首页> 外文期刊>American Journal of Physiology >Senescence alters blood flow responses to acute heat stress.
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Senescence alters blood flow responses to acute heat stress.

机译:衰老改变血流反应对急性热应激。

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Renal and splanchnic sympathetic nerve discharge (SND) responses to heating are significantly reduced in senescent compared with young Fischer-344 (F344) rats (Kenney MJ and Fels RJ. Am J Physiol Regul Integr Comp Physiol 283: R513-R520, 2002). However, the functional significance of this finding is not known. We tested the hypothesis that blood flow distribution profiles to heating are altered in senescent (24 mo old) compared with mature (12 mo old) and young (3 mo old) F344 rats. Visceral organ, skeletal muscle, and tail blood flows were determined with the radionuclide-tagged microsphere technique before (control, 38 degrees C) and during heating that increased body temperature to 41 degrees C in anesthetized F344 rats. Vascular conductance in the kidney, stomach, large intestine, pancreas, spleen, and tail was significantly reduced during control before heating in senescent compared with young F344 rats. Heating significantly decreased kidney, stomach, small and large intestine, and pancreas vascular conductance in young and mature but not senescent F344 rats. Vascular conductance at 41 degrees C in the kidney and small intestine was significantly lower and in the stomach tended to be lower in young compared with senescent rats. Splenic conductance increased during heating in young and senescent rats but was highest in young rats. Tail conductance during heating was significantly increased in young rats but remained unchanged in mature and senescent rats. These results demonstrate a marked attenuation in heating-induced vascular conductance changes in senescent rats, suggesting an important functional consequence for the attenuated SND responses to heating in aged rats.
机译:与年轻的Fischer-344(F344)大鼠(Kenney MJ和Fels RJ)相比,衰老对加热的肾和Spannic交感神经发出(SND)对加热的反应显着降低然而,该发现的功能意义尚不清楚。我们测试了血流分布型材在衰老(24莫旧)和年轻(3莫旧)F344大鼠中改变血流分布型材的假设。用放射性核素标记的微球技术(对照,38℃)和在加热期间,在麻醉的F344大鼠中增加体温至41℃的加热期间,测定内脏器官,骨骼肌和尾流。在与年轻F344大鼠加热之前,对肾脏,胃,大肠,胰腺,脾脏和尾部的血管传导显着降低,在衰老中加热前显着降低。加热显着降低肾脏,胃,小而大肠,胰腺血管传导,但成熟而不是衰老F344大鼠。肾脏和小肠中41摄氏度的血管传导显着降低,与衰老大鼠相比,胃中的胃趋于较低。在年轻和衰老大鼠的加热过程中,脾电导增加,但幼鼠中最高。幼鼠在加热过程中的尾电导显着增加,但在成熟和衰老大鼠中保持不变。这些结果表明,衰老大鼠的加热诱导的血管传导变化中显着衰减,这表明减毒对老年大鼠加热的病变反应的重要功能。

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