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’

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References in periodicals archive ?

(24) Furthermore, recent spaceflight and long-term head down tilt bed rest studies used to simulate microgravity exposure have likewise demonstrated impairments in diastolic functioning due to inefficiencies with untwisting.

Stress-strain alterations in the myocardium induced by microgravity: a finite element model of the heart

Kearns-Jonker's research will study the aging of neonatal and adult cardiac stem cells in microgravity with the ultimate goal of improving cardiac cell therapy.

NASA, CASIS make space station accessible for stem cell research

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Maintenance of antimicrobial susceptibility of acinetobacter baumannii in modeled microgravity

In conclusion, reversible effect of microgravity is oedema of face, change in taste, abnormal expression of face, teeth pain and xerostomia.

Human oral cavity in simulated microgravity: new prospects

During the experiments aboard the NASA microgravity plane, the Purdue team was able to directly measure cellular signaling events associated with gravity sensing in a model plant cell system, the Ceratopteris fern spore.

Lab-on-a-chip biosensor: studying cells in outer-space-like microgravity

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These experiments were performed on rhesus monkeys and included the chronic invasive recording of hemodynamic signals during simulated microgravity via prolonged head down tilt (HDT).

Effects of simulated microgravity on cardiac viscoelastic parameters in rhesus monkeys

and the Centennial of Flight as well as IS$ A Home in Microgravity--a yearlong event focusing on microgravity aboard the International Space Station.

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Researchers found that during two 1998 space flight missions, exposure to microgravity reduced the number of arousals due to sleep-disordered breathing and virtually eliminated snoring in five healthy subjects (Am.

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