Results 151 to 160 of about 1,152 (181)

PHYSIOLOGICAL ASPECTS OF HYPERGRAVIC AND HYPOGRAVIC STATES

Journal of the American Medical Association, 1960
The 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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Whole-Body but Not Muscle-Level Energetic Cost is Reduced During Simulated Hypogravity Running

Physiology
Maintaining crew health and physical performance during prolonged spaceflight requires effective exercise countermeasures to mitigate the detrimental effects of microgravity on the musculoskeletal and cardiovascular systems. Running exercise represents a
Hannah Yesuf, Lina Yu, Dawson S. Sheehan, Simon Embaye, Christopher Saunders, Danielle Drach, Jared R. Fletcher   +6 more
semanticscholar   +1 more source

An investigation of the single and combined effects of hypogravity and ionizing radiation on brain monoamine metabolism and rats' behavior.

Life sciences and space research, 2019
BACKGROUND Ionizing radiation and hypogravity can cause central nervous system (CNS) dysfunctions. This is a key limiting factor for deep space missions.
V. Kokhan, K. Lebedeva-Georgievskaya, V. Kudrin, A. Bazyan, A. Maltsev, A. Shtemberg   +5 more
semanticscholar   +1 more source

Consideration of the Long-Term Effects of Hypogravity

2021
The 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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Effect of hypogravity on human lymphocyte activation.

Aviation, space, and environmental medicine, 1980
Cultures 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, M, Valluchi-Morf, M, Mueller, W, Briegleb   +3 more
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Research on the adaptation of skeletal muscle to hypogravity: Past and future directions

Advances in Space Research, 1983
Our current understanding of hypogravity-induced atrophy of skeletal muscles is based primarily on studies comparing pre- and post-flight properties of muscles. Interpretations are necessarily qualified by the assumption that the stress of reentry and readjustment to terrestrial gravity do not alter the parameters being analyzed.
D A, Riley, S, Ellis
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The immune system: effects of hypergravity and hypogravity.

Aviation, space, and environmental medicine, 1985
The 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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EFFECTS OF SIMULATED HYPOGRAVITY ON RESPIRATION AND PHOTOSYNTHESIS OF HIGHER PLANTS

1979
Clinostat 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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Light microscopic analysis of the gravireceptor in Xenopus larvae developed in hypogravity

Advances in Space Research, 1989
The paper describes an investigation of the influence of gravity on the early differentiation of gravity receptors in Xenopus embryos and larvae. There is evidence that the expression of crystals in the saccus endolymphaticus was statistically greater when the embryos developed in near weightlessness (hypogravity) than on earth. The function of these
W, Briegleb, J, Neubert, A, Schatz, B, Kruse   +3 more
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Hypogravity increases cyclopiazonic acid sensitivity of rat soleus muscle

Journal of Applied Physiology, 1996
The functional capacity of skeletal muscle sarcoplasmic reticulum was explored in slow rat soleus muscle after 21 days of hindlimb suspension. The sarcoplasmic reticulum function was assessed in intact and saponin-skinned fibers by using cyclopiazonic acid, a specific Ca(2+)-adenosinetriphosphatase inhibitor.
Huchet-Cadiou, C., Bonnet, V., Même, W., Léoty, C   +3 more
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