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  • Title: [Vascular mechanisms of adaptation to head-down tilt body posture].
    Author: Kabesheva TA, Kopanev SV, Panferova NE, Zavadovskiĭ AF.
    Journal: Kosm Biol Aviakosm Med; 1985; 19(2):35-9. PubMed ID: 3990230.
    Abstract:
    Using occlusion plethysmography and rheography, the state of peripheral circulation of 18 test subjects during 25 exposures to head-down tilt was investigated. The test subjects were subdivided into two groups: nine subjects actively changed their body position by 90 degrees and nine others were passively transferred to the head-down position at an angle of -12 degrees. It was found that regular training facilitated the development of vascular mechanisms which assisted adaptation to the head-down tilt: it decreased the tone of resistance vessels of the arms and legs and that of capacitance vessels of the legs; it increased the tone of cerebral resistance and capacitance vessels. The tone of leg capacitance vessels varied, depending on the type of training: passive tilting increased their compliance and active tilting decreased it. The final result of the tone redistribution in the peripheral vascular bed during training was a smaller increase of head blood content and a smaller fluid outflow from the legs.
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