Results 211 to 220 of about 17,476 (253)

Altered thermoregulatory responses after 15 days of head-down tilt

Journal of Applied Physiology, 1994
To determine whether extended exposure to a simulation of microgravity alters thermoregulatory reflex control of skin blood flow, six adult males (mean age 40 +/- 2 yr) were exposed to 15 days of 6 degrees head-down tilt (HDT). On an ambulatory control day before HDT exposure and on HDT day 15, the core temperature of each subject was increased by 0.5–
C G, Crandall, J M, Johnson, V A, Convertino, P B, Raven, K A, Engelke   +4 more
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Head-down tilt and restraint on renal function and glomerular dynamics in the rat

Journal of Applied Physiology, 1987
A model utilizing 25 degree head-down tilt (HDT) and incorporated with chronic catheterization and renal micropuncture techniques in rats was employed to study alterations in renal function induced by HDT. Renal function and extracellular volume measurements were performed after 24 h, 4 days, and 7 days of HDT in conscious rats and compared with their
B J, Tucker, C A, Mundy, M G, Ziegler, C, Baylis, R C, Blantz   +4 more
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Choroidal readaptation to gravity in rats after spaceflight and head-down tilt

Journal of Applied Physiology, 1998
Davet, Julien, Benoit Clavel, Lucien Datas, Laurence Mani-Ponset, Daniel Maurel, Serge Herbuté, Michel Viso, William Hinds, Joellen Jarvi, and Jacqueline Gabrion.Choroidal readaptation to gravity in rats after spaceflight and head-down tilt. J. Appl. Physiol.84(1): 19–29, 1998.—To determine when choroidal structures were restored after readaptation to ...
J, Davet, B, Clavel, L, Datas, L, Mani-Ponset, D, Maurel, S, Herbuté, M, Viso, W, Hinds, J, Jarvi, J, Gabrion   +9 more
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Influence of posture and prolonged head-down tilt on cardiovascular reflexes.

Acta physiologica Scandinavica. Supplementum, 1992
We investigated the influence of ten days 6 degrees head-down tilt (HDT) on short-term cardiovascular control. To help differentiate between the effects of HDT-induced fluid redistribution and changed autonomic cardiovascular modulation under prolonged HDT, the effect of acute posture changes was investigated as well.
Ten Harkel, A. D. J. (1), Beck, L., Karemaker, J. M. (1)   +2 more
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Effects of head-down tilt for 10 days on the compliance of the leg.

Acta physiologica Scandinavica. Supplementum, 1992
The purpose of this investigation was to measure lower leg compliance before, during and after a 10-day period of bedrest at head-down tilt to test the hypothesis that leg compliance and the capacity for venous pooling is increased by the adaptation to stimulated microgravity.
Buckey, J. C., Lane, L. D., Plath, G., Gaffney, F. A., Baisch, F., Blomqvist, C. G.   +5 more
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The effect of head-down tilt on brain potentials related to visual attention

Acta Astronautica, 1995
To study the possible effect of simulated weightlessness on brain function state, the brain event-related potentials (ERPs) in a simple visual selective response task were compared between HDT and HUT in 9 normal subjects. The results were: The Target(T) and non-Target(NT) flash signals both induced significant slow positive potentials which were ...
J, Wei, G, Yan, L, Zhao, R, Duan, F, Xiao, D, Li, J, Wu   +6 more
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Cardiorespiratory responses to head down tilt

01.05 - Clinical respiratory physiology, exercise and functional imaging, 2022
A Alsharifi, A Irampaye, N Carter, J Steier, G Rafferty   +4 more
openaire   +1 more source

Dynamic cerebral autoregulation is preserved during acute head-down tilt

Journal of Applied Physiology, 2003
Complete ganglion blockade alters dynamic cerebral autoregulation, suggesting links between systemic autonomic traffic and regulation of cerebral blood flow velocity. We tested the hypothesis that acute head-down tilt, a physiological maneuver that decreases systemic sympathetic activity, would similarly disrupt normal dynamic cerebral autoregulation.
William H, Cooke, Guy L, Pellegrini, Olga A, Kovalenko   +2 more
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Acute Effects of Head‐Down Tilt and Hypoxia on Modulators of Fluid Homeostasis

The Journal of Clinical Pharmacology, 1994
In an effort to understand the interaction between acute postural fluid shifts and hypoxia on hormonal regulation of fluid homeostasis, the authors measured the responses to head‐down tilt with and without acute exposure to normobaric hypoxia. Plasma atrial natriuretic peptide (ANP), cyclic guanosine monophosphate (cGMP), cyclic adenosine monophosphate
P A, Whitson, N M, Cintron, R A, Pietrzyk, P, Scotto, J A, Loeppky   +4 more
openaire   +2 more sources

Effects of head-down tilt on fluid and electrolyte balance.

Aviation, space, and environmental medicine, 1976
The metabolic effects of -5degrees tilt were studied in eight normal individuals. Exposure to tilt for 24 h increased solution excretion and decreased plasma volume. Plasma renin activity and plasma aldosterone levels were not significantly different from supine values during the first 6 h of tilting, but were increased significantly at the end of the ...
L, Volicer, R, Jean-Charles, A V, Chobanian   +2 more
openaire   +1 more source