Results 91 to 100 of about 403 (130)
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Skipping vs. running as the bipedal gait of choice in hypogravity
Journal of Applied Physiology, 2015Hypogravity challenges bipedal locomotion in its common forms. However, as previously theoretically and empirically suggested, humans can rely on “skipping,” a less common gait available as a functional analog (perhaps a vestigium) of quadrupedal gallop, to confidently move when gravity is much lower than on Earth.
G. Pavei, C.M. Biancardi, A.E. Minetti
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Effect of physical fitness and training on physiological responses to hypogravity
Acta Astronautica, 1981The studies on the orthostatic tolerance during the hypodynamics exposure seem to be significant in connection with the selection, training and health maintenance of astronauts. Using male human subjects of various physical fitness levels, fluctuations of their physical fitness through 2 weeks of vigorous athletic training were measured in many ...
H, Saiki +7 more
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The effect of hypogravity and hypergravity on cells of the immune system
Journal of Leukocyte Biology, 1993Abstract This article reviews the gravity effects discovered in T lymphocytes and other cells of the immune system. The strong depression of mitogenic activation first observed in an experiment conducted in Spacelab 1 in 1983 triggered several other investigations in space and on the ground in the clinostat and in the centrifuge in the ...
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A Case Study of Human Roll Tilt Perception in Hypogravity
Aerospace Medicine and Human Performance, 2017BACKGROUND: Increased gravito-inertial acceleration, or hypergravity, such as produced in a centrifuge or in an aircraft coordinated turn, causes humans to systematically overestimate their roll tilt in the dark. This is known as the “G-excess” illusion.
Torin K, Clark, Laurence R, Young
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Consideration of the Long-Term Effects of Hypogravity
2021The effects of long-term reduced (lunar) gravity are very much unknown. The Apollo Program represents our only experience with humans in extended lunar gravity. Those exposures were brief, but few if any major medical issues were encountered that cannot be ascribed to issues other than reduced gravity.
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PHYSIOLOGICAL ASPECTS OF HYPERGRAVIC AND HYPOGRAVIC STATES
Journal of the American Medical Association, 1960The planning of a circumterrestial orbiting space flight of a human passenger includes a mission profile to accommodate the inherent structural limitations of the passenger and life-supporting subsystems. During launching, reentry, and recovery phases of a man-missile flight, the man will be in gravitational environments with which he is not familiar ...
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Evaluation of External Cardiac Massage Performance During Hypogravity Simulation
2006 International Conference of the IEEE Engineering in Medicine and Biology Society, 2006Preservation of astronaut crew health during an exploration mission to the Moon or Mars will be crucial to mission success. The likelihood of a life-threatening medical condition occuring during a mission to Mars has been estimated by NASA to be 1% per year (Johnston, 1998; Johnston, Campbell, Billica, & Gilmore, 2004).
Gustavo Dalmarco +7 more
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EFFECTS OF SIMULATED HYPOGRAVITY ON RESPIRATION AND PHOTOSYNTHESIS OF HIGHER PLANTS
1979Clinostat rotation about a horizontal axis mechanically cancels the directional component of the gravity force vector which is biologically sensed by plants. However, efficiency of clinostats as simulators of weightlessness for prolonged periods has not been demonstrated conclusively.
C H, Ward, J M, King
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Effect of hypogravity on human lymphocyte activation.
Aviation, space, and environmental medicine, 1980Cultures of human lymphocytes were exposed to the mitogen concanavalin A in a low-G environment generated by a fast rotating clinostat. DNA-synthesis was determined by incorporation of 3H-thymidine as the parameter for activation, cell ultrastructure was analyzed by electron microscopy, and cell movements were recorded by a cinecamera. The results were
A, Cogoli +3 more
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The immune system: effects of hypergravity and hypogravity.
Aviation, space, and environmental medicine, 1985The force of gravity has been inescapable until only the last few decades. Space programs conducted by several nations now make possible the study of hypergravity and hypogravity in a variety of scientific areas. Although much work has focused on the physiological aspects of gravity, its effects on the immune system are only beginning to be appreciated.
R P, Barone, L D, Caren
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