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1G gravity environment evolution and life of the structure and function of the human physiological systems have to adapt to a 1G gravity environment . When the astronauts into space , gravity environment changes , the obvious change of the physiological systems of the human body , will cause long - term living in a weightless environment . Orthostatic syncope is characterized by tachycardia , hypotension , and occasional standing reduce common problems of space flight , on almost all of the astronauts have an impact . The mechanism may involve a variety of factors , such as lower extremity venous compliance changes , changes in arterial structure and function , changes in cardiac function , decreased blood volume , body fluids to reduce the endocrine system changes , you can not explain to a single factor . Wherein the function of the cardiovascular system and the changes in the structure may be one of the main factors . However, the current study is mainly directed against the cardiac function and arterial vein as the main factors affecting the blood volume and stroke volume reduced orthostatic tolerance is unclear . Orthostatic tolerance lower cardiovascular system dysfunction after weight loss mainly affect the astronauts return to the ground operation reentry emergency the ability to leave the ship , and the ability to adapt again on the ground 1G environment . Thus , research to reduce the occurrence of effective counter measures to prevent orthostatic tolerance aerospace medical profession . Currently used in spaceflight countermeasures , including exercise , nutritional supplements , Body Negative Pressure Penguin Suit , but not yet a way to completely prevent orthostatic intolerance drop
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