Results 181 to 190 of about 38,078 (231)

Visually-induced tilt during parabolic flights

Experimental Brain Research, 1990
A helmet-mounted visual display system was used to study visually induced sensations of self-motion (vection) about the roll, pitch and yaw axes under normal gravity condition (1g) and during the microgravity and hypergravity phases of parabolic flights aboard the NASA KC-135 aircraft.
B S, Cheung, I P, Howard, K E, Money
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Carotid artery pulsatility during parabolic flights

Acta Astronautica, 1995
In cardio-vascular hemodynamic, the arterial pulsatility, represented by the arterial pulse pressure (PP= systolic blood pressure-diastolic blood pressure), is different from one site to another, in opposite with the mean blood pressure almost identical in the whole body in supine position (or in microgravity). This is due to the arterial tree geometry
B M, Pannier, J L, Cuche, A, Benetos, P, Boutouyrie, M E, Safar   +4 more
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Some results from parabolic flights

Advances in Space Research, 1986
Abstract On december 1984 and july 1985 parabolic flights with a KC 135 aircraft of NASA allow to perform preliminary tests on the Benard instability problem which has been proposed to be studied during the D2 mission in the AFPM. On march 1986 the possibility to create a flat interface between two immiscible liquids has been investigated.
Legros, Jean Claude, Limbourg, Marie-Claude, Schwabe, Dietrich, Lichtenbelt, J., Frimout, Dirk   +4 more
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Graviresponses of Paramecium biaurelia during parabolic flights

Protoplasma, 2006
The thresholds of graviorientation and gravikinesis in Paramecium biaurelia were investigated during the 5th DLR (German Aerospace Center) parabolic-flight campaign at Bordeaux in June 2003. Parabolic flights are a useful tool for the investigation of swimming behaviour in protists at different accelerations. At normal gravity (1 g) and hypergravity (1
Krause, Martin, Bräucker, Richard, Hemmersbach, Ruth   +2 more
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Cardiovascular and Valsalva responses during parabolic flight

Journal of Applied Physiology, 1998
We investigated the integrated cardiovascular responses of 15 human subjects to the acute gravitational changes (micro- and hypergravity portions) of parabolic flight. Measurements were made with subjects quietly seated and while subjects performed controlled Valsalva maneuvers.
T T, Schlegel, E W, Benavides, D C, Barker, T E, Brown, D L, Harm, S J, DeSilva, P A, Low   +6 more
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Are aircraft parabolic flights really parabolic?

Acta Astronautica, 2013
Abstract Aircraft parabolic flights provide repetitively short periods of reduced gravity by flying a ballistic trajectory, preceded and followed by periods of acceleration up to 2g. The ballistic part has a shape of an arc of a parabola and is quite commonly referred to as a parabolic flight.
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Parasympathetic heart rate modulation during parabolic flights

European Journal of Applied Physiology, 2003
During parabolic flight short periods of microgravity and hypergravity are created. These changes influence cardiovascular function differently according to posture. During the 29th parabolic flight campaign of the European Space Agency (ESA), the electrocardiogram (ECG) was recorded continuously in seven healthy volunteers in two positions (standing ...
F, Beckers, B, Seps, D, Ramaekers, B, Verheyden, A E, Aubert   +4 more
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Changes in cerebral oxygenation during parabolic flight

European Journal of Applied Physiology, 2013
Assessing changes in brain activity under extreme conditions like weightlessness is a desirable, but difficult undertaking. Results from previous studies report specific changes in brain activity connected to an increase or decrease in gravity forces.
Schneider, S, Abeln, V, Askew, C D, Vogt, T, Hoffmann, U, Denise, P, Struder, H K   +6 more
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Diffusion boundaries behaviour during a parabolic flight

Microgravity - Science and Technology, 2003
The behaviour of a diffusion boundary between distilled water and a 1% sodium chloride solution during a parabolic flight has been observed. The presence of a few percent of Earth gravity pulses during the micro gravity conditions is sufficient to largely perturb the diffusion boundary that stabilises again during the subsequent normal gravity ...
Vitagliano V, Castagnolo D, De Chiara G, Vitagliano PL, De Luca D, Pannico M, Tommasone M, Villani M, Zampino P   +8 more
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Otolith responses in man during parabolic flight

Experimental Brain Research, 1993
The influence of the varying gravito-inertial (Gz) force during parabolic flight on human otolith function was investigated experimentally. It was hypothesised that a varying Gz force profile initiates an otolith-ocular response that manifests itself in modulation of optokinetic nystagmus slow-phase eye velocity (OKN-SPV).
J T, Marcus, A, Kuipers, G F, Smoorenburg   +2 more
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