For over 30 yr, men and women have lived for various periods of time in a weightless (or free-fall) environment while orbiting the Earth. During these years, we have learned that humans function quite well for short periods of weightlessness, that is, for up to a little more than a year. Some space flight missions have provided physiologic data, including cardiovascular data, from the spacefarers. In fact, some missions have provided laboratories for systematic study of cardiovascular responses and adaptation to space flight. However, the opportunity to obtain physiologic data from people in space is a rarity. It is important to remember that the population sample sizes are small, other stresses may confound the effects of weightlessness, and in some situations the crewmembers are subjects for several experiments at the same time. Furthermore, comparison of cardiovascular data from space flight to data obtained on the ground is sometimes difficult because the subject's posture on the ground is not always reported; in a gravity environment, posture influences the hydrostatic gradient. This over view describes what we have learned about cardiovascular function during flight and after return to Earth.
Space research activities during missions of the past
Medicine and science in sports and exercise ; 28 , 10 Suppl
1996-10-01
Sonstige
Keine Angabe
Englisch
Life Sciences (General) , NASA Discipline Number 99-99 , NASA Program Flight , STS Shuttle Project , NASA Discipline Number 00-00 , Flight Experiment , unmanned , Cosmos Project , Skylab Project , manned , NASA Discipline Cardiopulmonary , long duration , NASA Program Life Sciences Management , short duration , NASA Center HQS
Space research activities during missions of the past
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