不同方向超重作用下(犬)心血管系统反应规律的探讨  

Cardiovascular Reactions to Gravitational Force in Different Directions.

作　　者：薛月英[1] 刘光远[1] 谢宝生[1] 程学尧 王彦昌 

机构地区：[1]航天医学工程研究所,北京100094

出　　处：《航天医学与医学工程》2000年第2期104-108,共5页Space Medicine & Medical Engineering

摘　　要：探讨不同方向超重作用下机体心血管系统的变化规律。方法在动物离心机上将氯醛醣轻度麻醉的狗以不同体位背角暴露到重力作用中。结果随着超重方向由 +Gz向 +Gx方向的改变 ,超重对机体的影响呈现由以头部水平动脉压降低为主向着以中心静脉压升高为主的特点转移 ,机体心血管系统的反应由以动脉系统升压反射为主向着以心脏活动抑制现象为主的方向转移 ,在 75°附近是两者的转折点。结论研究结果对全面认识超重作用下机体心血管系统反应特点具有重要意义 ,对航空航天超重防护座椅背角的合理选择提供了理论参考。Objective To observe the features of the cardiovascular reactions to gravitational forces along different axes of the body. Method Dogs were exposed to gravitational forces along axes of body on an animal centrifuge. Result It was found that when the direction of G force changed from +Gz to +Gx,the predominating effect on the cardiovascular system changed from the drop of eye level blood pressure to the increase of central venous pressure,and the reactions of the organism changed from a presson reflex of the arterial system to the inhibition of cardiac activities at higher G levels. The turning point was found to be at the back angle of 75°with respect to the direction of the gravitational force. Conclusion These findings provide an important reference for choosing the optimal seat back angle in a manned space vehicle.

关 键 词：心血管系统 变化规律 超重保护 座椅背角 航塞 

分 类 号：R852.21[医药卫生—航空、航天与航海医学]