the vascular and lymphatic microcirculation addressed at the intact animal, organ, cellular, or molecular level. Papers describe applications of the methods of physiology, biophysics, bioengineering, genetics, cell biology, biochemistry, and molecular biology to problems in microcirculation. Microcirculation also publishes state-of-the-art reviews that address frontier areas or new advances in technology in the fields of microcirculatory disease and function. Specific areas of interest include: Angiogenesis, growth and remodeling; Transport and exchange of gasses and solutes; Rheology and biorheology; Endothelial cell biology and metabolism; Interactions between endothelium, smooth muscle, parenchymal cells, leukocytes and platelets; Regulation of vasomotor tone; and Microvascular structures, imaging and morphometry. Papers also describe innovations in experimental techniques and instrumentation for studying all aspects of microcirculatory structure and function.