长时间坐着并没有改变内动脉的剪切介导扩张,尽管损害了下肢内皮功能
Shotaro Saito1, Kento Dora1, Marino Karaki2
1Department of Biomedical Engineering, Toyo University, Saitama, Japan.
Physiological reports
|January 29, 2025
概括
长时间坐着会损害外围内皮功能,但大脑内皮功能保持稳定. 这项研究突出了大脑和下肢之间长时间坐着的血管反应的差异.
科学领域:
- 身体生理学 身体生理学
- 血管生物学 血管生物学
- 神经学 神经学
背景情况:
- 大脑内皮功能对于调节大脑血液流动至关重要.
- 众所周知,长时间坐着会对外周血管健康产生负面影响.
- 不断坐着对大脑血管系统的影响尚不清楚.
研究的目的:
- 为了研究4小时连续坐着对大脑内皮功能的影响.
- 为了比较长时间坐着对大脑和外围内皮功能的影响.
主要方法:
- 13名健康的年轻人接受了4小时的连续坐姿.
- 每小时使用双重多普勒超声波评估外周 (民动脉) 和大脑 (内动脉) 内皮功能.
- 流介导扩张是通过高血压 (外周) 和高头 (大脑) 诱导的.
主要成果:
- 坐着2个小时后,外围流介导扩张显著下降,并保持低.
- 内动脉血流,剪切率和流量介导扩张在4小时的坐姿期间没有显著变化.
- 大脑内皮功能保持稳定,与外周内皮功能下降形成鲜明对比.
结论:
- 在健康的年轻人中,连续四小时的坐着会严重损害周围内皮功能,但不会影响大脑内皮功能.
- 与外围血管相比,大脑血管可能对长时间坐着的急性有害影响不那么敏感.
- 这些发现表明,大脑血管系统与下肢血管系统对长时间的久坐行为有着不同的生理反应.
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