Effects of acute hyperglycemia on the exercise pressor reflex in healthy rats.

Effects of acute hyperglycemia on the exercise pressor reflex in healthy rats.
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DOI:
10.1016/j.autneu.2020.102739
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发表时间:
2020-12
期刊:
Autonomic neuroscience : basic & clinical
影响因子:
--
通讯作者:
Stone AJ
Stone AJ
中科院分区:
其他
文献类型:
--
作者:
Huo Y;Grotle AK;Ybarbo KM;Lee J;Harrison ML;Stone AJ

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运动加压反射在2型糖尿病患者中被夸大。高血糖是T2 DM的一个主要特征,可能是导致这种夸大反应的原因之一。然而,独立于T2 DM的急性高血糖对运动升压反射的单独影响尚不清楚。因此,本研究的目的是确定急性局部高血糖暴露对健康大鼠运动加压反射及其两个组成部分,即机械反射和代谢反射的影响。为此,我们研究了动脉内注射葡萄糖(0.25g/mL)对禁食未麻醉去脑SD大鼠30只S静态收缩(即运动加压反射)和肌腱拉伸(即机械反射)以及动脉内注射乳酸(24 MM)(即代谢反射)的心血管反应的影响。我们测量并比较了葡萄糖输注前后平均动脉压(MAP)和心率(HR)的变化。我们发现,急性葡萄糖输注对静态收缩(ΔMAP:15±2 mm Hg,后:12±2 mm Hg;n=8,p>0.05)、肌腱拉伸(ΔMAP:前:12±1 mm Hg,后:12±3 mm Hg;n=8,p>0.05)或乳酸注射(ΔMAP:13±2 mm Hg,后:17±3 mm Hg;n=9,p>0.05)的升压反应没有影响。同样,心脏加速器的反应不受葡萄糖输注的影响,p>0.05。总而言之,这些发现表明,急性局部高血糖暴露不会影响运动升压反射或其任何一个组成部分。
The exercise pressor reflex is exaggerated in type 2 diabetes mellitus (T2DM). Hyperglycemia, a main characteristic of T2DM, likely contributes to this exaggerated response. However, the isolated effect of acute hyperglycemia, independent of T2DM, on the exercise pressor reflex is not known. Therefore, the purpose of this study was to determine the effect of acute, local exposure to hyperglycemia on the exercise pressor reflex and its two components, namely the mechanoreflex and the metaboreflex, in healthy rats. To accomplish this, we determined the effect of an acute intra-arterial glucose infusion (0.25 g/mL) on cardiovascular responses to static contraction (i.e., exercise pressor reflex) and tendon stretch (i.e., mechanoreflex) for 30 s, as well as intra-arterial lactic acid (24 mM) injection (i.e., metaboreflex) in fasted unanesthetized, decerebrated Sprague-Dawley rats. We measured and compared changes in mean arterial pressure (MAP) and heart rate (HR) before and after glucose infusion. We found that acute glucose infusion did not affect the pressor response to static contraction (ΔMAP: before: 15 ± 2 mmHg, after: 12 ± 2 mmHg; n=8, p > 0.05), tendon stretch (ΔMAP: before: 12 ± 1 mmHg, after: 12 ± 3 mmHg; n=8, p > 0.05), or lactic acid injection (ΔMAP: before: 13 ± 2 mmHg, after: 17 ± 3 mmHg; n=9, p > 0.05). Likewise, cardioaccelerator responses were unaffected by glucose infusion, p > 0.05 for all. In conclusion, these findings suggest that acute, local exposure to hyperglycemia does not affect the exercise pressor reflex or either of its components.
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