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We are interested in, from any other causes, in addition to these, may depend orthostatic stability circulation. Recall first of all that it is one of the most "young" in the evolutionary respect of property circulation, and the evolutionary young properties and structures are usually the least durable, easily vulnerable. So, if the body is free from the usual and necessary daily anti-gravity training, it quickly loses ortostaticeski. Enough to lie week in bed, to have symptoms of instability of blood circulation to the orthostasis. It feels dizzy when first standing up from the bed.
When the astronaut gets in conditions of weightlessness, the same mechanisms of redistribution of blood flow, which helped on Earth to resist the force of gravity becomes an enemy of the blood, of course, now circulates mainly in the upper half of the body, because the tone of the bottom whole life was higher and the weightlessness has destroyed the concept of "up" and "down". The brain, as always, quite successfully protected from such attacks; but, watching TV transmissions from space, you will notice that person astronauts swollen. In order to offset the effect of gravity, it is replaced by the decompression of the lower half of the body (TNT), with a reasonable degree of rarefaction of the air "at the bottom", with short and infrequent sessions. Yet after the flight orthostatic stability circulation is largely lost, and to restore, you need quite a long workout. Always destroy anything easier than to re-create. Before the first flight of man into space first feared large accelerations during launch and landing; weightlessness thought quite calmly, although psychologists have already dealt with the issue of prevention of the consequences of extraterrestrial, orbital life. It turned out that weightlessness carries more risks than acceleration, because neutragena antigravity mechanisms lead to their reduction. That's why it's a dangerous life in the bed-couch potato can be seriously ill, "orthostatic unstable", and only a long workout, you may heal him. Just training - stand without support. But sedentary person squanders and ability to propulsion, power activities. So you need to add to the vertical position and physical activity.
People who work sitting down, antigravity devices are not in full force, so people training is important. A sitting position is the so - called partial orthostasis.
Reflectory-segmental antigravity blood redistribution is implemented sympathetic centrifugal nerves of the vessels. Mouse whose chemical way prevented the development of the sympathetic nervous system (they had less than 10 % of vasomotor neurons) were almost totally unable to resist orthostatic effects: it was enough to secure the mouse's tail to its hind feet did not touch support, and rodents quickly died. This is also evidenced by the monitoring of neurologists: in patients with a break of the spinal cord (i.e., sympathetic axons primarily) orthostatic stability circulation is lost completely.
We studied orthostatic stability circulation in many Moscow girls of various ages and in adult women.
All Schoolgirls were healthy, i.e., no complaining, and clinically they have not revealed any diseases. Nevertheless, part of a contingent circulation was lost ground during orthostasis. Surprising but all of these girls were above average growth (for his age). In children and girls-or medium-growth harbingers of collapse were rare exceptions. Hence, the hydrostatic blood pressure exerted on the walls of capacitive veins of the legs,is the main factor orthostatic instability circulation under other equal conditions. We'll note that the growth - value, genetically determined with great accuracy, although growth affects the endocrine sphere, in this case, too, probably genetically fixed.
As with other endocrine factors, some imbalance antigravity mechanisms calls in the female body puberty; after that require two years that the circulation has adapted to the new conditions of the internal environment of the organism, and resistance to gravity is getting better again. But when the opposite phenomenon - age extinction of women's sexual functions and related endocrine rebuilding - ortostaticeski circulation does not suffer, although health is often poor. The role of growth in any case was dominant (in terms of "normal" way of life), and it, undoubtedly, testifies to the importance of tone veins in orthostatic stability of the circulatory system. Many physiologists consider the role veins insignificant and passive; however, not less and our supporters in this matter.

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