Vartbaronov R A, Baranova E V
Kosm Biol Aviakosm Med. 1991 Sep-Oct;25(5):6-8.
The effect of active orthostasis and +Gz acceleration on regional vessels was investigated with the participation of 6 test subjects. Using photoplethysmography, the arterial pulse and venous blood filling of vessels of the finger at the level of the right atrium and at 41 cm above and below it were measured. This corresponded to variations of the intravascular hydrostatic pressure within the range +/- 30 mm Hg. This test was performed before and after exposure to acceleration of 5, 7, 8 and 9 G for 30 s at an onset rate of 1.0 G/s in the horizontal and vertical position. Arterial and venous responses were determined by comparing the results obtained at extreme levels of hydrostatic pressure. In all cases, increase in hydrostatic pressure led to enhancement of arterial tone and venous blood filling. After exposure to acceleration arterial tone and venous blood filling grew to a greater extent, particularly in the horizontal position. It is believed that the above method of measuring responses of regional vessels may prove useful to assess the vascular function after orthostatic, gravitational and other effects.
在6名受试者的参与下，研究了主动直立位和+Gz加速度对局部血管的影响。使用光电容积描记法，测量了右心房水平及其上下41厘米处手指血管的动脉搏动和静脉充血情况。这对应于血管内静水压在+/- 30 mmHg范围内的变化。该测试在水平和垂直位置以1.0 G/s的起始速率暴露于5、7、8和9 G加速度30秒之前和之后进行。通过比较在极端静水压水平下获得的结果来确定动脉和静脉反应。在所有情况下，静水压的增加导致动脉张力和静脉充血增强。暴露于加速度后，动脉张力和静脉充血程度增加得更大，尤其是在水平位置。据信，上述测量局部血管反应的方法可能被证明有助于评估体位性、重力性和其他影响后的血管功能。
