Prolonged Weightlessness

Maintenance of cardiovascular adaptability during prolonged weightlessness.

Weightlessness and skeleton homeostasis.

As human beings venture into space in the 21st century, they will be confronted with a "hypodynamic" and thus hostile environment for the bone homeostasis, that could potentially compromise their mobility in general and skeletal strength in particular after landing. From this point of view, space flight studies are especially interesting and intriguing models for scientists. Space studies, howe...

Physics and psychophysics of weightlessness.

T H E D E V E L O P M E N T of aviation is directed toward ever increasing velocities and altitudes. Already, today, aircraft fly at altitudes at which the density of the atmosphere is extremely low. According to the principles of mechanics, reduction or entire lack of weight will ensue during coasting maneuvers at high altitudes because mechanical support by the atmosphere is lacking/ Conseque...

The Influence of Specific Exercises in the Prevention of Debilitation Musculoskeletal Disorders; Implication in Physiological Conditioning for Prolonged Weightlessness.

T HE IMPORTANCE of regular activity and exercise to normal body function is generally conceded, Normal osteoblastic capacity depends to a large measure upon the stresses of muscular contractions and weight-bearing compression forces. 17, 23, 4L 4< 4r The loss of these stimuli results in insufficient formation of bone matrix, inadequate deposition of calcium salts, and increased porosity of bone...

Effects of Transient Weightlessness on Brightness Discrimination.

Contrast thresholds of six semisupine, visually adapted subjects were obtained under short (10-14 sec.) periods of weightlessness and under 1 G control conditions. The target, viewed binocularly, subtended 1.5 ~ and the background 2.6*. Three background luminance levels were used: 0.03, 0.28 and 30.0 ft-L. The contrast required to detect the target was found to be slightly, but consistently, lo...