Cardiovascular Implications of Space Tumbling: Conditioning, Training, and Protection

摘要

Cardiovascular deconditioning occurs as a result of exposure to zero-gravity. Whereas cardiovascular deconditioning produced by water immersion can be prevented by pressure cuffs, and that produced by bed rest can be prevented by passive exercise, such measures are not effective against deconditioning due to space flight. The author suggests certain experiments to study response to tumbling by the conditioned cardiovascular system and by the deconditioned system. The theoretic pressure input resulting from human centrifugation is graphically represented. Tumbling is considered the 'short-radius' spectrum of centrifugation. The concept of the hydrostatic indifference point is discussed in the light of the marked curvature of the pressure profile when the center of rotation is very near one end of the body and the parabolic form of the pressure curve when the center of rotation is within the body. (Author)