Results 201 to 210 of about 1,264 (234)

Decision making after 50 days of simulated weightlessness

Brain Research, 2009
By restricting physical activity levels, the bed rest simulation of weightlessness could be associated with changes in prefrontal cortex functioning that manifest as cognitive decrements, particularly for executive cognitive functions. We aimed to determine if performance on an executive function task was indeed affected by bed rest.
Darren M, Lipnicki, Hanns-Christian, Gunga, Daniel L, Belavy, Dieter, Felsenberg   +3 more
openaire   +2 more sources

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
openaire   +2 more sources

Plasma viscosity elevations with simulated weightlessness.

Aviation, space, and environmental medicine, 1986
Bed rest studies which simulate weightlessness have demonstrated marked changes in the state of hydration of subjects as well as decrements in aerobic capacity. These two phenomena may be linked through increases in blood viscosity which is altered by a loss of free water and which, in turn, influences blood flow needed for aerobic muscular work.
D G, Martin, V A, Convertino, D, Goldwater, E W, Ferguson, E B, Schoomaker   +4 more
openaire   +1 more source

RESPONSES OF ROOTS TO SIMULATED WEIGHTLESSNESS ON THE FAST-ROTATING CLINOSTAT

1979
Sedimentable cell particles are distributed randomly along the horizontal axis of the fast-rotating clinostat. They neither sediment in the direction of gravity, nor in the direction of the centrifugal force, nor in the direction of the resultant force of both.
V, Sobick, A, Sievers
openaire   +2 more sources

Simulated weightlessness: effects of bioenergetic balance.

Aviation, space, and environmental medicine, 1980
As a prelude to a flight experiment, an attempt was made to separate energy requirements associated with gravity from all other metabolic needs. The biological effects of weightlessness were simulated by suspending animals in a harness so that antigravity muscles were not supporting the body.
J P, Jordan, H A, Sykes, J C, Crownover, C L, Schatte, J B, Simmons, D P, Jordan   +5 more
openaire   +1 more source

Neuromuscular adaptation to actual and simulated weightlessness.

Advances in space biology and medicine, 1995
The chronic "unloading" of the neuromuscular system during spaceflight has detrimental functional and morphological effects. Changes in the metabolic and mechanical properties of the musculature can be attributed largely to the loss of muscle protein and the alteration in the relative proportion of the proteins in skeletal muscle, particularly in the ...
V R, Edgerton, R R, Roy
openaire   +1 more source

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
openaire   +1 more source

[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
openaire   +1 more source

Cardiac Effects of Repeated Weightlessness During Extreme Duration Swimming Compared With Spaceflight

Circulation, 2021
James P Macnamara, Katrin A Dias, Satyam Sarma   +2 more
exaly  

Antiorthostatic hypokinesia as a method of weightlessness simulation.

Aviation, space, and environmental medicine, 1976
Physiological effects seen in eight test subjects during a 5-d bedrest experiment in the head-down position (0,-4,-8,-12degrees) were studied. It was shown that the antiorthostatic hypokinesia at -12degrees could reproduce physiological responses shown by space crewmembers more closely than recumbent bedrest. Our observations help to stimulate an acute
L I, Kakurin, V I, Lobachik, V M, Mikhailov, Y A, Senkevich   +3 more
openaire   +1 more source