Results 271 to 280 of about 5,374,393 (318)

Urinary adrenaline and noradrenaline response to simulated weightless state

American Journal of Physiology-Legacy Content, 1964
Sixteen normal subjects were placed in a simulated weightless state, i.e., water immersion. After 6 hr of water immersion, urine samples were collected and bio-assayed for adrenaline and noradrenaline. The excretion of adrenaline was moderately increased ( P < 0.15 > 0.10), possibly related to the anxiety associated with the immersion.
M, GOODALL, M, MCCALLY, D E, GRAVELINE
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Leptin responses to physical inactivity induced by simulated weightlessness

American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2000
Physical inactivity induced by head-down bed rest (HDBR) affects body composition (BC). Leptin is involved in BC regulation by acting on fuel homeostasis. We investigated whether leptin and counterregulatory hormone levels are affected by a 7-day HDBR. Fasting blood was sampled daily (0700) in males ( n = 8) and on alternating days in females ( n = 8)
S, Blanc, S, Normand, C, Pachiaudi, M, Duvareille, C, Gharib   +4 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, 2014
Weightless 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.
De, Chang, Ying-hua, Guo, Chang-ting, Liu   +2 more
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Amino acid supplementation alters bone metabolism during simulated weightlessness

Journal of Applied Physiology, 2005
High-protein and acidogenic diets induce hypercalciuria. Foods or supplements with excess sulfur-containing amino acids increase endogenous sulfuric acid production and therefore have the potential to increase calcium excretion and alter bone metabolism.
S R, Zwart, J E, Davis-Street, D, Paddon-Jones, A A, Ferrando, R R, Wolfe, S M, Smith   +5 more
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Simulated weightlessness for the ontogenesis of the otolith organ

Die Naturwissenschaften, 1968
Abstract : The critical phase of the otolith-organ-ripening within the embryo was used in a simulation experiment by setting frog eggs (Rana temporaria) and toad eggs (Bufo bufo) near the center of a rotating system with a horizontal axis. The experiment speeds were 100 and 160 r.p.m.; the eggs and tadpoles were subjected to maximal centripetal forces ...
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[Adaptation of myocardial function to simulated weightlessness].

Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering, 1998
To observe the changes in myocardial function and calcium ion release of sarcoplasmic reticulum in rats under simulated weightlessness, 24 Sprague-Dawley male rats were divided into control (CON), 8 week tail-suspension (SUS) and recovery for 2 weeks (RE) groups. The results showed that there was no change in resting tension of myocardial twitch in SUS.
Z, Yu, L, Zhang
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Effects of simulated weightlessness on bone properties in rats

Journal of Biomechanics, 1990
Abstract This paper addresses two questions: (1) are reductions in bone apposition rate during disuse due to increased periods of ‘resting’ during bone formation? and (2) are diaphyseal strength changes due to disuse caused by changes in the quality as well as the quantity of the bone matrix?
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Effects of daily 2-Gz load on human cardiovascular function during weightlessness simulation using 4-day head-down bed rest.

Uchu koku kankyo igaku, 1999
T. Sasaki, K. Iwasaki, K. Hirayanagi, N. Yamaguchi, A. Miyamoto, K. Yajima   +5 more
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Integrated regulation in response to simulated weightlessness.

Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering, 1997
To investigate physiological effects of tail suspension, Ca2+ concentration, immune factors, erythrocyte rheological properties, and growth hormone were determined in rats suspended for 15 and 30 d. The results showed that inhibitory changes of both local factors (proteins secreted by bone cell, Ca(2+)-ATPase in sarcoplasmic reticium) and integrated ...
G, Yang, W, Cui, Y, Sun, Q, Dong, X, Shen, T, Wang   +5 more
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[The effect of weightlessness and simulated weightlessness on the expression of genes].

Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering, 2003
The research results of the relationship between gene expression and weightlessness or simulated weightlessness were studied. The influence of weight on the expression of genes in central nervous system were summarized in three aspects. It can be concluded that the expression of genes in central nervous system were precisely regulated by weight. It was
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