weightlessness

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weight·less·ness

(wāt'les-nĕs),
The psychophysiologic effect of zero gravity, as experienced by someone falling freely in a vacuum (for example, astronauts in a stable orbit). A temporary state of simulated weightlessness can be achieved during powered flight within the earth's atmosphere by traversing an inverted parabolic curve where gravitational pull and centrifugal force cancel each other out.
Farlex Partner Medical Dictionary © Farlex 2012
A state in which there is no gravitational effect on a body or material
Physiologic effects Bone mineral loss, altered blood chemistries, weakened immune system, variable heart rate, arrhythmias, loss of skeletal and cardiac muscle mass and strength, increased urinary loss of nitrogen and phosphorus, motion sickness, and redistribution of fluids that are normally pooled in the lower torso and legs, resulting in a ‘fat face’
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
References in periodicals archive ?
Most crew members also develop vision problems upon return because of the effects of micro-gravity, which causes pressure to build up in the optic nerve.
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He provides a sketch of what the space tourism industry might look like in the near future, describing such possible activities including brief orbital jaunts, stays in space station hotels, micro-gravity gymnastics, and moon buggy tours.
The picture in the lower middle section is a group our students who have for the last three or four years participated in the Alabama Space Grant Consortium project on micro-gravity research.
The EU/ESA high-level group on space policy met on June 4 for the first time to discuss the various elements of a European space programme (science and space technology, Earth observation, space navigation, satellite telecommunications, space exploration, micro-gravity, launchers and spectrum policy related to space).