在患有慢性病的老鼠中,运动压力反射功能的增强.
Han-Kyul Kim1,2, Juan A Estrada2, Ayumi Fukazawa2
1Department of Internal Medicine-Cardiology Division, UT Southwestern Medical Center, Dallas, Texas, United States.
概括
运动压力反射 (EPR) 在慢性病 (CKD) 中被夸大. 这种加剧的反应涉及同情性过度激活以及在CKD中增强的机械反射和代谢反射功能.
科学领域:
- 生理学 生理学 生理学
- 腎臟病學 (nephrology) 是一種醫學專業.
- 心血管科学 心血管科学
背景情况:
- 慢性病 (CKD) 患者对运动的心血管反应往往被夸大.
- 增强的同情激活,可能由来自收缩肌肉的运动压力反射 (EPR) 介导,与这种现象有关.
- 以前的人类研究表明,CKD中存在过度活跃的EPR,但实验限制阻碍了充分阐明.
研究的目的:
- 在经过验证的慢性病 (CKD) 动物模型中专门测试运动压力反射 (EPR) 的功能.
主要方法:
- 雄性Sprague-Dawley大鼠被食含有0.25%的腺因的饮食以诱导CKD或控制饮食.
- 在去脑,未经麻醉的动物中,评估了对EPR激活的平均动脉压 (MAP) 和交感神经活动 (RSNA) 的反应.
- 评估了EPR的功能组成部分,包括机械反射 (被动肌肉拉伸) 和代谢反射 (动脉内素).
主要成果:
- 与对照组相比,CKD大鼠的血肌素水平显著更高.
- 在CKD大鼠中,MAP和RSNA对肌肉收缩 (EPR激活) 的反应都被增强.
- 对于被动肌肉伸展 (机械反射) 和动脉内素 (代谢反射) 的反应也在CKD动物中显著增加.
结论:
- 运动压力反射 (EPR),包括其机械反射和代谢反射组成部分,在慢性病 (CKD) 的老鼠模型中被夸大了.
- 这种夸张的EPR有助于增加压力反应和在CKD肌肉收缩期间的同情性过度激活.
- 研究结果表明,在CKD的背景下,增强了EPR,机械反射和代谢反射功能.
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