Results 261 to 270 of about 7,105 (317)
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Exercise response to simulated weightlessness
Acta Astronautica, 1979Two bed rest analog studies of space flight were performed; one 14 d and the other 28 d in duration. Exercise response was studied in detail during the 28 d study and following both the 14 d and 28 d studies. This paper relates the results of these studies to physiologic changes noted during and following space flight.
J. A. Rummel, M. C. Buderer, C. F. Sawin
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The Effects of Simulated Weightlessness on Bone Maturation*
Endocrinology, 1987In earlier studies we showed that elevating the hind limbs of growing rats for up to 2 weeks results in a temporary cessation of bone growth in the hind limbs and a transient fall in the serum levels of 1,25-dihydroxyvitamin D. To determine whether such skeletal unloading also retards the maturation of bone, as seen in vitamin D-deprived animals, we ...
Daniel D. Bikle +4 more
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An upper arm model for simulated weightlessness
Acta Physiologica Scandinavica, 2000This investigation examined the effects of 4 weeks of non‐dominant arm unloading on the functional and structural characteristics of the triceps brachii muscle of six normo‐active college‐age males (age: 23 ± 1 years, height: 176 ± 4 cm, weight: 76 ± 6 kg).
David L. Costill +5 more
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Research advance in effects of weightlessness or simulated weightlessness on tumor cells.
Zhongguo yi xue ke xue yuan xue bao. Acta Academiae Medicinae Sinicae, 2012Weightless environment is a rare phenomenon on the ground where the interactions among cells and internal cellular structures disappear or become weakened. Studies on the biological features and molecular expression of tumors cells in weightlessness condition may provide new clues to the tumor initiation, process, diagnosis, and therapy.
Yinghua Guo, Changting Liu, De Chang
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Acta Astronautica, 1988
The investigation of cardiovascular function necessarily involves a consideration of the exchange of substances at the capillary. If cardiovascular function is compromised or in any way altered during exposure to zero gravity in space, then it stands to reason that microvascular function is also modified.
Colleen D. Lynch +5 more
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The investigation of cardiovascular function necessarily involves a consideration of the exchange of substances at the capillary. If cardiovascular function is compromised or in any way altered during exposure to zero gravity in space, then it stands to reason that microvascular function is also modified.
Colleen D. Lynch +5 more
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Study of Temperature Homeostasis in Real and Simulated Weightlessness
Human Physiology, 2002The analysis of the temperature (T) reaction of the body of healthy humans was carried out using the results of investigations with the thermometry technique under antiorthostatic hypokinesia (ANOH) (38 males in the studies of 14- to 49-day duration, eight females, 120 days), isolation in a regenerated gas environment (six males, 90 to 135 days), suit ...
I. M. Larina, N. G. Lakota
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A mathematical and experimental simulation of the hematological response to weightlessness
Acta Astronautica, 1979Two ground-based methods of weightlessness simulation--a computer model of erythropoiesis feedback regulation and bedrest--were used to investigate the mechanisms which lead to loss of red cell mass during spaceflight. Both methods were used to simulate the first Skylab mission of 28 days.
S. L. Kimzey +2 more
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Evaluation of the three-dimensional clinostat as a simulator of weightlessness
Planta, 1997Concerns regarding the reliability of slow-and fast-rotating uni-axial clinostats in simulating weightlessness have induced the construction of devices considered to simulate weightlessness more adequately. A new three-dimensional (3-D) clinostat equipped with two rotation axes placed at right angles has been constructed. In the clinostat, the rotation
Seiichiro Kamisaka +4 more
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Changes of brain response induced by simulated weightlessness
Acta Astronautica, 1992The characteristics change of brain response was studied during 15 degrees head-down tilt (HDT) comparing with 45 degrees head-up tilt (HUT). The brain responses evaluated included the EEG power spectra change at rest and during mental arithmetic, and the event-related potentials (ERPs) of somatosensory, selective attention and mental arithmetic ...
Zhiqiang Guan, Jinhe Wei, Gongdong Yan
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