Hypergravity

Hypergravity is defined as the condition where the force of gravity exceeds that on the surface of the earth. This is expressed as being greater than 1 g. Hypergravity conditions are created on earth for research on human physiology in aerial combat and space flight, as well as testing of materials and equipment for space missions.

All of this is of extreme importance because human physiology and materials are used to build planes, spaceships and structures. Which are all accustomed to Earth’s gravity Keerickson (talk) 13:35, 26 April 2012 (UTC)

Recent research carried out on extremophiles in Japan involved a variety of bacteria including Escherichia coli and Paracoccus denitrificans being subject to conditions of extreme gravity. The bacteria were cultivated while being rotated in an ultracentrifuge at high speeds corresponding to 403,627 times "g" (the normal acceleration due to gravity). Paracoccus denitrificans was one of the bacteria which displayed not only survival but also robust cellular growth under these conditions of hyperacceleration which are usually found only in cosmic environments, such as on very massive stars or in the shock waves of supernovas. Analysis showed that the small size of prokaryotic cells is essential for successful growth under hypergravity. The research has implications on the feasibility of existence of exobacteria and panspermia.A concern of this practice is Rapid spinning. If you move your head too quickly while you're inside a fast-moving centrifuge, you might feel uncomfortably like you're tumbling head over heels. This can happen when balance-sensing fluids in the semicircular canals of your inner ear become "confused." Some experiments using centrifuges often include devices that fix the subjects' heads in place, just to prevent that illusion. Traveling through space, however, with your head fixed in place is not practical..

References

http://science.nasa.gov/science-news/science-at-nasa/2003/07feb_stronggravity/