长时间的俯卧式卧床改变了人类的同情神经循环调节
Nathaniel J Iannarelli1, Julia E Spafford1, Danielle K Greaves2,3
1Department of Kinesiology, Brock University, St. Catharines, Ontario, Canada.
Journal of applied physiology (Bethesda, Md. : 1985)
|August 11, 2025
概括
长时间的俯卧床对男性和女性的同情性巴罗反射有不同的影响. 在男性中,它降低了血压调节,而女性则表现出增强的血管收缩,以弥补减少的中风体积.
科学领域:
- 心血管生理学心血管生理学
- 自主神经系统功能 自主神经系统功能
- 人类生理学 人类生理学
背景情况:
- 俯卧床 (HDBR) 是微重力暴露的模型,影响心血管调节.
- 同情性巴罗反射对于维持血压平衡至关重要.
- 对HDBR的生理反应的性别差异尚未完全理解.
研究的目的:
- 为了研究60天头向下卧床对同情性巴罗反射的性别特异性影响.
- 确定HDBR如何改变交感神经活动 (MSNA) 以及其对血压的转导.
- 为了检查女性在HDBR后的模拟静止期间的补偿机制.
主要方法:
- 利用微神经图来测量集成肌肉交感神经活动 (MSNA).
- 采用信号平均值来量化平均动脉压 (MAP) 和总周围阻力 (TPR) 的交感转导.
- 评估了13名男性和12名女性在60天的-6° HDBR前后的反应,包括女性的下体负压 (LBNP).
主要成果:
- 在男性但不是女性中,HDBR减弱的MSNA爆发转导到MAP.
- 在两性中都没有观察到基线MSNA的显著变化.
- 在女性中,HDBR在LBNP期间降低了中风体积并增加了TPR,在-45mmHg时增加了TPR的交感转导.
结论:
- 生物性别显著影响HDBR对交感巴罗反射功能的影响.
- 雌性在HDBR后的模拟静止期间表现出对同情活动增强的血管收缩反应,可能会补偿减少的中风体积.
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